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[73.202.60.99]) by smtp.googlemail.com with ESMTPSA id o27sm2979055pgm.1.2022.01.09.04.30.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Jan 2022 04:30:10 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH v1 1/5] x86: Optimize strcmp-avx2.S and fix for [BZ# 28755] Date: Sun, 9 Jan 2022 06:29:43 -0600 Message-Id: <20220109122946.2754917-1-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Spam-Status: No, score=-10.4 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SCC_10_SHORT_WORD_LINES, SCC_20_SHORT_WORD_LINES, SCC_5_SHORT_WORD_LINES, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Noah Goldstein via Libc-alpha From: Noah Goldstein Reply-To: Noah Goldstein Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Fixes [BZ# 28755] for wcsncmp by redirecting length >= 2^56 to __wcscmp_avx2. For x86_64 this covers the entire address range so any length larger could not possibly be used to bound `s1` or `s2`. Optimization are primarily to the loop logic and how the page cross logic interacts with the loop. The page cross logic is at times more expensive for short strings near the end of a page but not crossing the page. This is done to retest the page cross conditions with a non-faulty check and to improve the logic for entering the loop afterwards. This is only particular cases, however, and is general made up for by more than 10x improvements on the transition from the page cross -> loop case. The non-page cross cases are improved most for smaller sizes [0, 128] and go about even for (128, 4096]. The loop page cross logic is improved so some more significant speedup is seen there as well. test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass. Signed-off-by: Noah Goldstein --- Numbers attached in reply. Numbers are geometric mean of N=20 runs. Numbers where collected on: https://ark.intel.com/content/www/us/en/ark/products/208921/intel-core-i71165g7-processor-12m-cache-up-to-4-70-ghz-with-ipu.html The 'score' column is (time current) / (time new). The "greener" the number the the larger the improvement. The "redder" the larger the regression. Some notes on the numbers: There are three cases of regressions: 1. Small values at the page cross case. The regression is because the new logic spends extra logic checking if the page cross was a false positive and setting up the logic to transition to the loop case more smoothly. I don't see any way around this and on the flip side of the regressions is 500% speedups in either the false positive case or contuation. 2. Cases where the string barely crosses the page. The regression is because the current logic does a single byte loop on exit which is ultimately a faster check for very small strings. The flip side of this is 20000% speedups. I think the logic that has us implement strncmp with vectors also supports replacing the one at a time byte loop for something that scales better. 3. The avx2 case for [128, 512] is within [-5%, +5%]. There are some regressions here. I am unsure what exacting why this is the case. In general I am less happy with the quality of the avx2 implementation and believe it still needs some work. I still think its an improvement because of the gains in the [0, 128] case, many of the page cross cases and the [513, inf] cases but if people think otherwise it may be best to skip the patch. Note the patch is also for [BZ# 28755] although a seperate fix for that will be simple enough. Aside from the 3 regressions there are mostly modest improvements then some dramatic improvements where the one at a time byte loops where eliminated. sysdeps/x86_64/multiarch/strcmp-avx2.S | 1586 ++++++++++++++---------- 1 file changed, 942 insertions(+), 644 deletions(-) diff --git a/sysdeps/x86_64/multiarch/strcmp-avx2.S b/sysdeps/x86_64/multiarch/strcmp-avx2.S index a45f9d2749..28d6a0025a 100644 --- a/sysdeps/x86_64/multiarch/strcmp-avx2.S +++ b/sysdeps/x86_64/multiarch/strcmp-avx2.S @@ -26,35 +26,57 @@ # define PAGE_SIZE 4096 -/* VEC_SIZE = Number of bytes in a ymm register */ + /* VEC_SIZE = Number of bytes in a ymm register. */ # define VEC_SIZE 32 -/* Shift for dividing by (VEC_SIZE * 4). */ -# define DIVIDE_BY_VEC_4_SHIFT 7 -# if (VEC_SIZE * 4) != (1 << DIVIDE_BY_VEC_4_SHIFT) -# error (VEC_SIZE * 4) != (1 << DIVIDE_BY_VEC_4_SHIFT) -# endif +# define VMOVU vmovdqu +# define VMOVA vmovdqa # ifdef USE_AS_WCSCMP -/* Compare packed dwords. */ + /* Compare packed dwords. */ # define VPCMPEQ vpcmpeqd -/* Compare packed dwords and store minimum. */ + /* Compare packed dwords and store minimum. */ # define VPMINU vpminud -/* 1 dword char == 4 bytes. */ + /* 1 dword char == 4 bytes. */ # define SIZE_OF_CHAR 4 # else -/* Compare packed bytes. */ + /* Compare packed bytes. */ # define VPCMPEQ vpcmpeqb -/* Compare packed bytes and store minimum. */ + /* Compare packed bytes and store minimum. */ # define VPMINU vpminub -/* 1 byte char == 1 byte. */ + /* 1 byte char == 1 byte. */ # define SIZE_OF_CHAR 1 # endif +# ifdef USE_AS_STRNCMP +# define LOOP_REG r9d +# define LOOP_REG64 r9 + +# define OFFSET_REG8 r9b +# define OFFSET_REG r9d +# define OFFSET_REG64 r9 +# else +# define LOOP_REG edx +# define LOOP_REG64 rdx + +# define OFFSET_REG8 dl +# define OFFSET_REG edx +# define OFFSET_REG64 rdx +# endif + # ifndef VZEROUPPER # define VZEROUPPER vzeroupper # endif +# if defined USE_AS_STRNCMP +# define VEC_OFFSET 0 +# else +# define VEC_OFFSET (-VEC_SIZE) +# endif + +# define xmmZERO xmm15 +# define ymmZERO ymm15 + # ifndef SECTION # define SECTION(p) p##.avx # endif @@ -79,773 +101,1049 @@ the maximum offset is reached before a difference is found, zero is returned. */ - .section SECTION(.text),"ax",@progbits -ENTRY (STRCMP) + .section SECTION(.text), "ax", @progbits +ENTRY(STRCMP) # ifdef USE_AS_STRNCMP - /* Check for simple cases (0 or 1) in offset. */ +# ifdef __ILP32__ + /* Clear the upper 32 bits. */ + movl %edx, %rdx +# endif cmp $1, %RDX_LP - je L(char0) - jb L(zero) + /* Signed comparison intentional. We use this branch to also + test cases where length >= 2^63. These very large sizes can be + handled with strcmp as there is no way for that length to + actually bound the buffer. */ + jle L(one_or_less) # ifdef USE_AS_WCSCMP - /* Convert units: from wide to byte char. */ - shl $2, %RDX_LP + movq %rdx, %rcx + + /* Multiplying length by sizeof(wchar_t) can result in overflow. + Check if that is possible. All cases where overflow are possible + are cases where length is large enough that it can never be a + bound on valid memory so just use wcscmp. */ + shrq $56, %rcx + jnz __wcscmp_avx2 + + leaq (, %rdx, 4), %rdx # endif - /* Register %r11 tracks the maximum offset. */ - mov %RDX_LP, %R11_LP # endif + vpxor %xmmZERO, %xmmZERO, %xmmZERO movl %edi, %eax - xorl %edx, %edx - /* Make %xmm7 (%ymm7) all zeros in this function. */ - vpxor %xmm7, %xmm7, %xmm7 orl %esi, %eax - andl $(PAGE_SIZE - 1), %eax - cmpl $(PAGE_SIZE - (VEC_SIZE * 4)), %eax - jg L(cross_page) - /* Start comparing 4 vectors. */ - vmovdqu (%rdi), %ymm1 - VPCMPEQ (%rsi), %ymm1, %ymm0 - VPMINU %ymm1, %ymm0, %ymm0 - VPCMPEQ %ymm7, %ymm0, %ymm0 - vpmovmskb %ymm0, %ecx - testl %ecx, %ecx - je L(next_3_vectors) - tzcntl %ecx, %edx + sall $20, %eax + /* Check if s1 or s2 may cross a page in next 4x VEC loads. */ + cmpl $((PAGE_SIZE -(VEC_SIZE * 4)) << 20), %eax + ja L(page_cross) + +L(no_page_cross): + /* Safe to compare 4x vectors. */ + VMOVU (%rdi), %ymm0 + /* 1s where s1 and s2 equal. */ + VPCMPEQ (%rsi), %ymm0, %ymm1 + /* 1s at null CHAR. */ + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + /* 1s where s1 and s2 equal AND not null CHAR. */ + vpandn %ymm1, %ymm2, %ymm1 + + /* All 1s -> keep going, any 0s -> return. */ + vpmovmskb %ymm1, %ecx # ifdef USE_AS_STRNCMP - /* Return 0 if the mismatched index (%rdx) is after the maximum - offset (%r11). */ - cmpq %r11, %rdx - jae L(zero) + cmpq $VEC_SIZE, %rdx + jbe L(vec_0_test_len) # endif + + /* All 1s represents all equals. incl will overflow to zero in + all equals case. Otherwise 1s will carry until position of first + mismatch. */ + incl %ecx + jz L(more_3x_vec) + + .p2align 4,, 4 +L(return_vec_0): + tzcntl %ecx, %ecx # ifdef USE_AS_WCSCMP + movl (%rdi, %rcx), %edx xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - je L(return) -L(wcscmp_return): + cmpl (%rsi, %rcx), %edx + je L(ret0) setl %al negl %eax orl $1, %eax -L(return): # else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax + movzbl (%rdi, %rcx), %eax + movzbl (%rsi, %rcx), %ecx + subl %ecx, %eax # endif +L(ret0): L(return_vzeroupper): ZERO_UPPER_VEC_REGISTERS_RETURN - .p2align 4 -L(return_vec_size): - tzcntl %ecx, %edx # ifdef USE_AS_STRNCMP - /* Return 0 if the mismatched index (%rdx + VEC_SIZE) is after - the maximum offset (%r11). */ - addq $VEC_SIZE, %rdx - cmpq %r11, %rdx - jae L(zero) -# ifdef USE_AS_WCSCMP + .p2align 4,, 8 +L(vec_0_test_len): + notl %ecx + bzhil %edx, %ecx, %eax + jnz L(return_vec_0) + /* Align if will cross fetch block. */ + .p2align 4,, 2 +L(ret_zero): xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - jne L(wcscmp_return) -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax -# endif -# else + VZEROUPPER_RETURN + + .p2align 4,, 5 +L(one_or_less): + jb L(ret_zero) # ifdef USE_AS_WCSCMP + /* 'nbe' covers the case where length is negative (large + unsigned). */ + jnbe __wcscmp_avx2 + movl (%rdi), %edx xorl %eax, %eax - movl VEC_SIZE(%rdi, %rdx), %ecx - cmpl VEC_SIZE(%rsi, %rdx), %ecx - jne L(wcscmp_return) + cmpl (%rsi), %edx + je L(ret1) + setl %al + negl %eax + orl $1, %eax # else - movzbl VEC_SIZE(%rdi, %rdx), %eax - movzbl VEC_SIZE(%rsi, %rdx), %edx - subl %edx, %eax + /* 'nbe' covers the case where length is negative (large + unsigned). */ + + jnbe __strcmp_avx2 + movzbl (%rdi), %eax + movzbl (%rsi), %ecx + subl %ecx, %eax # endif +L(ret1): + ret # endif - VZEROUPPER_RETURN - .p2align 4 -L(return_2_vec_size): - tzcntl %ecx, %edx + .p2align 4,, 10 +L(return_vec_1): + tzcntl %ecx, %ecx # ifdef USE_AS_STRNCMP - /* Return 0 if the mismatched index (%rdx + 2 * VEC_SIZE) is - after the maximum offset (%r11). */ - addq $(VEC_SIZE * 2), %rdx - cmpq %r11, %rdx - jae L(zero) -# ifdef USE_AS_WCSCMP + /* rdx must be > CHAR_PER_VEC so save to subtract w.o fear of + overflow. */ + addq $-VEC_SIZE, %rdx + cmpq %rcx, %rdx + jbe L(ret_zero) +# endif +# ifdef USE_AS_WCSCMP + movl VEC_SIZE(%rdi, %rcx), %edx xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - jne L(wcscmp_return) -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax -# endif + cmpl VEC_SIZE(%rsi, %rcx), %edx + je L(ret2) + setl %al + negl %eax + orl $1, %eax # else -# ifdef USE_AS_WCSCMP - xorl %eax, %eax - movl (VEC_SIZE * 2)(%rdi, %rdx), %ecx - cmpl (VEC_SIZE * 2)(%rsi, %rdx), %ecx - jne L(wcscmp_return) -# else - movzbl (VEC_SIZE * 2)(%rdi, %rdx), %eax - movzbl (VEC_SIZE * 2)(%rsi, %rdx), %edx - subl %edx, %eax -# endif + movzbl VEC_SIZE(%rdi, %rcx), %eax + movzbl VEC_SIZE(%rsi, %rcx), %ecx + subl %ecx, %eax # endif +L(ret2): VZEROUPPER_RETURN - .p2align 4 -L(return_3_vec_size): - tzcntl %ecx, %edx + .p2align 4,, 10 # ifdef USE_AS_STRNCMP - /* Return 0 if the mismatched index (%rdx + 3 * VEC_SIZE) is - after the maximum offset (%r11). */ - addq $(VEC_SIZE * 3), %rdx - cmpq %r11, %rdx - jae L(zero) -# ifdef USE_AS_WCSCMP +L(return_vec_3): + salq $32, %rcx +# endif + +L(return_vec_2): +# ifndef USE_AS_STRNCMP + tzcntl %ecx, %ecx +# else + tzcntq %rcx, %rcx + cmpq %rcx, %rdx + jbe L(ret_zero) +# endif + +# ifdef USE_AS_WCSCMP + movl (VEC_SIZE * 2)(%rdi, %rcx), %edx xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - jne L(wcscmp_return) -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax -# endif + cmpl (VEC_SIZE * 2)(%rsi, %rcx), %edx + je L(ret3) + setl %al + negl %eax + orl $1, %eax # else + movzbl (VEC_SIZE * 2)(%rdi, %rcx), %eax + movzbl (VEC_SIZE * 2)(%rsi, %rcx), %ecx + subl %ecx, %eax +# endif +L(ret3): + VZEROUPPER_RETURN + +# ifndef USE_AS_STRNCMP + .p2align 4,, 10 +L(return_vec_3): + tzcntl %ecx, %ecx # ifdef USE_AS_WCSCMP + movl (VEC_SIZE * 3)(%rdi, %rcx), %edx xorl %eax, %eax - movl (VEC_SIZE * 3)(%rdi, %rdx), %ecx - cmpl (VEC_SIZE * 3)(%rsi, %rdx), %ecx - jne L(wcscmp_return) + cmpl (VEC_SIZE * 3)(%rsi, %rcx), %edx + je L(ret4) + setl %al + negl %eax + orl $1, %eax # else - movzbl (VEC_SIZE * 3)(%rdi, %rdx), %eax - movzbl (VEC_SIZE * 3)(%rsi, %rdx), %edx - subl %edx, %eax + movzbl (VEC_SIZE * 3)(%rdi, %rcx), %eax + movzbl (VEC_SIZE * 3)(%rsi, %rcx), %ecx + subl %ecx, %eax # endif -# endif +L(ret4): VZEROUPPER_RETURN +# endif + + .p2align 4,, 10 +L(more_3x_vec): + /* Safe to compare 4x vectors. */ + VMOVU VEC_SIZE(%rdi), %ymm0 + VPCMPEQ VEC_SIZE(%rsi), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + incl %ecx + jnz L(return_vec_1) + +# ifdef USE_AS_STRNCMP + subq $(VEC_SIZE * 2), %rdx + jbe L(ret_zero) +# endif + + VMOVU (VEC_SIZE * 2)(%rdi), %ymm0 + VPCMPEQ (VEC_SIZE * 2)(%rsi), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + incl %ecx + jnz L(return_vec_2) + + VMOVU (VEC_SIZE * 3)(%rdi), %ymm0 + VPCMPEQ (VEC_SIZE * 3)(%rsi), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + incl %ecx + jnz L(return_vec_3) - .p2align 4 -L(next_3_vectors): - vmovdqu VEC_SIZE(%rdi), %ymm6 - VPCMPEQ VEC_SIZE(%rsi), %ymm6, %ymm3 - VPMINU %ymm6, %ymm3, %ymm3 - VPCMPEQ %ymm7, %ymm3, %ymm3 - vpmovmskb %ymm3, %ecx - testl %ecx, %ecx - jne L(return_vec_size) - vmovdqu (VEC_SIZE * 2)(%rdi), %ymm5 - vmovdqu (VEC_SIZE * 3)(%rdi), %ymm4 - vmovdqu (VEC_SIZE * 3)(%rsi), %ymm0 - VPCMPEQ (VEC_SIZE * 2)(%rsi), %ymm5, %ymm2 - VPMINU %ymm5, %ymm2, %ymm2 - VPCMPEQ %ymm4, %ymm0, %ymm0 - VPCMPEQ %ymm7, %ymm2, %ymm2 - vpmovmskb %ymm2, %ecx - testl %ecx, %ecx - jne L(return_2_vec_size) - VPMINU %ymm4, %ymm0, %ymm0 - VPCMPEQ %ymm7, %ymm0, %ymm0 - vpmovmskb %ymm0, %ecx - testl %ecx, %ecx - jne L(return_3_vec_size) -L(main_loop_header): - leaq (VEC_SIZE * 4)(%rdi), %rdx - movl $PAGE_SIZE, %ecx - /* Align load via RAX. */ - andq $-(VEC_SIZE * 4), %rdx - subq %rdi, %rdx - leaq (%rdi, %rdx), %rax # ifdef USE_AS_STRNCMP - /* Starting from this point, the maximum offset, or simply the - 'offset', DECREASES by the same amount when base pointers are - moved forward. Return 0 when: - 1) On match: offset <= the matched vector index. - 2) On mistmach, offset is before the mistmatched index. + cmpq $(VEC_SIZE * 2), %rdx + jbe L(ret_zero) +# endif + +# ifdef USE_AS_WCSCMP + /* any non-zero positive value that doesn't inference with 0x1. */ - subq %rdx, %r11 - jbe L(zero) -# endif - addq %rsi, %rdx - movq %rdx, %rsi - andl $(PAGE_SIZE - 1), %esi - /* Number of bytes before page crossing. */ - subq %rsi, %rcx - /* Number of VEC_SIZE * 4 blocks before page crossing. */ - shrq $DIVIDE_BY_VEC_4_SHIFT, %rcx - /* ESI: Number of VEC_SIZE * 4 blocks before page crossing. */ - movl %ecx, %esi - jmp L(loop_start) + movl $2, %r8d +# else + xorl %r8d, %r8d +# endif + + /* The prepare labels are various entry points from the page + cross logic. */ +L(prepare_loop): + +# ifdef USE_AS_STRNCMP + /* Store N + (VEC_SIZE * 4) and place check at the begining of + the loop. */ + leaq (VEC_SIZE * 2)(%rdi, %rdx), %rdx +# endif +L(prepare_loop_no_len): + + /* Align s1 and adjust s2 accordingly. */ + subq %rdi, %rsi + andq $-(VEC_SIZE * 4), %rdi + addq %rdi, %rsi + +# ifdef USE_AS_STRNCMP + subq %rdi, %rdx +# endif + +L(prepare_loop_aligned): + /* eax stores distance from rsi to next page cross. These cases + need to be handled specially as the 4x loop could potentially + read memory past the length of s1 or s2 and across a page + boundary. */ + movl $-(VEC_SIZE * 4), %eax + subl %esi, %eax + andl $(PAGE_SIZE - 1), %eax + + /* Loop 4x comparisons at a time. */ .p2align 4 L(loop): + + /* End condition for strncmp. */ # ifdef USE_AS_STRNCMP - /* Base pointers are moved forward by 4 * VEC_SIZE. Decrease - the maximum offset (%r11) by the same amount. */ - subq $(VEC_SIZE * 4), %r11 - jbe L(zero) -# endif - addq $(VEC_SIZE * 4), %rax - addq $(VEC_SIZE * 4), %rdx -L(loop_start): - testl %esi, %esi - leal -1(%esi), %esi - je L(loop_cross_page) -L(back_to_loop): - /* Main loop, comparing 4 vectors are a time. */ - vmovdqa (%rax), %ymm0 - vmovdqa VEC_SIZE(%rax), %ymm3 - VPCMPEQ (%rdx), %ymm0, %ymm4 - VPCMPEQ VEC_SIZE(%rdx), %ymm3, %ymm1 - VPMINU %ymm0, %ymm4, %ymm4 - VPMINU %ymm3, %ymm1, %ymm1 - vmovdqa (VEC_SIZE * 2)(%rax), %ymm2 - VPMINU %ymm1, %ymm4, %ymm0 - vmovdqa (VEC_SIZE * 3)(%rax), %ymm3 - VPCMPEQ (VEC_SIZE * 2)(%rdx), %ymm2, %ymm5 - VPCMPEQ (VEC_SIZE * 3)(%rdx), %ymm3, %ymm6 - VPMINU %ymm2, %ymm5, %ymm5 - VPMINU %ymm3, %ymm6, %ymm6 - VPMINU %ymm5, %ymm0, %ymm0 - VPMINU %ymm6, %ymm0, %ymm0 - VPCMPEQ %ymm7, %ymm0, %ymm0 - - /* Test each mask (32 bits) individually because for VEC_SIZE - == 32 is not possible to OR the four masks and keep all bits - in a 64-bit integer register, differing from SSE2 strcmp - where ORing is possible. */ - vpmovmskb %ymm0, %ecx + subq $(VEC_SIZE * 4), %rdx + jbe L(ret_zero) +# endif + + subq $-(VEC_SIZE * 4), %rdi + subq $-(VEC_SIZE * 4), %rsi + + /* Check if rsi loads will cross a page boundary. */ + addl $-(VEC_SIZE * 4), %eax + jnb L(page_cross_during_loop) + + /* Loop entry after handling page cross during loop. */ +L(loop_skip_page_cross_check): + VMOVA (VEC_SIZE * 0)(%rdi), %ymm0 + VMOVA (VEC_SIZE * 1)(%rdi), %ymm2 + VMOVA (VEC_SIZE * 2)(%rdi), %ymm4 + VMOVA (VEC_SIZE * 3)(%rdi), %ymm6 + + /* ymm1 all 1s where s1 and s2 equal. All 0s otherwise. */ + VPCMPEQ (VEC_SIZE * 0)(%rsi), %ymm0, %ymm1 + + VPCMPEQ (VEC_SIZE * 1)(%rsi), %ymm2, %ymm3 + VPCMPEQ (VEC_SIZE * 2)(%rsi), %ymm4, %ymm5 + VPCMPEQ (VEC_SIZE * 3)(%rsi), %ymm6, %ymm7 + + + /* If any mismatches or null CHAR then 0 CHAR, otherwise non- + zero. */ + vpand %ymm0, %ymm1, %ymm1 + + + vpand %ymm2, %ymm3, %ymm3 + vpand %ymm4, %ymm5, %ymm5 + vpand %ymm6, %ymm7, %ymm7 + + VPMINU %ymm1, %ymm3, %ymm3 + VPMINU %ymm5, %ymm7, %ymm7 + + /* Reduce all 0 CHARs for the 4x VEC into ymm7. */ + VPMINU %ymm3, %ymm7, %ymm7 + + /* If any 0 CHAR then done. */ + VPCMPEQ %ymm7, %ymmZERO, %ymm7 + vpmovmskb %ymm7, %LOOP_REG + testl %LOOP_REG, %LOOP_REG + jz L(loop) + + /* Find which VEC has the mismatch of end of string. */ + VPCMPEQ %ymm1, %ymmZERO, %ymm1 + vpmovmskb %ymm1, %ecx testl %ecx, %ecx - je L(loop) - VPCMPEQ %ymm7, %ymm4, %ymm0 - vpmovmskb %ymm0, %edi - testl %edi, %edi - je L(test_vec) - tzcntl %edi, %ecx + jnz L(return_vec_0_end) + + + VPCMPEQ %ymm3, %ymmZERO, %ymm3 + vpmovmskb %ymm3, %ecx + testl %ecx, %ecx + jnz L(return_vec_1_end) + +L(return_vec_2_3_end): # ifdef USE_AS_STRNCMP - cmpq %rcx, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi + subq $(VEC_SIZE * 2), %rdx + jbe L(ret_zero_end) +# endif + + VPCMPEQ %ymm5, %ymmZERO, %ymm5 + vpmovmskb %ymm5, %ecx + testl %ecx, %ecx + jnz L(return_vec_2_end) + + /* LOOP_REG contains matches for null/mismatch from the loop. If + VEC 0,1,and 2 all have no null and no mismatches then mismatch + must entirely be from VEC 3 which is fully represented by + LOOP_REG. */ + tzcntl %LOOP_REG, %LOOP_REG + +# ifdef USE_AS_STRNCMP + subl $-(VEC_SIZE), %LOOP_REG + cmpq %LOOP_REG64, %rdx + jbe L(ret_zero_end) +# endif + +# ifdef USE_AS_WCSCMP + movl (VEC_SIZE * 2 - VEC_OFFSET)(%rdi, %LOOP_REG64), %ecx xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif + cmpl (VEC_SIZE * 2 - VEC_OFFSET)(%rsi, %LOOP_REG64), %ecx + je L(ret5) + setl %al + negl %eax + xorl %r8d, %eax # else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif + movzbl (VEC_SIZE * 2 - VEC_OFFSET)(%rdi, %LOOP_REG64), %eax + movzbl (VEC_SIZE * 2 - VEC_OFFSET)(%rsi, %LOOP_REG64), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret5): VZEROUPPER_RETURN - .p2align 4 -L(test_vec): # ifdef USE_AS_STRNCMP - /* The first vector matched. Return 0 if the maximum offset - (%r11) <= VEC_SIZE. */ - cmpq $VEC_SIZE, %r11 - jbe L(zero) + .p2align 4,, 2 +L(ret_zero_end): + xorl %eax, %eax + VZEROUPPER_RETURN # endif - VPCMPEQ %ymm7, %ymm1, %ymm1 - vpmovmskb %ymm1, %ecx - testl %ecx, %ecx - je L(test_2_vec) - tzcntl %ecx, %edi + + + /* The L(return_vec_N_end) differ from L(return_vec_N) in that + they use the value of `r8` to negate the return value. This is + because the page cross logic can swap `rdi` and `rsi`. */ + .p2align 4,, 10 # ifdef USE_AS_STRNCMP - addq $VEC_SIZE, %rdi - cmpq %rdi, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi +L(return_vec_1_end): + salq $32, %rcx +# endif +L(return_vec_0_end): +# ifndef USE_AS_STRNCMP + tzcntl %ecx, %ecx +# else + tzcntq %rcx, %rcx + cmpq %rcx, %rdx + jbe L(ret_zero_end) +# endif + +# ifdef USE_AS_WCSCMP + movl (%rdi, %rcx), %edx xorl %eax, %eax - movl (%rsi, %rdi), %ecx - cmpl (%rdx, %rdi), %ecx - jne L(wcscmp_return) -# else - movzbl (%rax, %rdi), %eax - movzbl (%rdx, %rdi), %edx - subl %edx, %eax -# endif + cmpl (%rsi, %rcx), %edx + je L(ret6) + setl %al + negl %eax + xorl %r8d, %eax # else + movzbl (%rdi, %rcx), %eax + movzbl (%rsi, %rcx), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax +# endif +L(ret6): + VZEROUPPER_RETURN + +# ifndef USE_AS_STRNCMP + .p2align 4,, 10 +L(return_vec_1_end): + tzcntl %ecx, %ecx # ifdef USE_AS_WCSCMP - movq %rax, %rsi + movl VEC_SIZE(%rdi, %rcx), %edx xorl %eax, %eax - movl VEC_SIZE(%rsi, %rdi), %ecx - cmpl VEC_SIZE(%rdx, %rdi), %ecx - jne L(wcscmp_return) + cmpl VEC_SIZE(%rsi, %rcx), %edx + je L(ret7) + setl %al + negl %eax + xorl %r8d, %eax # else - movzbl VEC_SIZE(%rax, %rdi), %eax - movzbl VEC_SIZE(%rdx, %rdi), %edx - subl %edx, %eax + movzbl VEC_SIZE(%rdi, %rcx), %eax + movzbl VEC_SIZE(%rsi, %rcx), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif -# endif +L(ret7): VZEROUPPER_RETURN +# endif - .p2align 4 -L(test_2_vec): + .p2align 4,, 10 +L(return_vec_2_end): + tzcntl %ecx, %ecx # ifdef USE_AS_STRNCMP - /* The first 2 vectors matched. Return 0 if the maximum offset - (%r11) <= 2 * VEC_SIZE. */ - cmpq $(VEC_SIZE * 2), %r11 - jbe L(zero) + cmpq %rcx, %rdx + jbe L(ret_zero_page_cross) # endif - VPCMPEQ %ymm7, %ymm5, %ymm5 - vpmovmskb %ymm5, %ecx - testl %ecx, %ecx - je L(test_3_vec) - tzcntl %ecx, %edi -# ifdef USE_AS_STRNCMP - addq $(VEC_SIZE * 2), %rdi - cmpq %rdi, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi +# ifdef USE_AS_WCSCMP + movl (VEC_SIZE * 2)(%rdi, %rcx), %edx xorl %eax, %eax - movl (%rsi, %rdi), %ecx - cmpl (%rdx, %rdi), %ecx - jne L(wcscmp_return) -# else - movzbl (%rax, %rdi), %eax - movzbl (%rdx, %rdi), %edx - subl %edx, %eax -# endif + cmpl (VEC_SIZE * 2)(%rsi, %rcx), %edx + je L(ret11) + setl %al + negl %eax + xorl %r8d, %eax # else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (VEC_SIZE * 2)(%rsi, %rdi), %ecx - cmpl (VEC_SIZE * 2)(%rdx, %rdi), %ecx - jne L(wcscmp_return) -# else - movzbl (VEC_SIZE * 2)(%rax, %rdi), %eax - movzbl (VEC_SIZE * 2)(%rdx, %rdi), %edx - subl %edx, %eax -# endif + movzbl (VEC_SIZE * 2)(%rdi, %rcx), %eax + movzbl (VEC_SIZE * 2)(%rsi, %rcx), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret11): VZEROUPPER_RETURN - .p2align 4 -L(test_3_vec): + + /* Page cross in rsi in next 4x VEC. */ + + /* TODO: Improve logic here. */ + .p2align 4,, 10 +L(page_cross_during_loop): + /* eax contains [distance_from_page - (VEC_SIZE * 4)]. */ + + /* Optimistically rsi and rdi and both aligned inwhich case we + don't need any logic here. */ + cmpl $-(VEC_SIZE * 4), %eax + /* Don't adjust eax before jumping back to loop and we will + never hit page cross case again. */ + je L(loop_skip_page_cross_check) + + /* Check if we can safely load a VEC. */ + cmpl $-(VEC_SIZE * 3), %eax + jle L(less_1x_vec_till_page_cross) + + VMOVA (%rdi), %ymm0 + VPCMPEQ (%rsi), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + incl %ecx + jnz L(return_vec_0_end) + + /* if distance >= 2x VEC then eax > -(VEC_SIZE * 2). */ + cmpl $-(VEC_SIZE * 2), %eax + jg L(more_2x_vec_till_page_cross) + + .p2align 4,, 4 +L(less_1x_vec_till_page_cross): + subl $-(VEC_SIZE * 4), %eax + /* Guranteed safe to read from rdi - VEC_SIZE here. The only + concerning case is first iteration if incoming s1 was near start + of a page and s2 near end. If s1 was near the start of the page + we already aligned up to nearest VEC_SIZE * 4 so gurnateed safe + to read back -VEC_SIZE. If rdi is truly at the start of a page + here, it means the previous page (rdi - VEC_SIZE) has already + been loaded earlier so must be valid. */ + VMOVU -VEC_SIZE(%rdi, %rax), %ymm0 + VPCMPEQ -VEC_SIZE(%rsi, %rax), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + + /* Mask of potentially valid bits. The lower bits can be out of + range comparisons (but safe regarding page crosses). */ + movl $-1, %r10d + shlxl %esi, %r10d, %r10d + notl %ecx + # ifdef USE_AS_STRNCMP - /* The first 3 vectors matched. Return 0 if the maximum offset - (%r11) <= 3 * VEC_SIZE. */ - cmpq $(VEC_SIZE * 3), %r11 - jbe L(zero) -# endif - VPCMPEQ %ymm7, %ymm6, %ymm6 - vpmovmskb %ymm6, %esi - tzcntl %esi, %ecx + cmpq %rax, %rdx + jbe L(return_page_cross_end_check) +# endif + movl %eax, %OFFSET_REG + addl $(PAGE_SIZE - VEC_SIZE * 4), %eax + + andl %r10d, %ecx + jz L(loop_skip_page_cross_check) + + .p2align 4,, 3 +L(return_page_cross_end): + tzcntl %ecx, %ecx + # ifdef USE_AS_STRNCMP - addq $(VEC_SIZE * 3), %rcx - cmpq %rcx, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (%rsi, %rcx), %esi - cmpl (%rdx, %rcx), %esi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif + leal -VEC_SIZE(%OFFSET_REG64, %rcx), %ecx +L(return_page_cross_cmp_mem): # else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi + addl %OFFSET_REG, %ecx +# endif +# ifdef USE_AS_WCSCMP + movl VEC_OFFSET(%rdi, %rcx), %edx xorl %eax, %eax - movl (VEC_SIZE * 3)(%rsi, %rcx), %esi - cmpl (VEC_SIZE * 3)(%rdx, %rcx), %esi - jne L(wcscmp_return) -# else - movzbl (VEC_SIZE * 3)(%rax, %rcx), %eax - movzbl (VEC_SIZE * 3)(%rdx, %rcx), %edx - subl %edx, %eax -# endif + cmpl VEC_OFFSET(%rsi, %rcx), %edx + je L(ret8) + setl %al + negl %eax + xorl %r8d, %eax +# else + movzbl VEC_OFFSET(%rdi, %rcx), %eax + movzbl VEC_OFFSET(%rsi, %rcx), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret8): VZEROUPPER_RETURN - .p2align 4 -L(loop_cross_page): - xorl %r10d, %r10d - movq %rdx, %rcx - /* Align load via RDX. We load the extra ECX bytes which should - be ignored. */ - andl $((VEC_SIZE * 4) - 1), %ecx - /* R10 is -RCX. */ - subq %rcx, %r10 - - /* This works only if VEC_SIZE * 2 == 64. */ -# if (VEC_SIZE * 2) != 64 -# error (VEC_SIZE * 2) != 64 -# endif - - /* Check if the first VEC_SIZE * 2 bytes should be ignored. */ - cmpl $(VEC_SIZE * 2), %ecx - jge L(loop_cross_page_2_vec) - - vmovdqu (%rax, %r10), %ymm2 - vmovdqu VEC_SIZE(%rax, %r10), %ymm3 - VPCMPEQ (%rdx, %r10), %ymm2, %ymm0 - VPCMPEQ VEC_SIZE(%rdx, %r10), %ymm3, %ymm1 - VPMINU %ymm2, %ymm0, %ymm0 - VPMINU %ymm3, %ymm1, %ymm1 - VPCMPEQ %ymm7, %ymm0, %ymm0 - VPCMPEQ %ymm7, %ymm1, %ymm1 - - vpmovmskb %ymm0, %edi - vpmovmskb %ymm1, %esi - - salq $32, %rsi - xorq %rsi, %rdi - - /* Since ECX < VEC_SIZE * 2, simply skip the first ECX bytes. */ - shrq %cl, %rdi - - testq %rdi, %rdi - je L(loop_cross_page_2_vec) - tzcntq %rdi, %rcx # ifdef USE_AS_STRNCMP - cmpq %rcx, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi + .p2align 4,, 10 +L(return_page_cross_end_check): + tzcntl %ecx, %ecx + leal -VEC_SIZE(%rax, %rcx), %ecx + cmpl %ecx, %edx + ja L(return_page_cross_cmp_mem) xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif -# else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif -# endif VZEROUPPER_RETURN +# endif - .p2align 4 -L(loop_cross_page_2_vec): - /* The first VEC_SIZE * 2 bytes match or are ignored. */ - vmovdqu (VEC_SIZE * 2)(%rax, %r10), %ymm2 - vmovdqu (VEC_SIZE * 3)(%rax, %r10), %ymm3 - VPCMPEQ (VEC_SIZE * 2)(%rdx, %r10), %ymm2, %ymm5 - VPMINU %ymm2, %ymm5, %ymm5 - VPCMPEQ (VEC_SIZE * 3)(%rdx, %r10), %ymm3, %ymm6 - VPCMPEQ %ymm7, %ymm5, %ymm5 - VPMINU %ymm3, %ymm6, %ymm6 - VPCMPEQ %ymm7, %ymm6, %ymm6 - - vpmovmskb %ymm5, %edi - vpmovmskb %ymm6, %esi - - salq $32, %rsi - xorq %rsi, %rdi - xorl %r8d, %r8d - /* If ECX > VEC_SIZE * 2, skip ECX - (VEC_SIZE * 2) bytes. */ - subl $(VEC_SIZE * 2), %ecx - jle 1f - /* Skip ECX bytes. */ - shrq %cl, %rdi - /* R8 has number of bytes skipped. */ - movl %ecx, %r8d -1: - /* Before jumping back to the loop, set ESI to the number of - VEC_SIZE * 4 blocks before page crossing. */ - movl $(PAGE_SIZE / (VEC_SIZE * 4) - 1), %esi - - testq %rdi, %rdi + .p2align 4,, 10 +L(more_2x_vec_till_page_cross): + /* If more 2x vec till cross we will complete a full loop + iteration here. */ + + VMOVU VEC_SIZE(%rdi), %ymm0 + VPCMPEQ VEC_SIZE(%rsi), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + incl %ecx + jnz L(return_vec_1_end) + # ifdef USE_AS_STRNCMP - /* At this point, if %rdi value is 0, it already tested - VEC_SIZE*4+%r10 byte starting from %rax. This label - checks whether strncmp maximum offset reached or not. */ - je L(string_nbyte_offset_check) -# else - je L(back_to_loop) + cmpq $(VEC_SIZE * 2), %rdx + jbe L(ret_zero_in_loop_page_cross) # endif - tzcntq %rdi, %rcx - addq %r10, %rcx - /* Adjust for number of bytes skipped. */ - addq %r8, %rcx + + subl $-(VEC_SIZE * 4), %eax + + /* Safe to include comparisons from lower bytes. */ + VMOVU -(VEC_SIZE * 2)(%rdi, %rax), %ymm0 + VPCMPEQ -(VEC_SIZE * 2)(%rsi, %rax), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + incl %ecx + jnz L(return_vec_page_cross_0) + + VMOVU -(VEC_SIZE * 1)(%rdi, %rax), %ymm0 + VPCMPEQ -(VEC_SIZE * 1)(%rsi, %rax), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + incl %ecx + jnz L(return_vec_page_cross_1) + # ifdef USE_AS_STRNCMP - addq $(VEC_SIZE * 2), %rcx - subq %rcx, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi + /* Must check length here as length might proclude reading next + page. */ + cmpq %rax, %rdx + jbe L(ret_zero_in_loop_page_cross) +# endif + + /* Finish the loop. */ + VMOVA (VEC_SIZE * 2)(%rdi), %ymm4 + VMOVA (VEC_SIZE * 3)(%rdi), %ymm6 + + VPCMPEQ (VEC_SIZE * 2)(%rsi), %ymm4, %ymm5 + VPCMPEQ (VEC_SIZE * 3)(%rsi), %ymm6, %ymm7 + vpand %ymm4, %ymm5, %ymm5 + vpand %ymm6, %ymm7, %ymm7 + VPMINU %ymm5, %ymm7, %ymm7 + VPCMPEQ %ymm7, %ymmZERO, %ymm7 + vpmovmskb %ymm7, %LOOP_REG + testl %LOOP_REG, %LOOP_REG + jnz L(return_vec_2_3_end) + + /* Best for code size to include ucond-jmp here. Would be faster + if this case is hot to duplicate the L(return_vec_2_3_end) code + as fall-through and have jump back to loop on mismatch + comparison. */ + subq $-(VEC_SIZE * 4), %rdi + subq $-(VEC_SIZE * 4), %rsi + addl $(PAGE_SIZE - VEC_SIZE * 8), %eax +# ifdef USE_AS_STRNCMP + subq $(VEC_SIZE * 4), %rdx + ja L(loop_skip_page_cross_check) +L(ret_zero_in_loop_page_cross): xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif + VZEROUPPER_RETURN # else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (VEC_SIZE * 2)(%rsi, %rcx), %edi - cmpl (VEC_SIZE * 2)(%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (VEC_SIZE * 2)(%rax, %rcx), %eax - movzbl (VEC_SIZE * 2)(%rdx, %rcx), %edx - subl %edx, %eax -# endif + jmp L(loop_skip_page_cross_check) # endif - VZEROUPPER_RETURN + + .p2align 4,, 10 +L(return_vec_page_cross_0): + addl $-VEC_SIZE, %eax +L(return_vec_page_cross_1): + tzcntl %ecx, %ecx # ifdef USE_AS_STRNCMP -L(string_nbyte_offset_check): - leaq (VEC_SIZE * 4)(%r10), %r10 - cmpq %r10, %r11 - jbe L(zero) - jmp L(back_to_loop) + leal -VEC_SIZE(%rax, %rcx), %ecx + cmpq %rcx, %rdx + jbe L(ret_zero_in_loop_page_cross) +# else + addl %eax, %ecx # endif - .p2align 4 -L(cross_page_loop): - /* Check one byte/dword at a time. */ # ifdef USE_AS_WCSCMP - cmpl %ecx, %eax + movl VEC_OFFSET(%rdi, %rcx), %edx + xorl %eax, %eax + cmpl VEC_OFFSET(%rsi, %rcx), %edx + je L(ret9) + setl %al + negl %eax + xorl %r8d, %eax # else + movzbl VEC_OFFSET(%rdi, %rcx), %eax + movzbl VEC_OFFSET(%rsi, %rcx), %ecx subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif - jne L(different) - addl $SIZE_OF_CHAR, %edx - cmpl $(VEC_SIZE * 4), %edx - je L(main_loop_header) -# ifdef USE_AS_STRNCMP - cmpq %r11, %rdx - jae L(zero) +L(ret9): + VZEROUPPER_RETURN + + + .p2align 4,, 10 +L(page_cross): +# ifndef USE_AS_STRNCMP + /* If both are VEC aligned we don't need any special logic here. + Only valid for strcmp where stop condition is guranteed to be + reachable by just reading memory. */ + testl $((VEC_SIZE - 1) << 20), %eax + jz L(no_page_cross) # endif + + movl %edi, %eax + movl %esi, %ecx + andl $(PAGE_SIZE - 1), %eax + andl $(PAGE_SIZE - 1), %ecx + + xorl %OFFSET_REG, %OFFSET_REG + + /* Check which is closer to page cross, s1 or s2. */ + cmpl %eax, %ecx + jg L(page_cross_s2) + + /* The previous page cross check has false positives. Check for + true positive as page cross logic is very expensive. */ + subl $(PAGE_SIZE - VEC_SIZE * 4), %eax + jbe L(no_page_cross) + + /* Set r8 to not interfere with normal return value (rdi and rsi + did not swap). */ # ifdef USE_AS_WCSCMP - movl (%rdi, %rdx), %eax - movl (%rsi, %rdx), %ecx + /* any non-zero positive value that doesn't inference with 0x1. + */ + movl $2, %r8d # else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %ecx + xorl %r8d, %r8d # endif - /* Check null char. */ - testl %eax, %eax - jne L(cross_page_loop) - /* Since %eax == 0, subtract is OK for both SIGNED and UNSIGNED - comparisons. */ - subl %ecx, %eax -# ifndef USE_AS_WCSCMP -L(different): + + /* Check if less than 1x VEC till page cross. */ + subl $(VEC_SIZE * 3), %eax + jg L(less_1x_vec_till_page) + + /* If more than 1x VEC till page cross, loop throuh safely + loadable memory until within 1x VEC of page cross. */ + + .p2align 4,, 10 +L(page_cross_loop): + + VMOVU (%rdi, %OFFSET_REG64), %ymm0 + VPCMPEQ (%rsi, %OFFSET_REG64), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + incl %ecx + + jnz L(check_ret_vec_page_cross) + addl $VEC_SIZE, %OFFSET_REG +# ifdef USE_AS_STRNCMP + cmpq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross) # endif - VZEROUPPER_RETURN + addl $VEC_SIZE, %eax + jl L(page_cross_loop) + + subl %eax, %OFFSET_REG + /* OFFSET_REG has distance to page cross - VEC_SIZE. Guranteed + to not cross page so is safe to load. Since we have already + loaded at least 1 VEC from rsi it is also guranteed to be safe. + */ + + VMOVU (%rdi, %OFFSET_REG64), %ymm0 + VPCMPEQ (%rsi, %OFFSET_REG64), %ymm0, %ymm1 + VPCMPEQ %ymm0, %ymmZERO, %ymm2 + vpandn %ymm1, %ymm2, %ymm1 + vpmovmskb %ymm1, %ecx + +# ifdef USE_AS_STRNCMP + leal VEC_SIZE(%OFFSET_REG64), %eax + cmpq %rax, %rdx + jbe L(check_ret_vec_page_cross2) + addq %rdi, %rdx +# endif + incl %ecx + jz L(prepare_loop_no_len) + .p2align 4,, 4 +L(ret_vec_page_cross): +# ifndef USE_AS_STRNCMP +L(check_ret_vec_page_cross): +# endif + tzcntl %ecx, %ecx + addl %OFFSET_REG, %ecx +L(ret_vec_page_cross_cont): # ifdef USE_AS_WCSCMP - .p2align 4 -L(different): - /* Use movl to avoid modifying EFLAGS. */ - movl $0, %eax + movl (%rdi, %rcx), %edx + xorl %eax, %eax + cmpl (%rsi, %rcx), %edx + je L(ret12) setl %al negl %eax - orl $1, %eax - VZEROUPPER_RETURN + xorl %r8d, %eax +# else + movzbl (%rdi, %rcx), %eax + movzbl (%rsi, %rcx), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret12): + VZEROUPPER_RETURN # ifdef USE_AS_STRNCMP - .p2align 4 -L(zero): + .p2align 4,, 10 +L(check_ret_vec_page_cross2): + incl %ecx +L(check_ret_vec_page_cross): + tzcntl %ecx, %ecx + addl %OFFSET_REG, %ecx + cmpq %rcx, %rdx + ja L(ret_vec_page_cross_cont) + .p2align 4,, 2 +L(ret_zero_page_cross): xorl %eax, %eax VZEROUPPER_RETURN +# endif - .p2align 4 -L(char0): -# ifdef USE_AS_WCSCMP - xorl %eax, %eax - movl (%rdi), %ecx - cmpl (%rsi), %ecx - jne L(wcscmp_return) -# else - movzbl (%rsi), %ecx - movzbl (%rdi), %eax - subl %ecx, %eax -# endif - VZEROUPPER_RETURN + .p2align 4,, 4 +L(page_cross_s2): + /* Ensure this is a true page cross. */ + subl $(PAGE_SIZE - VEC_SIZE * 4), %ecx + jbe L(no_page_cross) + + + movl %ecx, %eax + movq %rdi, %rcx + movq %rsi, %rdi + movq %rcx, %rsi + + /* set r8 to negate return value as rdi and rsi swapped. */ +# ifdef USE_AS_WCSCMP + movl $-4, %r8d +# else + movl $-1, %r8d # endif + xorl %OFFSET_REG, %OFFSET_REG - .p2align 4 -L(last_vector): - addq %rdx, %rdi - addq %rdx, %rsi + /* Check if more than 1x VEC till page cross. */ + subl $(VEC_SIZE * 3), %eax + jle L(page_cross_loop) + + .p2align 4,, 6 +L(less_1x_vec_till_page): + /* Find largest load size we can use. */ + cmpl $16, %eax + ja L(less_16_till_page) + + VMOVU (%rdi), %xmm0 + VPCMPEQ (%rsi), %xmm0, %xmm1 + VPCMPEQ %xmm0, %xmmZERO, %xmm2 + vpandn %xmm1, %xmm2, %xmm1 + vpmovmskb %ymm1, %ecx + incw %cx + jnz L(check_ret_vec_page_cross) + movl $16, %OFFSET_REG # ifdef USE_AS_STRNCMP - subq %rdx, %r11 + cmpq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross_slow_case0) + subl %eax, %OFFSET_REG +# else + /* Explicit check for 16 byte alignment. */ + subl %eax, %OFFSET_REG + jz L(prepare_loop) # endif - tzcntl %ecx, %edx + + VMOVU (%rdi, %OFFSET_REG64), %xmm0 + VPCMPEQ (%rsi, %OFFSET_REG64), %xmm0, %xmm1 + VPCMPEQ %xmm0, %xmmZERO, %xmm2 + vpandn %xmm1, %xmm2, %xmm1 + vpmovmskb %ymm1, %ecx + incw %cx + jnz L(check_ret_vec_page_cross) + # ifdef USE_AS_STRNCMP - cmpq %r11, %rdx - jae L(zero) + addl $16, %OFFSET_REG + subq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross_slow_case0) + subq $-(VEC_SIZE * 4), %rdx + + leaq -(VEC_SIZE * 4)(%rdi, %OFFSET_REG64), %rdi + leaq -(VEC_SIZE * 4)(%rsi, %OFFSET_REG64), %rsi +# else + leaq (16 - VEC_SIZE * 4)(%rdi, %OFFSET_REG64), %rdi + leaq (16 - VEC_SIZE * 4)(%rsi, %OFFSET_REG64), %rsi # endif -# ifdef USE_AS_WCSCMP + jmp L(prepare_loop_aligned) + +# ifdef USE_AS_STRNCMP + .p2align 4,, 2 +L(ret_zero_page_cross_slow_case0): xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - jne L(wcscmp_return) -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax + ret # endif - VZEROUPPER_RETURN - /* Comparing on page boundary region requires special treatment: - It must done one vector at the time, starting with the wider - ymm vector if possible, if not, with xmm. If fetching 16 bytes - (xmm) still passes the boundary, byte comparison must be done. - */ - .p2align 4 -L(cross_page): - /* Try one ymm vector at a time. */ - cmpl $(PAGE_SIZE - VEC_SIZE), %eax - jg L(cross_page_1_vector) -L(loop_1_vector): - vmovdqu (%rdi, %rdx), %ymm1 - VPCMPEQ (%rsi, %rdx), %ymm1, %ymm0 - VPMINU %ymm1, %ymm0, %ymm0 - VPCMPEQ %ymm7, %ymm0, %ymm0 - vpmovmskb %ymm0, %ecx - testl %ecx, %ecx - jne L(last_vector) - addl $VEC_SIZE, %edx + .p2align 4,, 10 +L(less_16_till_page): + /* Find largest load size we can use. */ + cmpl $24, %eax + ja L(less_8_till_page) - addl $VEC_SIZE, %eax -# ifdef USE_AS_STRNCMP - /* Return 0 if the current offset (%rdx) >= the maximum offset - (%r11). */ - cmpq %r11, %rdx - jae L(zero) -# endif - cmpl $(PAGE_SIZE - VEC_SIZE), %eax - jle L(loop_1_vector) -L(cross_page_1_vector): - /* Less than 32 bytes to check, try one xmm vector. */ - cmpl $(PAGE_SIZE - 16), %eax - jg L(cross_page_1_xmm) - vmovdqu (%rdi, %rdx), %xmm1 - VPCMPEQ (%rsi, %rdx), %xmm1, %xmm0 - VPMINU %xmm1, %xmm0, %xmm0 - VPCMPEQ %xmm7, %xmm0, %xmm0 - vpmovmskb %xmm0, %ecx - testl %ecx, %ecx - jne L(last_vector) + vmovq (%rdi), %xmm0 + vmovq (%rsi), %xmm1 + VPCMPEQ %xmm0, %xmmZERO, %xmm2 + VPCMPEQ %xmm1, %xmm0, %xmm1 + vpandn %xmm1, %xmm2, %xmm1 + vpmovmskb %ymm1, %ecx + incb %cl + jnz L(check_ret_vec_page_cross) - addl $16, %edx -# ifndef USE_AS_WCSCMP - addl $16, %eax + +# ifdef USE_AS_STRNCMP + cmpq $8, %rdx + jbe L(ret_zero_page_cross_slow_case0) # endif + movl $24, %OFFSET_REG + /* Explicit check for 16 byte alignment. */ + subl %eax, %OFFSET_REG + + + + vmovq (%rdi, %OFFSET_REG64), %xmm0 + vmovq (%rsi, %OFFSET_REG64), %xmm1 + VPCMPEQ %xmm0, %xmmZERO, %xmm2 + VPCMPEQ %xmm1, %xmm0, %xmm1 + vpandn %xmm1, %xmm2, %xmm1 + vpmovmskb %ymm1, %ecx + incb %cl + jnz L(check_ret_vec_page_cross) + # ifdef USE_AS_STRNCMP - /* Return 0 if the current offset (%rdx) >= the maximum offset - (%r11). */ - cmpq %r11, %rdx - jae L(zero) -# endif - -L(cross_page_1_xmm): -# ifndef USE_AS_WCSCMP - /* Less than 16 bytes to check, try 8 byte vector. NB: No need - for wcscmp nor wcsncmp since wide char is 4 bytes. */ - cmpl $(PAGE_SIZE - 8), %eax - jg L(cross_page_8bytes) - vmovq (%rdi, %rdx), %xmm1 - vmovq (%rsi, %rdx), %xmm0 - VPCMPEQ %xmm0, %xmm1, %xmm0 - VPMINU %xmm1, %xmm0, %xmm0 - VPCMPEQ %xmm7, %xmm0, %xmm0 - vpmovmskb %xmm0, %ecx - /* Only last 8 bits are valid. */ - andl $0xff, %ecx - testl %ecx, %ecx - jne L(last_vector) + addl $8, %OFFSET_REG + subq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross_slow_case0) + subq $-(VEC_SIZE * 4), %rdx - addl $8, %edx - addl $8, %eax + leaq -(VEC_SIZE * 4)(%rdi, %OFFSET_REG64), %rdi + leaq -(VEC_SIZE * 4)(%rsi, %OFFSET_REG64), %rsi +# else + leaq (8 - VEC_SIZE * 4)(%rdi, %OFFSET_REG64), %rdi + leaq (8 - VEC_SIZE * 4)(%rsi, %OFFSET_REG64), %rsi +# endif + jmp L(prepare_loop_aligned) + + + .p2align 4,, 10 +L(less_8_till_page): +# ifdef USE_AS_WCSCMP + /* If using wchar then this is the only check before we reach + the page boundary. */ + movl (%rdi), %eax + movl (%rsi), %ecx + cmpl %ecx, %eax + jnz L(ret_less_8_wcs) # ifdef USE_AS_STRNCMP - /* Return 0 if the current offset (%rdx) >= the maximum offset - (%r11). */ - cmpq %r11, %rdx - jae L(zero) + addq %rdi, %rdx + /* We already checked for len <= 1 so cannot hit that case here. + */ # endif + testl %eax, %eax + jnz L(prepare_loop_no_len) + ret -L(cross_page_8bytes): - /* Less than 8 bytes to check, try 4 byte vector. */ - cmpl $(PAGE_SIZE - 4), %eax - jg L(cross_page_4bytes) - vmovd (%rdi, %rdx), %xmm1 - vmovd (%rsi, %rdx), %xmm0 - VPCMPEQ %xmm0, %xmm1, %xmm0 - VPMINU %xmm1, %xmm0, %xmm0 - VPCMPEQ %xmm7, %xmm0, %xmm0 - vpmovmskb %xmm0, %ecx - /* Only last 4 bits are valid. */ - andl $0xf, %ecx - testl %ecx, %ecx - jne L(last_vector) + .p2align 4,, 8 +L(ret_less_8_wcs): + setl %OFFSET_REG8 + negl %OFFSET_REG + movl %OFFSET_REG, %eax + xorl %r8d, %eax + ret + +# else + + /* Find largest load size we can use. */ + cmpl $28, %eax + ja L(less_4_till_page) + + vmovd (%rdi), %xmm0 + vmovd (%rsi), %xmm1 + VPCMPEQ %xmm0, %xmmZERO, %xmm2 + VPCMPEQ %xmm1, %xmm0, %xmm1 + vpandn %xmm1, %xmm2, %xmm1 + vpmovmskb %ymm1, %ecx + subl $0xf, %ecx + jnz L(check_ret_vec_page_cross) - addl $4, %edx # ifdef USE_AS_STRNCMP - /* Return 0 if the current offset (%rdx) >= the maximum offset - (%r11). */ - cmpq %r11, %rdx - jae L(zero) + cmpq $4, %rdx + jbe L(ret_zero_page_cross_slow_case1) # endif + movl $28, %OFFSET_REG + /* Explicit check for 16 byte alignment. */ + subl %eax, %OFFSET_REG -L(cross_page_4bytes): -# endif - /* Less than 4 bytes to check, try one byte/dword at a time. */ -# ifdef USE_AS_STRNCMP - cmpq %r11, %rdx - jae L(zero) -# endif -# ifdef USE_AS_WCSCMP - movl (%rdi, %rdx), %eax - movl (%rsi, %rdx), %ecx -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %ecx -# endif - testl %eax, %eax - jne L(cross_page_loop) + + + vmovd (%rdi, %OFFSET_REG64), %xmm0 + vmovd (%rsi, %OFFSET_REG64), %xmm1 + VPCMPEQ %xmm0, %xmmZERO, %xmm2 + VPCMPEQ %xmm1, %xmm0, %xmm1 + vpandn %xmm1, %xmm2, %xmm1 + vpmovmskb %ymm1, %ecx + subl $0xf, %ecx + jnz L(check_ret_vec_page_cross) + +# ifdef USE_AS_STRNCMP + addl $4, %OFFSET_REG + subq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross_slow_case1) + subq $-(VEC_SIZE * 4), %rdx + + leaq -(VEC_SIZE * 4)(%rdi, %OFFSET_REG64), %rdi + leaq -(VEC_SIZE * 4)(%rsi, %OFFSET_REG64), %rsi +# else + leaq (4 - VEC_SIZE * 4)(%rdi, %OFFSET_REG64), %rdi + leaq (4 - VEC_SIZE * 4)(%rsi, %OFFSET_REG64), %rsi +# endif + jmp L(prepare_loop_aligned) + +# ifdef USE_AS_STRNCMP + .p2align 4,, 2 +L(ret_zero_page_cross_slow_case1): + xorl %eax, %eax + ret +# endif + + .p2align 4,, 10 +L(less_4_till_page): + subq %rdi, %rsi + /* Extremely slow byte comparison loop. */ +L(less_4_loop): + movzbl (%rdi), %eax + movzbl (%rsi, %rdi), %ecx subl %ecx, %eax - VZEROUPPER_RETURN -END (STRCMP) + jnz L(ret_less_4_loop) + testl %ecx, %ecx + jz L(ret_zero_4_loop) +# ifdef USE_AS_STRNCMP + decq %rdx + jz L(ret_zero_4_loop) +# endif + incq %rdi + /* end condition is reach page boundary (rdi is aligned). */ + testl $31, %edi + jnz L(less_4_loop) + leaq -(VEC_SIZE * 4)(%rdi, %rsi), %rsi + addq $-(VEC_SIZE * 4), %rdi +# ifdef USE_AS_STRNCMP + subq $-(VEC_SIZE * 4), %rdx +# endif + jmp L(prepare_loop_aligned) + +L(ret_zero_4_loop): + xorl %eax, %eax + ret +L(ret_less_4_loop): + xorl %r8d, %eax + subl %r8d, %eax + ret +# endif +END(STRCMP) #endif From patchwork Sun Jan 9 12:29:44 2022 Content-Type: text/plain; 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[73.202.60.99]) by smtp.googlemail.com with ESMTPSA id o27sm2979055pgm.1.2022.01.09.04.30.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Jan 2022 04:30:13 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH v1 2/5] x86: Optimize strcmp-evex.S and fix for [BZ# 28755] Date: Sun, 9 Jan 2022 06:29:44 -0600 Message-Id: <20220109122946.2754917-2-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220109122946.2754917-1-goldstein.w.n@gmail.com> References: <20220109122946.2754917-1-goldstein.w.n@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-10.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SCC_10_SHORT_WORD_LINES, SCC_5_SHORT_WORD_LINES, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Noah Goldstein via Libc-alpha From: Noah Goldstein Reply-To: Noah Goldstein Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Fixes [BZ# 28755] for wcsncmp by not multiply length by sizeof(wchar_t). Optimization are primarily to the loop logic and how the page cross logic interacts with the loop. The page cross logic is at times more expensive for short strings near the end of a page but not crossing the page. This is done to retest the page cross conditions with a non-faulty check and to improve the logic for entering the loop afterwards. This is only particular cases, however, and is general made up for by more than 10x improvements on the transition from the page cross -> loop case. The non-page cross cases as well are nearly universally improved. test-strcmp, test-strncmp, test-wcscmp, and test-wcsncmp all pass. Signed-off-by: Noah Goldstein --- sysdeps/x86_64/multiarch/strcmp-evex.S | 1702 +++++++++++++----------- 1 file changed, 919 insertions(+), 783 deletions(-) diff --git a/sysdeps/x86_64/multiarch/strcmp-evex.S b/sysdeps/x86_64/multiarch/strcmp-evex.S index 1d971f3889..e5070f3d53 100644 --- a/sysdeps/x86_64/multiarch/strcmp-evex.S +++ b/sysdeps/x86_64/multiarch/strcmp-evex.S @@ -26,54 +26,69 @@ # define PAGE_SIZE 4096 -/* VEC_SIZE = Number of bytes in a ymm register */ + /* VEC_SIZE = Number of bytes in a ymm register. */ # define VEC_SIZE 32 +# define CHAR_PER_VEC (VEC_SIZE / SIZE_OF_CHAR) -/* Shift for dividing by (VEC_SIZE * 4). */ -# define DIVIDE_BY_VEC_4_SHIFT 7 -# if (VEC_SIZE * 4) != (1 << DIVIDE_BY_VEC_4_SHIFT) -# error (VEC_SIZE * 4) != (1 << DIVIDE_BY_VEC_4_SHIFT) -# endif - -# define VMOVU vmovdqu64 -# define VMOVA vmovdqa64 +# define VMOVU vmovdqu64 +# define VMOVA vmovdqa64 # ifdef USE_AS_WCSCMP -/* Compare packed dwords. */ -# define VPCMP vpcmpd +# define TESTEQ subl $0xff, + /* Compare packed dwords. */ +# define VPCMP vpcmpd # define VPMINU vpminud # define VPTESTM vptestmd -# define SHIFT_REG32 r8d -# define SHIFT_REG64 r8 -/* 1 dword char == 4 bytes. */ + /* 1 dword char == 4 bytes. */ # define SIZE_OF_CHAR 4 # else -/* Compare packed bytes. */ -# define VPCMP vpcmpb +# define TESTEQ incl + /* Compare packed bytes. */ +# define VPCMP vpcmpb # define VPMINU vpminub # define VPTESTM vptestmb -# define SHIFT_REG32 ecx -# define SHIFT_REG64 rcx -/* 1 byte char == 1 byte. */ + /* 1 byte char == 1 byte. */ # define SIZE_OF_CHAR 1 # endif +# ifdef USE_AS_STRNCMP +# define LOOP_REG r9d +# define LOOP_REG64 r9 + +# define OFFSET_REG8 r9b +# define OFFSET_REG r9d +# define OFFSET_REG64 r9 +# else +# define LOOP_REG edx +# define LOOP_REG64 rdx + +# define OFFSET_REG8 dl +# define OFFSET_REG edx +# define OFFSET_REG64 rdx +# endif + +# if defined USE_AS_STRNCMP || defined USE_AS_WCSCMP +# define VEC_OFFSET 0 +# else +# define VEC_OFFSET (-VEC_SIZE) +# endif + # define XMMZERO xmm16 -# define XMM0 xmm17 -# define XMM1 xmm18 +# define XMM0 xmm17 +# define XMM1 xmm18 # define YMMZERO ymm16 -# define YMM0 ymm17 -# define YMM1 ymm18 -# define YMM2 ymm19 -# define YMM3 ymm20 -# define YMM4 ymm21 -# define YMM5 ymm22 -# define YMM6 ymm23 -# define YMM7 ymm24 -# define YMM8 ymm25 -# define YMM9 ymm26 -# define YMM10 ymm27 +# define YMM0 ymm17 +# define YMM1 ymm18 +# define YMM2 ymm19 +# define YMM3 ymm20 +# define YMM4 ymm21 +# define YMM5 ymm22 +# define YMM6 ymm23 +# define YMM7 ymm24 +# define YMM8 ymm25 +# define YMM9 ymm26 +# define YMM10 ymm27 /* Warning! wcscmp/wcsncmp have to use SIGNED comparison for elements. @@ -96,975 +111,1096 @@ the maximum offset is reached before a difference is found, zero is returned. */ - .section .text.evex,"ax",@progbits -ENTRY (STRCMP) + .section .text.evex, "ax", @progbits +ENTRY(STRCMP) # ifdef USE_AS_STRNCMP - /* Check for simple cases (0 or 1) in offset. */ - cmp $1, %RDX_LP - je L(char0) - jb L(zero) -# ifdef USE_AS_WCSCMP - /* Convert units: from wide to byte char. */ - shl $2, %RDX_LP +# ifdef __ILP32__ + /* Clear the upper 32 bits. */ + movl %edx, %rdx # endif - /* Register %r11 tracks the maximum offset. */ - mov %RDX_LP, %R11_LP + cmp $1, %RDX_LP + /* Signed comparison intentional. We use this branch to also + test cases where length >= 2^63. These very large sizes can be + handled with strcmp as there is no way for that length to + actually bound the buffer. */ + jle L(one_or_less) # endif movl %edi, %eax - xorl %edx, %edx - /* Make %XMMZERO (%YMMZERO) all zeros in this function. */ - vpxorq %XMMZERO, %XMMZERO, %XMMZERO orl %esi, %eax - andl $(PAGE_SIZE - 1), %eax - cmpl $(PAGE_SIZE - (VEC_SIZE * 4)), %eax - jg L(cross_page) - /* Start comparing 4 vectors. */ + /* Shift out the bits irrelivant to page boundary ([63:12]). */ + sall $20, %eax + /* Check if s1 or s2 may cross a page in next 4x VEC loads. */ + cmpl $((PAGE_SIZE -(VEC_SIZE * 4)) << 20), %eax + ja L(page_cross) + +L(no_page_cross): + /* Safe to compare 4x vectors. */ VMOVU (%rdi), %YMM0 - - /* Each bit set in K2 represents a non-null CHAR in YMM0. */ VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR in YMM0 and 32 bytes at (%rsi). */ VPCMP $0, (%rsi), %YMM0, %k1{%k2} - kmovd %k1, %ecx -# ifdef USE_AS_WCSCMP - subl $0xff, %ecx -# else - incl %ecx -# endif - je L(next_3_vectors) - tzcntl %ecx, %edx -# ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %edx -# endif # ifdef USE_AS_STRNCMP - /* Return 0 if the mismatched index (%rdx) is after the maximum - offset (%r11). */ - cmpq %r11, %rdx - jae L(zero) + cmpq $CHAR_PER_VEC, %rdx + jbe L(vec_0_test_len) # endif + + /* TESTEQ is `incl` for strcmp/strncmp and `subl $0xff` for + wcscmp/wcsncmp. */ + + /* All 1s represents all equals. TESTEQ will overflow to zero in + all equals case. Otherwise 1s will carry until position of first + mismatch. */ + TESTEQ %ecx + jz L(more_3x_vec) + + .p2align 4,, 4 +L(return_vec_0): + tzcntl %ecx, %ecx # ifdef USE_AS_WCSCMP + movl (%rdi, %rcx, SIZE_OF_CHAR), %edx xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - je L(return) -L(wcscmp_return): + cmpl (%rsi, %rcx, SIZE_OF_CHAR), %edx + je L(ret0) setl %al negl %eax orl $1, %eax -L(return): # else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax + movzbl (%rdi, %rcx), %eax + movzbl (%rsi, %rcx), %ecx + subl %ecx, %eax # endif +L(ret0): ret -L(return_vec_size): - tzcntl %ecx, %edx -# ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %edx -# endif # ifdef USE_AS_STRNCMP - /* Return 0 if the mismatched index (%rdx + VEC_SIZE) is after - the maximum offset (%r11). */ - addq $VEC_SIZE, %rdx - cmpq %r11, %rdx - jae L(zero) -# ifdef USE_AS_WCSCMP + .p2align 4,, 4 +L(vec_0_test_len): + notl %ecx + bzhil %edx, %ecx, %eax + jnz L(return_vec_0) + /* Align if will cross fetch block. */ + .p2align 4,, 2 +L(ret_zero): xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - jne L(wcscmp_return) -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax -# endif -# else + ret + + .p2align 4,, 5 +L(one_or_less): + jb L(ret_zero) # ifdef USE_AS_WCSCMP + /* 'nbe' covers the case where length is negative (large + unsigned). */ + jnbe __wcscmp_evex + movl (%rdi), %edx xorl %eax, %eax - movl VEC_SIZE(%rdi, %rdx), %ecx - cmpl VEC_SIZE(%rsi, %rdx), %ecx - jne L(wcscmp_return) + cmpl (%rsi), %edx + je L(ret1) + setl %al + negl %eax + orl $1, %eax # else - movzbl VEC_SIZE(%rdi, %rdx), %eax - movzbl VEC_SIZE(%rsi, %rdx), %edx - subl %edx, %eax + /* 'nbe' covers the case where length is negative (large + unsigned). */ + jnbe __strcmp_evex + movzbl (%rdi), %eax + movzbl (%rsi), %ecx + subl %ecx, %eax # endif -# endif +L(ret1): ret +# endif -L(return_2_vec_size): - tzcntl %ecx, %edx + .p2align 4,, 10 +L(return_vec_1): + tzcntl %ecx, %ecx +# ifdef USE_AS_STRNCMP + /* rdx must be > CHAR_PER_VEC so its safe to subtract without + worrying about underflow. */ + addq $-CHAR_PER_VEC, %rdx + cmpq %rcx, %rdx + jbe L(ret_zero) +# endif # ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %edx + movl VEC_SIZE(%rdi, %rcx, SIZE_OF_CHAR), %edx + xorl %eax, %eax + cmpl VEC_SIZE(%rsi, %rcx, SIZE_OF_CHAR), %edx + je L(ret2) + setl %al + negl %eax + orl $1, %eax +# else + movzbl VEC_SIZE(%rdi, %rcx), %eax + movzbl VEC_SIZE(%rsi, %rcx), %ecx + subl %ecx, %eax # endif +L(ret2): + ret + + .p2align 4,, 10 # ifdef USE_AS_STRNCMP - /* Return 0 if the mismatched index (%rdx + 2 * VEC_SIZE) is - after the maximum offset (%r11). */ - addq $(VEC_SIZE * 2), %rdx - cmpq %r11, %rdx - jae L(zero) -# ifdef USE_AS_WCSCMP - xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - jne L(wcscmp_return) +L(return_vec_3): +# if CHAR_PER_VEC <= 16 + sall $CHAR_PER_VEC, %ecx # else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax + salq $CHAR_PER_VEC, %rcx # endif +# endif +L(return_vec_2): +# if (CHAR_PER_VEC <= 16) || !(defined USE_AS_STRNCMP) + tzcntl %ecx, %ecx # else -# ifdef USE_AS_WCSCMP - xorl %eax, %eax - movl (VEC_SIZE * 2)(%rdi, %rdx), %ecx - cmpl (VEC_SIZE * 2)(%rsi, %rdx), %ecx - jne L(wcscmp_return) -# else - movzbl (VEC_SIZE * 2)(%rdi, %rdx), %eax - movzbl (VEC_SIZE * 2)(%rsi, %rdx), %edx - subl %edx, %eax -# endif + tzcntq %rcx, %rcx # endif - ret -L(return_3_vec_size): - tzcntl %ecx, %edx -# ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %edx -# endif # ifdef USE_AS_STRNCMP - /* Return 0 if the mismatched index (%rdx + 3 * VEC_SIZE) is - after the maximum offset (%r11). */ - addq $(VEC_SIZE * 3), %rdx - cmpq %r11, %rdx - jae L(zero) -# ifdef USE_AS_WCSCMP + cmpq %rcx, %rdx + jbe L(ret_zero) +# endif + +# ifdef USE_AS_WCSCMP + movl (VEC_SIZE * 2)(%rdi, %rcx, SIZE_OF_CHAR), %edx xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - jne L(wcscmp_return) -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax -# endif + cmpl (VEC_SIZE * 2)(%rsi, %rcx, SIZE_OF_CHAR), %edx + je L(ret3) + setl %al + negl %eax + orl $1, %eax # else + movzbl (VEC_SIZE * 2)(%rdi, %rcx), %eax + movzbl (VEC_SIZE * 2)(%rsi, %rcx), %ecx + subl %ecx, %eax +# endif +L(ret3): + ret + +# ifndef USE_AS_STRNCMP + .p2align 4,, 10 +L(return_vec_3): + tzcntl %ecx, %ecx # ifdef USE_AS_WCSCMP + movl (VEC_SIZE * 3)(%rdi, %rcx, SIZE_OF_CHAR), %edx xorl %eax, %eax - movl (VEC_SIZE * 3)(%rdi, %rdx), %ecx - cmpl (VEC_SIZE * 3)(%rsi, %rdx), %ecx - jne L(wcscmp_return) + cmpl (VEC_SIZE * 3)(%rsi, %rcx, SIZE_OF_CHAR), %edx + je L(ret4) + setl %al + negl %eax + orl $1, %eax # else - movzbl (VEC_SIZE * 3)(%rdi, %rdx), %eax - movzbl (VEC_SIZE * 3)(%rsi, %rdx), %edx - subl %edx, %eax + movzbl (VEC_SIZE * 3)(%rdi, %rcx), %eax + movzbl (VEC_SIZE * 3)(%rsi, %rcx), %ecx + subl %ecx, %eax # endif -# endif +L(ret4): ret +# endif - .p2align 4 -L(next_3_vectors): - VMOVU VEC_SIZE(%rdi), %YMM0 - /* Each bit set in K2 represents a non-null CHAR in YMM0. */ + /* 32 byte align here ensures the main loop is ideally aligned + for DSB. */ + .p2align 5 +L(more_3x_vec): + /* Safe to compare 4x vectors. */ + VMOVU (VEC_SIZE)(%rdi), %YMM0 VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in YMM0 and 32 bytes at VEC_SIZE(%rsi). */ - VPCMP $0, VEC_SIZE(%rsi), %YMM0, %k1{%k2} + VPCMP $0, (VEC_SIZE)(%rsi), %YMM0, %k1{%k2} kmovd %k1, %ecx -# ifdef USE_AS_WCSCMP - subl $0xff, %ecx -# else - incl %ecx + TESTEQ %ecx + jnz L(return_vec_1) + +# ifdef USE_AS_STRNCMP + subq $(CHAR_PER_VEC * 2), %rdx + jbe L(ret_zero) # endif - jne L(return_vec_size) VMOVU (VEC_SIZE * 2)(%rdi), %YMM0 - /* Each bit set in K2 represents a non-null CHAR in YMM0. */ VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in YMM0 and 32 bytes at (VEC_SIZE * 2)(%rsi). */ VPCMP $0, (VEC_SIZE * 2)(%rsi), %YMM0, %k1{%k2} kmovd %k1, %ecx -# ifdef USE_AS_WCSCMP - subl $0xff, %ecx -# else - incl %ecx -# endif - jne L(return_2_vec_size) + TESTEQ %ecx + jnz L(return_vec_2) VMOVU (VEC_SIZE * 3)(%rdi), %YMM0 - /* Each bit set in K2 represents a non-null CHAR in YMM0. */ VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in YMM0 and 32 bytes at (VEC_SIZE * 2)(%rsi). */ VPCMP $0, (VEC_SIZE * 3)(%rsi), %YMM0, %k1{%k2} kmovd %k1, %ecx + TESTEQ %ecx + jnz L(return_vec_3) + +# ifdef USE_AS_STRNCMP + cmpq $(CHAR_PER_VEC * 2), %rdx + jbe L(ret_zero) +# endif + + # ifdef USE_AS_WCSCMP - subl $0xff, %ecx + /* any non-zero positive value that doesn't inference with 0x1. + */ + movl $2, %r8d + # else - incl %ecx + xorl %r8d, %r8d # endif - jne L(return_3_vec_size) -L(main_loop_header): - leaq (VEC_SIZE * 4)(%rdi), %rdx - movl $PAGE_SIZE, %ecx - /* Align load via RAX. */ - andq $-(VEC_SIZE * 4), %rdx - subq %rdi, %rdx - leaq (%rdi, %rdx), %rax + + /* The prepare labels are various entry points from the page + cross logic. */ +L(prepare_loop): + # ifdef USE_AS_STRNCMP - /* Starting from this point, the maximum offset, or simply the - 'offset', DECREASES by the same amount when base pointers are - moved forward. Return 0 when: - 1) On match: offset <= the matched vector index. - 2) On mistmach, offset is before the mistmatched index. - */ - subq %rdx, %r11 - jbe L(zero) +# ifdef USE_AS_WCSCMP +L(prepare_loop_no_len): + movl %edi, %ecx + andl $(VEC_SIZE * 4 - 1), %ecx + shrl $2, %ecx + leaq (CHAR_PER_VEC * 2)(%rdx, %rcx), %rdx +# else + /* Store N + (VEC_SIZE * 4) and place check at the begining of + the loop. */ + leaq (VEC_SIZE * 2)(%rdi, %rdx), %rdx +L(prepare_loop_no_len): +# endif +# else +L(prepare_loop_no_len): +# endif + + /* Align s1 and adjust s2 accordingly. */ + subq %rdi, %rsi + andq $-(VEC_SIZE * 4), %rdi +L(prepare_loop_readj): + addq %rdi, %rsi +# if (defined USE_AS_STRNCMP) && !(defined USE_AS_WCSCMP) + subq %rdi, %rdx # endif - addq %rsi, %rdx - movq %rdx, %rsi - andl $(PAGE_SIZE - 1), %esi - /* Number of bytes before page crossing. */ - subq %rsi, %rcx - /* Number of VEC_SIZE * 4 blocks before page crossing. */ - shrq $DIVIDE_BY_VEC_4_SHIFT, %rcx - /* ESI: Number of VEC_SIZE * 4 blocks before page crossing. */ - movl %ecx, %esi - jmp L(loop_start) +L(prepare_loop_aligned): + /* eax stores distance from rsi to next page cross. These cases + need to be handled specially as the 4x loop could potentially + read memory past the length of s1 or s2 and across a page + boundary. */ + movl $-(VEC_SIZE * 4), %eax + subl %esi, %eax + andl $(PAGE_SIZE - 1), %eax + + vpxorq %YMMZERO, %YMMZERO, %YMMZERO + + /* Loop 4x comparisons at a time. */ .p2align 4 L(loop): + + /* End condition for strncmp. */ # ifdef USE_AS_STRNCMP - /* Base pointers are moved forward by 4 * VEC_SIZE. Decrease - the maximum offset (%r11) by the same amount. */ - subq $(VEC_SIZE * 4), %r11 - jbe L(zero) + subq $(CHAR_PER_VEC * 4), %rdx + jbe L(ret_zero) # endif - addq $(VEC_SIZE * 4), %rax - addq $(VEC_SIZE * 4), %rdx -L(loop_start): - testl %esi, %esi - leal -1(%esi), %esi - je L(loop_cross_page) -L(back_to_loop): - /* Main loop, comparing 4 vectors are a time. */ - VMOVA (%rax), %YMM0 - VMOVA VEC_SIZE(%rax), %YMM2 - VMOVA (VEC_SIZE * 2)(%rax), %YMM4 - VMOVA (VEC_SIZE * 3)(%rax), %YMM6 + + subq $-(VEC_SIZE * 4), %rdi + subq $-(VEC_SIZE * 4), %rsi + + /* Check if rsi loads will cross a page boundary. */ + addl $-(VEC_SIZE * 4), %eax + jnb L(page_cross_during_loop) + + /* Loop entry after handling page cross during loop. */ +L(loop_skip_page_cross_check): + VMOVA (VEC_SIZE * 0)(%rdi), %YMM0 + VMOVA (VEC_SIZE * 1)(%rdi), %YMM2 + VMOVA (VEC_SIZE * 2)(%rdi), %YMM4 + VMOVA (VEC_SIZE * 3)(%rdi), %YMM6 VPMINU %YMM0, %YMM2, %YMM8 VPMINU %YMM4, %YMM6, %YMM9 - /* A zero CHAR in YMM8 means that there is a null CHAR. */ - VPMINU %YMM8, %YMM9, %YMM8 + /* A zero CHAR in YMM9 means that there is a null CHAR. */ + VPMINU %YMM8, %YMM9, %YMM9 /* Each bit set in K1 represents a non-null CHAR in YMM8. */ - VPTESTM %YMM8, %YMM8, %k1 + VPTESTM %YMM9, %YMM9, %k1 - /* (YMM ^ YMM): A non-zero CHAR represents a mismatch. */ - vpxorq (%rdx), %YMM0, %YMM1 - vpxorq VEC_SIZE(%rdx), %YMM2, %YMM3 - vpxorq (VEC_SIZE * 2)(%rdx), %YMM4, %YMM5 - vpxorq (VEC_SIZE * 3)(%rdx), %YMM6, %YMM7 + vpxorq (VEC_SIZE * 0)(%rsi), %YMM0, %YMM1 + vpxorq (VEC_SIZE * 1)(%rsi), %YMM2, %YMM3 + vpxorq (VEC_SIZE * 2)(%rsi), %YMM4, %YMM5 + /* Ternary logic to xor (VEC_SIZE * 3)(%rsi) with YMM6 while + oring with YMM1. Result is stored in YMM6. */ + vpternlogd $0xde, (VEC_SIZE * 3)(%rsi), %YMM1, %YMM6 - vporq %YMM1, %YMM3, %YMM9 - vporq %YMM5, %YMM7, %YMM10 + /* Or together YMM3, YMM5, and YMM6. */ + vpternlogd $0xfe, %YMM3, %YMM5, %YMM6 - /* A non-zero CHAR in YMM9 represents a mismatch. */ - vporq %YMM9, %YMM10, %YMM9 - /* Each bit cleared in K0 represents a mismatch or a null CHAR. */ - VPCMP $0, %YMMZERO, %YMM9, %k0{%k1} - kmovd %k0, %ecx -# ifdef USE_AS_WCSCMP - subl $0xff, %ecx -# else - incl %ecx -# endif - je L(loop) + /* A non-zero CHAR in YMM6 represents a mismatch. */ + VPCMP $0, %YMMZERO, %YMM6, %k0{%k1} + kmovd %k0, %LOOP_REG + + TESTEQ %LOOP_REG + jz L(loop) - /* Each bit set in K1 represents a non-null CHAR in YMM0. */ + + /* Find which VEC has the mismatch of end of string. */ VPTESTM %YMM0, %YMM0, %k1 - /* Each bit cleared in K0 represents a mismatch or a null CHAR - in YMM0 and (%rdx). */ VPCMP $0, %YMMZERO, %YMM1, %k0{%k1} kmovd %k0, %ecx -# ifdef USE_AS_WCSCMP - subl $0xff, %ecx -# else - incl %ecx -# endif - je L(test_vec) - tzcntl %ecx, %ecx -# ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %ecx -# endif -# ifdef USE_AS_STRNCMP - cmpq %rcx, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif -# else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif -# endif - ret + TESTEQ %ecx + jnz L(return_vec_0_end) - .p2align 4 -L(test_vec): -# ifdef USE_AS_STRNCMP - /* The first vector matched. Return 0 if the maximum offset - (%r11) <= VEC_SIZE. */ - cmpq $VEC_SIZE, %r11 - jbe L(zero) -# endif - /* Each bit set in K1 represents a non-null CHAR in YMM2. */ VPTESTM %YMM2, %YMM2, %k1 - /* Each bit cleared in K0 represents a mismatch or a null CHAR - in YMM2 and VEC_SIZE(%rdx). */ VPCMP $0, %YMMZERO, %YMM3, %k0{%k1} kmovd %k0, %ecx -# ifdef USE_AS_WCSCMP - subl $0xff, %ecx -# else - incl %ecx -# endif - je L(test_2_vec) - tzcntl %ecx, %edi -# ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %edi -# endif -# ifdef USE_AS_STRNCMP - addq $VEC_SIZE, %rdi - cmpq %rdi, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (%rsi, %rdi), %ecx - cmpl (%rdx, %rdi), %ecx - jne L(wcscmp_return) -# else - movzbl (%rax, %rdi), %eax - movzbl (%rdx, %rdi), %edx - subl %edx, %eax -# endif -# else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl VEC_SIZE(%rsi, %rdi), %ecx - cmpl VEC_SIZE(%rdx, %rdi), %ecx - jne L(wcscmp_return) -# else - movzbl VEC_SIZE(%rax, %rdi), %eax - movzbl VEC_SIZE(%rdx, %rdi), %edx - subl %edx, %eax -# endif -# endif - ret + TESTEQ %ecx + jnz L(return_vec_1_end) - .p2align 4 -L(test_2_vec): + + /* Handle VEC 2 and 3 without branches. */ +L(return_vec_2_3_end): # ifdef USE_AS_STRNCMP - /* The first 2 vectors matched. Return 0 if the maximum offset - (%r11) <= 2 * VEC_SIZE. */ - cmpq $(VEC_SIZE * 2), %r11 - jbe L(zero) + subq $(CHAR_PER_VEC * 2), %rdx + jbe L(ret_zero_end) # endif - /* Each bit set in K1 represents a non-null CHAR in YMM4. */ + VPTESTM %YMM4, %YMM4, %k1 - /* Each bit cleared in K0 represents a mismatch or a null CHAR - in YMM4 and (VEC_SIZE * 2)(%rdx). */ VPCMP $0, %YMMZERO, %YMM5, %k0{%k1} kmovd %k0, %ecx -# ifdef USE_AS_WCSCMP - subl $0xff, %ecx + TESTEQ %ecx +# if CHAR_PER_VEC <= 16 + sall $CHAR_PER_VEC, %LOOP_REG + orl %ecx, %LOOP_REG +# else + salq $CHAR_PER_VEC, %LOOP_REG64 + orq %rcx, %LOOP_REG64 +# endif +L(return_vec_3_end): + /* LOOP_REG contains matches for null/mismatch from the loop. If + VEC 0,1,and 2 all have no null and no mismatches then mismatch + must entirely be from VEC 3 which is fully represented by + LOOP_REG. */ +# if CHAR_PER_VEC <= 16 + tzcntl %LOOP_REG, %LOOP_REG # else - incl %ecx + tzcntq %LOOP_REG64, %LOOP_REG64 # endif - je L(test_3_vec) - tzcntl %ecx, %edi +# ifdef USE_AS_STRNCMP + cmpq %LOOP_REG64, %rdx + jbe L(ret_zero_end) +# endif + # ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %edi + movl (VEC_SIZE * 2)(%rdi, %LOOP_REG64, SIZE_OF_CHAR), %ecx + xorl %eax, %eax + cmpl (VEC_SIZE * 2)(%rsi, %LOOP_REG64, SIZE_OF_CHAR), %ecx + je L(ret5) + setl %al + negl %eax + xorl %r8d, %eax +# else + movzbl (VEC_SIZE * 2)(%rdi, %LOOP_REG64), %eax + movzbl (VEC_SIZE * 2)(%rsi, %LOOP_REG64), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret5): + ret + # ifdef USE_AS_STRNCMP - addq $(VEC_SIZE * 2), %rdi - cmpq %rdi, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi + .p2align 4,, 2 +L(ret_zero_end): xorl %eax, %eax - movl (%rsi, %rdi), %ecx - cmpl (%rdx, %rdi), %ecx - jne L(wcscmp_return) + ret +# endif + + + /* The L(return_vec_N_end) differ from L(return_vec_N) in that + they use the value of `r8` to negate the return value. This is + because the page cross logic can swap `rdi` and `rsi`. */ + .p2align 4,, 10 +# ifdef USE_AS_STRNCMP +L(return_vec_1_end): +# if CHAR_PER_VEC <= 16 + sall $CHAR_PER_VEC, %ecx # else - movzbl (%rax, %rdi), %eax - movzbl (%rdx, %rdi), %edx - subl %edx, %eax + salq $CHAR_PER_VEC, %rcx # endif +# endif +L(return_vec_0_end): +# if (CHAR_PER_VEC <= 16) || !(defined USE_AS_STRNCMP) + tzcntl %ecx, %ecx # else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (VEC_SIZE * 2)(%rsi, %rdi), %ecx - cmpl (VEC_SIZE * 2)(%rdx, %rdi), %ecx - jne L(wcscmp_return) -# else - movzbl (VEC_SIZE * 2)(%rax, %rdi), %eax - movzbl (VEC_SIZE * 2)(%rdx, %rdi), %edx - subl %edx, %eax -# endif + tzcntq %rcx, %rcx # endif - ret - .p2align 4 -L(test_3_vec): # ifdef USE_AS_STRNCMP - /* The first 3 vectors matched. Return 0 if the maximum offset - (%r11) <= 3 * VEC_SIZE. */ - cmpq $(VEC_SIZE * 3), %r11 - jbe L(zero) + cmpq %rcx, %rdx + jbe L(ret_zero_end) # endif - /* Each bit set in K1 represents a non-null CHAR in YMM6. */ - VPTESTM %YMM6, %YMM6, %k1 - /* Each bit cleared in K0 represents a mismatch or a null CHAR - in YMM6 and (VEC_SIZE * 3)(%rdx). */ - VPCMP $0, %YMMZERO, %YMM7, %k0{%k1} - kmovd %k0, %ecx + # ifdef USE_AS_WCSCMP - subl $0xff, %ecx + movl (%rdi, %rcx, SIZE_OF_CHAR), %edx + xorl %eax, %eax + cmpl (%rsi, %rcx, SIZE_OF_CHAR), %edx + je L(ret6) + setl %al + negl %eax + /* This is the non-zero case for `eax` so just xorl with `r8d` + flip is `rdi` and `rsi` where swapped. */ + xorl %r8d, %eax # else - incl %ecx + movzbl (%rdi, %rcx), %eax + movzbl (%rsi, %rcx), %ecx + subl %ecx, %eax + /* Flip `eax` if `rdi` and `rsi` where swapped in page cross + logic. Subtract `r8d` after xor for zero case. */ + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret6): + ret + +# ifndef USE_AS_STRNCMP + .p2align 4,, 10 +L(return_vec_1_end): tzcntl %ecx, %ecx -# ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %ecx -# endif -# ifdef USE_AS_STRNCMP - addq $(VEC_SIZE * 3), %rcx - cmpq %rcx, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (%rsi, %rcx), %esi - cmpl (%rdx, %rcx), %esi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif -# else # ifdef USE_AS_WCSCMP - movq %rax, %rsi + movl VEC_SIZE(%rdi, %rcx, SIZE_OF_CHAR), %edx xorl %eax, %eax - movl (VEC_SIZE * 3)(%rsi, %rcx), %esi - cmpl (VEC_SIZE * 3)(%rdx, %rcx), %esi - jne L(wcscmp_return) + cmpl VEC_SIZE(%rsi, %rcx, SIZE_OF_CHAR), %edx + je L(ret7) + setl %al + negl %eax + xorl %r8d, %eax # else - movzbl (VEC_SIZE * 3)(%rax, %rcx), %eax - movzbl (VEC_SIZE * 3)(%rdx, %rcx), %edx - subl %edx, %eax + movzbl VEC_SIZE(%rdi, %rcx), %eax + movzbl VEC_SIZE(%rsi, %rcx), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif -# endif +L(ret7): ret - - .p2align 4 -L(loop_cross_page): - xorl %r10d, %r10d - movq %rdx, %rcx - /* Align load via RDX. We load the extra ECX bytes which should - be ignored. */ - andl $((VEC_SIZE * 4) - 1), %ecx - /* R10 is -RCX. */ - subq %rcx, %r10 - - /* This works only if VEC_SIZE * 2 == 64. */ -# if (VEC_SIZE * 2) != 64 -# error (VEC_SIZE * 2) != 64 # endif - /* Check if the first VEC_SIZE * 2 bytes should be ignored. */ - cmpl $(VEC_SIZE * 2), %ecx - jge L(loop_cross_page_2_vec) - VMOVU (%rax, %r10), %YMM2 - VMOVU VEC_SIZE(%rax, %r10), %YMM3 + /* Page cross in rsi in next 4x VEC. */ - /* Each bit set in K2 represents a non-null CHAR in YMM2. */ - VPTESTM %YMM2, %YMM2, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in YMM2 and 32 bytes at (%rdx, %r10). */ - VPCMP $0, (%rdx, %r10), %YMM2, %k1{%k2} - kmovd %k1, %r9d - /* Don't use subl since it is the lower 16/32 bits of RDI - below. */ - notl %r9d -# ifdef USE_AS_WCSCMP - /* Only last 8 bits are valid. */ - andl $0xff, %r9d -# endif + /* TODO: Improve logic here. */ + .p2align 4,, 10 +L(page_cross_during_loop): + /* eax contains [distance_from_page - (VEC_SIZE * 4)]. */ - /* Each bit set in K4 represents a non-null CHAR in YMM3. */ - VPTESTM %YMM3, %YMM3, %k4 - /* Each bit cleared in K3 represents a mismatch or a null CHAR - in YMM3 and 32 bytes at VEC_SIZE(%rdx, %r10). */ - VPCMP $0, VEC_SIZE(%rdx, %r10), %YMM3, %k3{%k4} - kmovd %k3, %edi - /* Must use notl %edi here as lower bits are for CHAR - comparisons potentially out of range thus can be 0 without - indicating mismatch. */ - notl %edi -# ifdef USE_AS_WCSCMP - /* Don't use subl since it is the upper 8 bits of EDI below. */ - andl $0xff, %edi -# endif + /* Optimistically rsi and rdi and both aligned in which case we + don't need any logic here. */ + cmpl $-(VEC_SIZE * 4), %eax + /* Don't adjust eax before jumping back to loop and we will + never hit page cross case again. */ + je L(loop_skip_page_cross_check) -# ifdef USE_AS_WCSCMP - /* NB: Each bit in EDI/R9D represents 4-byte element. */ - sall $8, %edi - /* NB: Divide shift count by 4 since each bit in K1 represent 4 - bytes. */ - movl %ecx, %SHIFT_REG32 - sarl $2, %SHIFT_REG32 - - /* Each bit in EDI represents a null CHAR or a mismatch. */ - orl %r9d, %edi -# else - salq $32, %rdi + /* Check if we can safely load a VEC. */ + cmpl $-(VEC_SIZE * 3), %eax + jle L(less_1x_vec_till_page_cross) - /* Each bit in RDI represents a null CHAR or a mismatch. */ - orq %r9, %rdi -# endif + VMOVA (%rdi), %YMM0 + VPTESTM %YMM0, %YMM0, %k2 + VPCMP $0, (%rsi), %YMM0, %k1{%k2} + kmovd %k1, %ecx + TESTEQ %ecx + jnz L(return_vec_0_end) + + /* if distance >= 2x VEC then eax > -(VEC_SIZE * 2). */ + cmpl $-(VEC_SIZE * 2), %eax + jg L(more_2x_vec_till_page_cross) + + .p2align 4,, 4 +L(less_1x_vec_till_page_cross): + subl $-(VEC_SIZE * 4), %eax + /* Guranteed safe to read from rdi - VEC_SIZE here. The only + concerning case is first iteration if incoming s1 was near start + of a page and s2 near end. If s1 was near the start of the page + we already aligned up to nearest VEC_SIZE * 4 so gurnateed safe + to read back -VEC_SIZE. If rdi is truly at the start of a page + here, it means the previous page (rdi - VEC_SIZE) has already + been loaded earlier so must be valid. */ + VMOVU -VEC_SIZE(%rdi, %rax), %YMM0 + VPTESTM %YMM0, %YMM0, %k2 + VPCMP $0, -VEC_SIZE(%rsi, %rax), %YMM0, %k1{%k2} + + /* Mask of potentially valid bits. The lower bits can be out of + range comparisons (but safe regarding page crosses). */ - /* Since ECX < VEC_SIZE * 2, simply skip the first ECX bytes. */ - shrxq %SHIFT_REG64, %rdi, %rdi - testq %rdi, %rdi - je L(loop_cross_page_2_vec) - tzcntq %rdi, %rcx # ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %ecx + movl $-1, %r10d + movl %esi, %ecx + andl $(VEC_SIZE - 1), %ecx + shrl $2, %ecx + shlxl %ecx, %r10d, %ecx + movzbl %cl, %r10d +# else + movl $-1, %ecx + shlxl %esi, %ecx, %r10d # endif + + kmovd %k1, %ecx + notl %ecx + + # ifdef USE_AS_STRNCMP - cmpq %rcx, %r11 - jbe L(zero) # ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) + movl %eax, %r11d + shrl $2, %r11d + cmpq %r11, %rdx # else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax + cmpq %rax, %rdx # endif + jbe L(return_page_cross_end_check) +# endif + movl %eax, %OFFSET_REG + + /* Readjust eax before potentially returning to the loop. */ + addl $(PAGE_SIZE - VEC_SIZE * 4), %eax + + andl %r10d, %ecx + jz L(loop_skip_page_cross_check) + + .p2align 4,, 3 +L(return_page_cross_end): + tzcntl %ecx, %ecx + +# if (defined USE_AS_STRNCMP) || (defined USE_AS_WCSCMP) + leal -VEC_SIZE(%OFFSET_REG64, %rcx, SIZE_OF_CHAR), %ecx +L(return_page_cross_cmp_mem): # else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi + addl %OFFSET_REG, %ecx +# endif +# ifdef USE_AS_WCSCMP + movl VEC_OFFSET(%rdi, %rcx), %edx xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif + cmpl VEC_OFFSET(%rsi, %rcx), %edx + je L(ret8) + setl %al + negl %eax + xorl %r8d, %eax +# else + movzbl VEC_OFFSET(%rdi, %rcx), %eax + movzbl VEC_OFFSET(%rsi, %rcx), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret8): ret - .p2align 4 -L(loop_cross_page_2_vec): - /* The first VEC_SIZE * 2 bytes match or are ignored. */ - VMOVU (VEC_SIZE * 2)(%rax, %r10), %YMM0 - VMOVU (VEC_SIZE * 3)(%rax, %r10), %YMM1 +# ifdef USE_AS_STRNCMP + .p2align 4,, 10 +L(return_page_cross_end_check): + tzcntl %ecx, %ecx + leal -VEC_SIZE(%rax, %rcx, SIZE_OF_CHAR), %ecx +# ifdef USE_AS_WCSCMP + sall $2, %edx +# endif + cmpl %ecx, %edx + ja L(return_page_cross_cmp_mem) + xorl %eax, %eax + ret +# endif + + + .p2align 4,, 10 +L(more_2x_vec_till_page_cross): + /* If more 2x vec till cross we will complete a full loop + iteration here. */ + VMOVA VEC_SIZE(%rdi), %YMM0 VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in YMM0 and 32 bytes at (VEC_SIZE * 2)(%rdx, %r10). */ - VPCMP $0, (VEC_SIZE * 2)(%rdx, %r10), %YMM0, %k1{%k2} - kmovd %k1, %r9d - /* Don't use subl since it is the lower 16/32 bits of RDI - below. */ - notl %r9d -# ifdef USE_AS_WCSCMP - /* Only last 8 bits are valid. */ - andl $0xff, %r9d -# endif + VPCMP $0, VEC_SIZE(%rsi), %YMM0, %k1{%k2} + kmovd %k1, %ecx + TESTEQ %ecx + jnz L(return_vec_1_end) - VPTESTM %YMM1, %YMM1, %k4 - /* Each bit cleared in K3 represents a mismatch or a null CHAR - in YMM1 and 32 bytes at (VEC_SIZE * 3)(%rdx, %r10). */ - VPCMP $0, (VEC_SIZE * 3)(%rdx, %r10), %YMM1, %k3{%k4} - kmovd %k3, %edi - /* Must use notl %edi here as lower bits are for CHAR - comparisons potentially out of range thus can be 0 without - indicating mismatch. */ - notl %edi -# ifdef USE_AS_WCSCMP - /* Don't use subl since it is the upper 8 bits of EDI below. */ - andl $0xff, %edi +# ifdef USE_AS_STRNCMP + cmpq $(CHAR_PER_VEC * 2), %rdx + jbe L(ret_zero_in_loop_page_cross) # endif -# ifdef USE_AS_WCSCMP - /* NB: Each bit in EDI/R9D represents 4-byte element. */ - sall $8, %edi + subl $-(VEC_SIZE * 4), %eax - /* Each bit in EDI represents a null CHAR or a mismatch. */ - orl %r9d, %edi -# else - salq $32, %rdi + /* Safe to include comparisons from lower bytes. */ + VMOVU -(VEC_SIZE * 2)(%rdi, %rax), %YMM0 + VPTESTM %YMM0, %YMM0, %k2 + VPCMP $0, -(VEC_SIZE * 2)(%rsi, %rax), %YMM0, %k1{%k2} + kmovd %k1, %ecx + TESTEQ %ecx + jnz L(return_vec_page_cross_0) + + VMOVU -(VEC_SIZE * 1)(%rdi, %rax), %YMM0 + VPTESTM %YMM0, %YMM0, %k2 + VPCMP $0, -(VEC_SIZE * 1)(%rsi, %rax), %YMM0, %k1{%k2} + kmovd %k1, %ecx + TESTEQ %ecx + jnz L(return_vec_page_cross_1) - /* Each bit in RDI represents a null CHAR or a mismatch. */ - orq %r9, %rdi +# ifdef USE_AS_STRNCMP + /* Must check length here as length might proclude reading next + page. */ +# ifdef USE_AS_WCSCMP + movl %eax, %r11d + shrl $2, %r11d + cmpq %r11, %rdx +# else + cmpq %rax, %rdx +# endif + jbe L(ret_zero_in_loop_page_cross) # endif - xorl %r8d, %r8d - /* If ECX > VEC_SIZE * 2, skip ECX - (VEC_SIZE * 2) bytes. */ - subl $(VEC_SIZE * 2), %ecx - jle 1f - /* R8 has number of bytes skipped. */ - movl %ecx, %r8d -# ifdef USE_AS_WCSCMP - /* NB: Divide shift count by 4 since each bit in RDI represent 4 - bytes. */ - sarl $2, %ecx - /* Skip ECX bytes. */ - shrl %cl, %edi + /* Finish the loop. */ + VMOVA (VEC_SIZE * 2)(%rdi), %YMM4 + VMOVA (VEC_SIZE * 3)(%rdi), %YMM6 + VPMINU %YMM4, %YMM6, %YMM9 + VPTESTM %YMM9, %YMM9, %k1 + + vpxorq (VEC_SIZE * 2)(%rsi), %YMM4, %YMM5 + /* YMM6 = YMM5 | ((VEC_SIZE * 3)(%rsi) ^ YMM6). */ + vpternlogd $0xde, (VEC_SIZE * 3)(%rsi), %YMM5, %YMM6 + + VPCMP $0, %YMMZERO, %YMM6, %k0{%k1} + kmovd %k0, %LOOP_REG + TESTEQ %LOOP_REG + jnz L(return_vec_2_3_end) + + /* Best for code size to include ucond-jmp here. Would be faster + if this case is hot to duplicate the L(return_vec_2_3_end) code + as fall-through and have jump back to loop on mismatch + comparison. */ + subq $-(VEC_SIZE * 4), %rdi + subq $-(VEC_SIZE * 4), %rsi + addl $(PAGE_SIZE - VEC_SIZE * 8), %eax +# ifdef USE_AS_STRNCMP + subq $(CHAR_PER_VEC * 4), %rdx + ja L(loop_skip_page_cross_check) +L(ret_zero_in_loop_page_cross): + xorl %eax, %eax + ret # else - /* Skip ECX bytes. */ - shrq %cl, %rdi + jmp L(loop_skip_page_cross_check) # endif -1: - /* Before jumping back to the loop, set ESI to the number of - VEC_SIZE * 4 blocks before page crossing. */ - movl $(PAGE_SIZE / (VEC_SIZE * 4) - 1), %esi - testq %rdi, %rdi -# ifdef USE_AS_STRNCMP - /* At this point, if %rdi value is 0, it already tested - VEC_SIZE*4+%r10 byte starting from %rax. This label - checks whether strncmp maximum offset reached or not. */ - je L(string_nbyte_offset_check) + + .p2align 4,, 10 +L(return_vec_page_cross_0): + addl $-VEC_SIZE, %eax +L(return_vec_page_cross_1): + tzcntl %ecx, %ecx +# if defined USE_AS_STRNCMP || defined USE_AS_WCSCMP + leal -VEC_SIZE(%rax, %rcx, SIZE_OF_CHAR), %ecx +# ifdef USE_AS_STRNCMP +# ifdef USE_AS_WCSCMP + /* Must divide ecx instead of multiply rdx due to overflow. */ + movl %ecx, %eax + shrl $2, %eax + cmpq %rax, %rdx +# else + cmpq %rcx, %rdx +# endif + jbe L(ret_zero_in_loop_page_cross) +# endif # else - je L(back_to_loop) + addl %eax, %ecx # endif - tzcntq %rdi, %rcx + # ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %ecx -# endif - addq %r10, %rcx - /* Adjust for number of bytes skipped. */ - addq %r8, %rcx -# ifdef USE_AS_STRNCMP - addq $(VEC_SIZE * 2), %rcx - subq %rcx, %r11 - jbe L(zero) -# ifdef USE_AS_WCSCMP - movq %rax, %rsi + movl VEC_OFFSET(%rdi, %rcx), %edx xorl %eax, %eax - movl (%rsi, %rcx), %edi - cmpl (%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (%rax, %rcx), %eax - movzbl (%rdx, %rcx), %edx - subl %edx, %eax -# endif + cmpl VEC_OFFSET(%rsi, %rcx), %edx + je L(ret9) + setl %al + negl %eax + xorl %r8d, %eax # else -# ifdef USE_AS_WCSCMP - movq %rax, %rsi - xorl %eax, %eax - movl (VEC_SIZE * 2)(%rsi, %rcx), %edi - cmpl (VEC_SIZE * 2)(%rdx, %rcx), %edi - jne L(wcscmp_return) -# else - movzbl (VEC_SIZE * 2)(%rax, %rcx), %eax - movzbl (VEC_SIZE * 2)(%rdx, %rcx), %edx - subl %edx, %eax -# endif + movzbl VEC_OFFSET(%rdi, %rcx), %eax + movzbl VEC_OFFSET(%rsi, %rcx), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret9): ret -# ifdef USE_AS_STRNCMP -L(string_nbyte_offset_check): - leaq (VEC_SIZE * 4)(%r10), %r10 - cmpq %r10, %r11 - jbe L(zero) - jmp L(back_to_loop) + + .p2align 4,, 10 +L(page_cross): +# ifndef USE_AS_STRNCMP + /* If both are VEC aligned we don't need any special logic here. + Only valid for strcmp where stop condition is guranteed to be + reachable by just reading memory. */ + testl $((VEC_SIZE - 1) << 20), %eax + jz L(no_page_cross) # endif - .p2align 4 -L(cross_page_loop): - /* Check one byte/dword at a time. */ + movl %edi, %eax + movl %esi, %ecx + andl $(PAGE_SIZE - 1), %eax + andl $(PAGE_SIZE - 1), %ecx + + xorl %OFFSET_REG, %OFFSET_REG + + /* Check which is closer to page cross, s1 or s2. */ + cmpl %eax, %ecx + jg L(page_cross_s2) + + /* The previous page cross check has false positives. Check for + true positive as page cross logic is very expensive. */ + subl $(PAGE_SIZE - VEC_SIZE * 4), %eax + jbe L(no_page_cross) + + + /* Set r8 to not interfere with normal return value (rdi and rsi + did not swap). */ # ifdef USE_AS_WCSCMP - cmpl %ecx, %eax + /* any non-zero positive value that doesn't inference with 0x1. + */ + movl $2, %r8d # else - subl %ecx, %eax + xorl %r8d, %r8d # endif - jne L(different) - addl $SIZE_OF_CHAR, %edx - cmpl $(VEC_SIZE * 4), %edx - je L(main_loop_header) + + /* Check if less than 1x VEC till page cross. */ + subl $(VEC_SIZE * 3), %eax + jg L(less_1x_vec_till_page) + + + /* If more than 1x VEC till page cross, loop throuh safely + loadable memory until within 1x VEC of page cross. */ + .p2align 4,, 8 +L(page_cross_loop): + VMOVU (%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %YMM0 + VPTESTM %YMM0, %YMM0, %k2 + VPCMP $0, (%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %YMM0, %k1{%k2} + kmovd %k1, %ecx + TESTEQ %ecx + jnz L(check_ret_vec_page_cross) + addl $CHAR_PER_VEC, %OFFSET_REG # ifdef USE_AS_STRNCMP - cmpq %r11, %rdx - jae L(zero) + cmpq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross) # endif + addl $VEC_SIZE, %eax + jl L(page_cross_loop) + # ifdef USE_AS_WCSCMP - movl (%rdi, %rdx), %eax - movl (%rsi, %rdx), %ecx -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %ecx + shrl $2, %eax # endif - /* Check null CHAR. */ - testl %eax, %eax - jne L(cross_page_loop) - /* Since %eax == 0, subtract is OK for both SIGNED and UNSIGNED - comparisons. */ - subl %ecx, %eax -# ifndef USE_AS_WCSCMP -L(different): + + + subl %eax, %OFFSET_REG + /* OFFSET_REG has distance to page cross - VEC_SIZE. Guranteed + to not cross page so is safe to load. Since we have already + loaded at least 1 VEC from rsi it is also guranteed to be safe. + */ + VMOVU (%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %YMM0 + VPTESTM %YMM0, %YMM0, %k2 + VPCMP $0, (%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %YMM0, %k1{%k2} + + kmovd %k1, %ecx +# ifdef USE_AS_STRNCMP + leal CHAR_PER_VEC(%OFFSET_REG64), %eax + cmpq %rax, %rdx + jbe L(check_ret_vec_page_cross2) +# ifdef USE_AS_WCSCMP + addq $-(CHAR_PER_VEC * 2), %rdx +# else + addq %rdi, %rdx +# endif # endif - ret + TESTEQ %ecx + jz L(prepare_loop_no_len) + .p2align 4,, 4 +L(ret_vec_page_cross): +# ifndef USE_AS_STRNCMP +L(check_ret_vec_page_cross): +# endif + tzcntl %ecx, %ecx + addl %OFFSET_REG, %ecx +L(ret_vec_page_cross_cont): # ifdef USE_AS_WCSCMP - .p2align 4 -L(different): - /* Use movl to avoid modifying EFLAGS. */ - movl $0, %eax + movl (%rdi, %rcx, SIZE_OF_CHAR), %edx + xorl %eax, %eax + cmpl (%rsi, %rcx, SIZE_OF_CHAR), %edx + je L(ret12) setl %al negl %eax - orl $1, %eax - ret + xorl %r8d, %eax +# else + movzbl (%rdi, %rcx, SIZE_OF_CHAR), %eax + movzbl (%rsi, %rcx, SIZE_OF_CHAR), %ecx + subl %ecx, %eax + xorl %r8d, %eax + subl %r8d, %eax # endif +L(ret12): + ret + # ifdef USE_AS_STRNCMP - .p2align 4 -L(zero): + .p2align 4,, 10 +L(check_ret_vec_page_cross2): + TESTEQ %ecx +L(check_ret_vec_page_cross): + tzcntl %ecx, %ecx + addl %OFFSET_REG, %ecx + cmpq %rcx, %rdx + ja L(ret_vec_page_cross_cont) + .p2align 4,, 2 +L(ret_zero_page_cross): xorl %eax, %eax ret +# endif - .p2align 4 -L(char0): -# ifdef USE_AS_WCSCMP - xorl %eax, %eax - movl (%rdi), %ecx - cmpl (%rsi), %ecx - jne L(wcscmp_return) -# else - movzbl (%rsi), %ecx - movzbl (%rdi), %eax - subl %ecx, %eax -# endif - ret + .p2align 4,, 4 +L(page_cross_s2): + /* Ensure this is a true page cross. */ + subl $(PAGE_SIZE - VEC_SIZE * 4), %ecx + jbe L(no_page_cross) + + + movl %ecx, %eax + movq %rdi, %rcx + movq %rsi, %rdi + movq %rcx, %rsi + + /* set r8 to negate return value as rdi and rsi swapped. */ +# ifdef USE_AS_WCSCMP + movl $-4, %r8d +# else + movl $-1, %r8d # endif + xorl %OFFSET_REG, %OFFSET_REG - .p2align 4 -L(last_vector): - addq %rdx, %rdi - addq %rdx, %rsi -# ifdef USE_AS_STRNCMP - subq %rdx, %r11 + /* Check if more than 1x VEC till page cross. */ + subl $(VEC_SIZE * 3), %eax + jle L(page_cross_loop) + + .p2align 4,, 6 +L(less_1x_vec_till_page): +# ifdef USE_AS_WCSCMP + shrl $2, %eax # endif - tzcntl %ecx, %edx + /* Find largest load size we can use. */ + cmpl $(16 / SIZE_OF_CHAR), %eax + ja L(less_16_till_page) + + /* Use 16 byte comparison. */ + vmovdqu (%rdi), %xmm0 + VPTESTM %xmm0, %xmm0, %k2 + VPCMP $0, (%rsi), %xmm0, %k1{%k2} + kmovd %k1, %ecx # ifdef USE_AS_WCSCMP - /* NB: Multiply wchar_t count by 4 to get the number of bytes. */ - sall $2, %edx + subl $0xf, %ecx +# else + incw %cx # endif + jnz L(check_ret_vec_page_cross) + movl $(16 / SIZE_OF_CHAR), %OFFSET_REG # ifdef USE_AS_STRNCMP - cmpq %r11, %rdx - jae L(zero) + cmpq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross_slow_case0) + subl %eax, %OFFSET_REG +# else + /* Explicit check for 16 byte alignment. */ + subl %eax, %OFFSET_REG + jz L(prepare_loop) # endif + vmovdqu (%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %xmm0 + VPTESTM %xmm0, %xmm0, %k2 + VPCMP $0, (%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %xmm0, %k1{%k2} + kmovd %k1, %ecx # ifdef USE_AS_WCSCMP - xorl %eax, %eax - movl (%rdi, %rdx), %ecx - cmpl (%rsi, %rdx), %ecx - jne L(wcscmp_return) + subl $0xf, %ecx # else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %edx - subl %edx, %eax + incw %cx # endif + jnz L(check_ret_vec_page_cross) +# ifdef USE_AS_STRNCMP + addl $(16 / SIZE_OF_CHAR), %OFFSET_REG + subq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross_slow_case0) + subq $-(CHAR_PER_VEC * 4), %rdx + + leaq -(VEC_SIZE * 4)(%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %rdi + leaq -(VEC_SIZE * 4)(%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %rsi +# else + leaq (16 - VEC_SIZE * 4)(%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %rdi + leaq (16 - VEC_SIZE * 4)(%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %rsi +# endif + jmp L(prepare_loop_aligned) + +# ifdef USE_AS_STRNCMP + .p2align 4,, 2 +L(ret_zero_page_cross_slow_case0): + xorl %eax, %eax ret +# endif - /* Comparing on page boundary region requires special treatment: - It must done one vector at the time, starting with the wider - ymm vector if possible, if not, with xmm. If fetching 16 bytes - (xmm) still passes the boundary, byte comparison must be done. - */ - .p2align 4 -L(cross_page): - /* Try one ymm vector at a time. */ - cmpl $(PAGE_SIZE - VEC_SIZE), %eax - jg L(cross_page_1_vector) -L(loop_1_vector): - VMOVU (%rdi, %rdx), %YMM0 - VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in YMM0 and 32 bytes at (%rsi, %rdx). */ - VPCMP $0, (%rsi, %rdx), %YMM0, %k1{%k2} + .p2align 4,, 10 +L(less_16_till_page): + cmpl $(24 / SIZE_OF_CHAR), %eax + ja L(less_8_till_page) + + /* Use 8 byte comparison. */ + vmovq (%rdi), %xmm0 + vmovq (%rsi), %xmm1 + VPTESTM %xmm0, %xmm0, %k2 + VPCMP $0, %xmm1, %xmm0, %k1{%k2} kmovd %k1, %ecx # ifdef USE_AS_WCSCMP - subl $0xff, %ecx + subl $0x3, %ecx # else - incl %ecx + incb %cl # endif - jne L(last_vector) + jnz L(check_ret_vec_page_cross) - addl $VEC_SIZE, %edx - addl $VEC_SIZE, %eax # ifdef USE_AS_STRNCMP - /* Return 0 if the current offset (%rdx) >= the maximum offset - (%r11). */ - cmpq %r11, %rdx - jae L(zero) + cmpq $(8 / SIZE_OF_CHAR), %rdx + jbe L(ret_zero_page_cross_slow_case0) # endif - cmpl $(PAGE_SIZE - VEC_SIZE), %eax - jle L(loop_1_vector) -L(cross_page_1_vector): - /* Less than 32 bytes to check, try one xmm vector. */ - cmpl $(PAGE_SIZE - 16), %eax - jg L(cross_page_1_xmm) - VMOVU (%rdi, %rdx), %XMM0 + movl $(24 / SIZE_OF_CHAR), %OFFSET_REG + subl %eax, %OFFSET_REG - VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in XMM0 and 16 bytes at (%rsi, %rdx). */ - VPCMP $0, (%rsi, %rdx), %XMM0, %k1{%k2} + vmovq (%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %xmm0 + vmovq (%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %xmm1 + VPTESTM %xmm0, %xmm0, %k2 + VPCMP $0, %xmm1, %xmm0, %k1{%k2} kmovd %k1, %ecx # ifdef USE_AS_WCSCMP - subl $0xf, %ecx + subl $0x3, %ecx # else - subl $0xffff, %ecx + incb %cl # endif - jne L(last_vector) + jnz L(check_ret_vec_page_cross) + - addl $16, %edx -# ifndef USE_AS_WCSCMP - addl $16, %eax -# endif # ifdef USE_AS_STRNCMP - /* Return 0 if the current offset (%rdx) >= the maximum offset - (%r11). */ - cmpq %r11, %rdx - jae L(zero) + addl $(8 / SIZE_OF_CHAR), %OFFSET_REG + subq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross_slow_case0) + subq $-(CHAR_PER_VEC * 4), %rdx + + leaq -(VEC_SIZE * 4)(%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %rdi + leaq -(VEC_SIZE * 4)(%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %rsi +# else + leaq (8 - VEC_SIZE * 4)(%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %rdi + leaq (8 - VEC_SIZE * 4)(%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %rsi # endif + jmp L(prepare_loop_aligned) -L(cross_page_1_xmm): -# ifndef USE_AS_WCSCMP - /* Less than 16 bytes to check, try 8 byte vector. NB: No need - for wcscmp nor wcsncmp since wide char is 4 bytes. */ - cmpl $(PAGE_SIZE - 8), %eax - jg L(cross_page_8bytes) - vmovq (%rdi, %rdx), %XMM0 - vmovq (%rsi, %rdx), %XMM1 - VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in XMM0 and XMM1. */ - VPCMP $0, %XMM1, %XMM0, %k1{%k2} - kmovb %k1, %ecx + + + .p2align 4,, 10 +L(less_8_till_page): # ifdef USE_AS_WCSCMP - subl $0x3, %ecx + /* If using wchar then this is the only check before we reach + the page boundary. */ + movl (%rdi), %eax + movl (%rsi), %ecx + cmpl %ecx, %eax + jnz L(ret_less_8_wcs) +# ifdef USE_AS_STRNCMP + addq $-(CHAR_PER_VEC * 2), %rdx + /* We already checked for len <= 1 so cannot hit that case here. + */ +# endif + testl %eax, %eax + jnz L(prepare_loop) + ret + + .p2align 4,, 8 +L(ret_less_8_wcs): + setl %OFFSET_REG8 + negl %OFFSET_REG + movl %OFFSET_REG, %eax + xorl %r8d, %eax + ret + # else - subl $0xff, %ecx -# endif - jne L(last_vector) + cmpl $28, %eax + ja L(less_4_till_page) + + vmovd (%rdi), %xmm0 + vmovd (%rsi), %xmm1 + VPTESTM %xmm0, %xmm0, %k2 + VPCMP $0, %xmm1, %xmm0, %k1{%k2} + kmovd %k1, %ecx + subl $0xf, %ecx + jnz L(check_ret_vec_page_cross) - addl $8, %edx - addl $8, %eax # ifdef USE_AS_STRNCMP - /* Return 0 if the current offset (%rdx) >= the maximum offset - (%r11). */ - cmpq %r11, %rdx - jae L(zero) + cmpq $4, %rdx + jbe L(ret_zero_page_cross_slow_case1) # endif + movl $(28 / SIZE_OF_CHAR), %OFFSET_REG + subl %eax, %OFFSET_REG -L(cross_page_8bytes): - /* Less than 8 bytes to check, try 4 byte vector. */ - cmpl $(PAGE_SIZE - 4), %eax - jg L(cross_page_4bytes) - vmovd (%rdi, %rdx), %XMM0 - vmovd (%rsi, %rdx), %XMM1 - - VPTESTM %YMM0, %YMM0, %k2 - /* Each bit cleared in K1 represents a mismatch or a null CHAR - in XMM0 and XMM1. */ - VPCMP $0, %XMM1, %XMM0, %k1{%k2} + vmovd (%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %xmm0 + vmovd (%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %xmm1 + VPTESTM %xmm0, %xmm0, %k2 + VPCMP $0, %xmm1, %xmm0, %k1{%k2} kmovd %k1, %ecx -# ifdef USE_AS_WCSCMP - subl $0x1, %ecx -# else subl $0xf, %ecx -# endif - jne L(last_vector) + jnz L(check_ret_vec_page_cross) +# ifdef USE_AS_STRNCMP + addl $(4 / SIZE_OF_CHAR), %OFFSET_REG + subq %OFFSET_REG64, %rdx + jbe L(ret_zero_page_cross_slow_case1) + subq $-(CHAR_PER_VEC * 4), %rdx + + leaq -(VEC_SIZE * 4)(%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %rdi + leaq -(VEC_SIZE * 4)(%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %rsi +# else + leaq (4 - VEC_SIZE * 4)(%rdi, %OFFSET_REG64, SIZE_OF_CHAR), %rdi + leaq (4 - VEC_SIZE * 4)(%rsi, %OFFSET_REG64, SIZE_OF_CHAR), %rsi +# endif + jmp L(prepare_loop_aligned) + - addl $4, %edx # ifdef USE_AS_STRNCMP - /* Return 0 if the current offset (%rdx) >= the maximum offset - (%r11). */ - cmpq %r11, %rdx - jae L(zero) + .p2align 4,, 2 +L(ret_zero_page_cross_slow_case1): + xorl %eax, %eax + ret # endif -L(cross_page_4bytes): -# endif - /* Less than 4 bytes to check, try one byte/dword at a time. */ -# ifdef USE_AS_STRNCMP - cmpq %r11, %rdx - jae L(zero) -# endif -# ifdef USE_AS_WCSCMP - movl (%rdi, %rdx), %eax - movl (%rsi, %rdx), %ecx -# else - movzbl (%rdi, %rdx), %eax - movzbl (%rsi, %rdx), %ecx -# endif - testl %eax, %eax - jne L(cross_page_loop) + .p2align 4,, 10 +L(less_4_till_page): + subq %rdi, %rsi + /* Extremely slow byte comparison loop. */ +L(less_4_loop): + movzbl (%rdi), %eax + movzbl (%rsi, %rdi), %ecx subl %ecx, %eax + jnz L(ret_less_4_loop) + testl %ecx, %ecx + jz L(ret_zero_4_loop) +# ifdef USE_AS_STRNCMP + decq %rdx + jz L(ret_zero_4_loop) +# endif + incq %rdi + /* end condition is reach page boundary (rdi is aligned). */ + testl $31, %edi + jnz L(less_4_loop) + leaq -(VEC_SIZE * 4)(%rdi, %rsi), %rsi + addq $-(VEC_SIZE * 4), %rdi +# ifdef USE_AS_STRNCMP + subq $-(CHAR_PER_VEC * 4), %rdx +# endif + jmp L(prepare_loop_aligned) + +L(ret_zero_4_loop): + xorl %eax, %eax + ret +L(ret_less_4_loop): + xorl %r8d, %eax + subl %r8d, %eax ret -END (STRCMP) +# endif +END(STRCMP) #endif From patchwork Sun Jan 9 12:29:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Noah Goldstein X-Patchwork-Id: 49765 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 8B4A1388A022 for ; Sun, 9 Jan 2022 12:30:38 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 8B4A1388A022 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1641731438; bh=Oby0jMURajG5Novx1IjGH4unJQEfF4ApAPTrK+5aQsA=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=hh2sAAbyglwm5OlTysAxZDCOcs+LFo5LzVh5va44hKcf5xADnZC12p2J95QX0wVLR yyZN6kjGiPd4VeLtBldXjCrMOTsWLR7d2v6Jp9mLrd5rYq8X1WECUD+L5aVUpF/FaN c3O9esxpR6RIz3xGILSUvIlmoSR1xMDO6xKpWcjM= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by sourceware.org (Postfix) with ESMTPS id B7ADB388A00C for ; 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[73.202.60.99]) by smtp.googlemail.com with ESMTPSA id o27sm2979055pgm.1.2022.01.09.04.30.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Jan 2022 04:30:14 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH v1 3/5] string: remove stupid_[strcmp, strncmp, wcscmp, wcsncmp]. Date: Sun, 9 Jan 2022 06:29:45 -0600 Message-Id: <20220109122946.2754917-3-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220109122946.2754917-1-goldstein.w.n@gmail.com> References: <20220109122946.2754917-1-goldstein.w.n@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-12.0 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Noah Goldstein via Libc-alpha From: Noah Goldstein Reply-To: Noah Goldstein Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" These implementations are incorrect. There may be a mismatch in s1/s2 before invalid memory but no null CHAR / length boundary. Signed-off-by: Noah Goldstein --- string/test-strcmp.c | 35 ----------------------------------- string/test-strncmp.c | 34 ---------------------------------- 2 files changed, 69 deletions(-) diff --git a/string/test-strcmp.c b/string/test-strcmp.c index 3c75076fb8..97d7bf5043 100644 --- a/string/test-strcmp.c +++ b/string/test-strcmp.c @@ -34,7 +34,6 @@ # define STRLEN wcslen # define MEMCPY wmemcpy # define SIMPLE_STRCMP simple_wcscmp -# define STUPID_STRCMP stupid_wcscmp # define CHAR wchar_t # define UCHAR wchar_t # define CHARBYTES 4 @@ -64,25 +63,6 @@ simple_wcscmp (const wchar_t *s1, const wchar_t *s2) return c1 < c2 ? -1 : 1; } -int -stupid_wcscmp (const wchar_t *s1, const wchar_t *s2) -{ - size_t ns1 = wcslen (s1) + 1; - size_t ns2 = wcslen (s2) + 1; - size_t n = ns1 < ns2 ? ns1 : ns2; - int ret = 0; - - wchar_t c1, c2; - - while (n--) { - c1 = *s1++; - c2 = *s2++; - if ((ret = c1 < c2 ? -1 : c1 == c2 ? 0 : 1) != 0) - break; - } - return ret; -} - #else # include @@ -92,7 +72,6 @@ stupid_wcscmp (const wchar_t *s1, const wchar_t *s2) # define STRLEN strlen # define MEMCPY memcpy # define SIMPLE_STRCMP simple_strcmp -# define STUPID_STRCMP stupid_strcmp # define CHAR char # define UCHAR unsigned char # define CHARBYTES 1 @@ -113,24 +92,10 @@ simple_strcmp (const char *s1, const char *s2) return ret; } -int -stupid_strcmp (const char *s1, const char *s2) -{ - size_t ns1 = strlen (s1) + 1; - size_t ns2 = strlen (s2) + 1; - size_t n = ns1 < ns2 ? ns1 : ns2; - int ret = 0; - - while (n--) - if ((ret = *(unsigned char *) s1++ - *(unsigned char *) s2++) != 0) - break; - return ret; -} #endif typedef int (*proto_t) (const CHAR *, const CHAR *); -IMPL (STUPID_STRCMP, 1) IMPL (SIMPLE_STRCMP, 1) IMPL (STRCMP, 1) diff --git a/string/test-strncmp.c b/string/test-strncmp.c index e7d5edea39..61a283a0af 100644 --- a/string/test-strncmp.c +++ b/string/test-strncmp.c @@ -33,7 +33,6 @@ # define STRDUP wcsdup # define MEMCPY wmemcpy # define SIMPLE_STRNCMP simple_wcsncmp -# define STUPID_STRNCMP stupid_wcsncmp # define CHAR wchar_t # define UCHAR wchar_t # define CHARBYTES 4 @@ -57,25 +56,6 @@ simple_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n) return 0; } -int -stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n) -{ - wchar_t c1, c2; - size_t ns1 = wcsnlen (s1, n) + 1, ns2 = wcsnlen (s2, n) + 1; - - n = ns1 < n ? ns1 : n; - n = ns2 < n ? ns2 : n; - - while (n--) - { - c1 = *s1++; - c2 = *s2++; - if (c1 != c2) - return c1 > c2 ? 1 : -1; - } - return 0; -} - #else # define L(str) str # define STRNCMP strncmp @@ -83,7 +63,6 @@ stupid_wcsncmp (const CHAR *s1, const CHAR *s2, size_t n) # define STRDUP strdup # define MEMCPY memcpy # define SIMPLE_STRNCMP simple_strncmp -# define STUPID_STRNCMP stupid_strncmp # define CHAR char # define UCHAR unsigned char # define CHARBYTES 1 @@ -101,23 +80,10 @@ simple_strncmp (const char *s1, const char *s2, size_t n) return ret; } -int -stupid_strncmp (const char *s1, const char *s2, size_t n) -{ - size_t ns1 = strnlen (s1, n) + 1, ns2 = strnlen (s2, n) + 1; - int ret = 0; - - n = ns1 < n ? ns1 : n; - n = ns2 < n ? ns2 : n; - while (n-- && (ret = *(unsigned char *) s1++ - * (unsigned char *) s2++) == 0); - return ret; -} - #endif typedef int (*proto_t) (const CHAR *, const CHAR *, size_t); -IMPL (STUPID_STRNCMP, 0) IMPL (SIMPLE_STRNCMP, 0) IMPL (STRNCMP, 1) From patchwork Sun Jan 9 12:29:46 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Noah Goldstein X-Patchwork-Id: 49767 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id B9254388A023 for ; Sun, 9 Jan 2022 12:32:03 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org B9254388A023 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1641731523; bh=GDgcL30obvIG0os1NsvgRTqcF6OnVKQ8okm5kYoSCug=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=rzkzHcZWkd8q3agt95jAf2H4N6/xnEsWrJscy9JluYBbdtATOqb4Dk+rFhksn+ARf HsUqayfXJxnZ7cnhWSaveO5gu4jHJcwW1CPlZAf8tWhWViGV6VvG8YA/BFd8hvYzB7 wDWj+GmkH7+gXyHhveaUspr3fjsOu110Oux+Z7KU= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-pj1-x102c.google.com (mail-pj1-x102c.google.com [IPv6:2607:f8b0:4864:20::102c]) by sourceware.org (Postfix) with ESMTPS id 34906388A00C for ; Sun, 9 Jan 2022 12:30:17 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 34906388A00C Received: by mail-pj1-x102c.google.com with SMTP id rj2-20020a17090b3e8200b001b1944bad25so13182653pjb.5 for ; Sun, 09 Jan 2022 04:30:17 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=GDgcL30obvIG0os1NsvgRTqcF6OnVKQ8okm5kYoSCug=; b=BlI8fnG+9tWIcdm/daIjgqpV6FKam+shtq/3oXiuzzf5C9iwDosH/WMWQd0jT3U23/ PSVVujPfzlOwFbIunkmboIG4OkNjh2x7vF+vlzmVBh/JRDs8bdellBRrPMjHA3uodF46 IMAEsSY3Di3KFIHU2EjB5CxzOnq+Lxd1UMl1PEpdTxUKqjj4bm11pFRbTK3huOYRUGe4 j7bcGn3nPS9ZdPhbPD5JRerPOeZ9jXBGW0CYw++ENPlTDJ2yqXId7IaoS28DX/KfquE8 vdOle6VOOBphHvvai6HfNa/WfVoRQE/bBr0FQ3yTpEF5reLBix+BitoxrPUZQ3aBv/K6 sQpA== X-Gm-Message-State: AOAM531At6KZNtTIH7WCXZtjpz29YToqoUTd/cQ9fHSXbNaO6SfoKSzj /62oKZJW1DBcR79ETTkq5+IOc/3H3W0= X-Google-Smtp-Source: ABdhPJwdYxLuJzrOEZRsMM592uXaKi0pOBJOIft/CYZXlEpc9q9l8GwunNF+WlMUMkrhDtUYEsQ4aw== X-Received: by 2002:a17:902:e788:b0:149:1381:fd64 with SMTP id cp8-20020a170902e78800b001491381fd64mr69689946plb.109.1641731416090; Sun, 09 Jan 2022 04:30:16 -0800 (PST) Received: from localhost.localdomain (c-73-202-60-99.hsd1.ca.comcast.net. [73.202.60.99]) by smtp.googlemail.com with ESMTPSA id o27sm2979055pgm.1.2022.01.09.04.30.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Jan 2022 04:30:15 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH v1 4/5] string: Improve coverage in test-strcmp.c and test-strncmp.c Date: Sun, 9 Jan 2022 06:29:46 -0600 Message-Id: <20220109122946.2754917-4-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220109122946.2754917-1-goldstein.w.n@gmail.com> References: <20220109122946.2754917-1-goldstein.w.n@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-11.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Noah Goldstein via Libc-alpha From: Noah Goldstein Reply-To: Noah Goldstein Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Add additional test cases for small / medium sizes. Add tests in strncmp where `n` is near ULONG_MAX to test for overflow bugs in length handling. Signed-off-by: Noah Goldstein --- string/test-strcmp.c | 70 +++++++++++++++++++--- string/test-strncmp.c | 134 ++++++++++++++++++++++++++++++++++++++---- 2 files changed, 184 insertions(+), 20 deletions(-) diff --git a/string/test-strcmp.c b/string/test-strcmp.c index 97d7bf5043..eacbdc8857 100644 --- a/string/test-strcmp.c +++ b/string/test-strcmp.c @@ -16,6 +16,9 @@ License along with the GNU C Library; if not, see . */ +#define TEST_LEN (4096 * 3) +#define MIN_PAGE_SIZE (TEST_LEN + 2 * getpagesize ()) + #define TEST_MAIN #ifdef WIDE # define TEST_NAME "wcscmp" @@ -129,7 +132,7 @@ do_one_test (impl_t *impl, static void do_test (size_t align1, size_t align2, size_t len, int max_char, - int exp_result) + int exp_result) { size_t i; @@ -138,19 +141,22 @@ do_test (size_t align1, size_t align2, size_t len, int max_char, if (len == 0) return; - align1 &= 63; + align1 &= ~(CHARBYTES - 1); + align2 &= ~(CHARBYTES - 1); + + align1 &= getpagesize () - 1; if (align1 + (len + 1) * CHARBYTES >= page_size) return; - align2 &= 63; + align2 &= getpagesize () - 1; if (align2 + (len + 1) * CHARBYTES >= page_size) return; /* Put them close to the end of page. */ i = align1 + CHARBYTES * (len + 2); - s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1); + s1 = (CHAR *)(buf1 + ((page_size - i) / 16 * 16) + align1); i = align2 + CHARBYTES * (len + 2); - s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2); + s2 = (CHAR *)(buf2 + ((page_size - i) / 16 * 16) + align2); for (i = 0; i < len; i++) s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; @@ -161,9 +167,10 @@ do_test (size_t align1, size_t align2, size_t len, int max_char, s2[len - 1] -= exp_result; FOR_EACH_IMPL (impl, 0) - do_one_test (impl, s1, s2, exp_result); + do_one_test (impl, s1, s2, exp_result); } + static void do_random_tests (void) { @@ -385,7 +392,7 @@ check3 (void) int test_main (void) { - size_t i; + size_t i, j; test_init (); check(); @@ -426,6 +433,55 @@ test_main (void) do_test (2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1); } + for (j = 0; j < 160; ++j) + { + for (i = 0; i < TEST_LEN;) + { + do_test (getpagesize () - j - 1, 0, i, 127, 0); + do_test (getpagesize () - j - 1, 0, i, 127, 1); + do_test (getpagesize () - j - 1, 0, i, 127, -1); + + do_test (getpagesize () - j - 1, j, i, 127, 0); + do_test (getpagesize () - j - 1, j, i, 127, 1); + do_test (getpagesize () - j - 1, j, i, 127, -1); + + do_test (0, getpagesize () - j - 1, i, 127, 0); + do_test (0, getpagesize () - j - 1, i, 127, 1); + do_test (0, getpagesize () - j - 1, i, 127, -1); + + do_test (j, getpagesize () - j - 1, i, 127, 0); + do_test (j, getpagesize () - j - 1, i, 127, 1); + do_test (j, getpagesize () - j - 1, i, 127, -1); + + if (i < 32) + { + i += 1; + } + else if (i < 161) + { + i += 7; + } + else if (i + 161 < TEST_LEN) + { + i += 31; + i *= 17; + i /= 16; + if (i + 161 > TEST_LEN) + { + i = TEST_LEN - 160; + } + } + else if (i + 32 < TEST_LEN) + { + i += 7; + } + else + { + i += 1; + } + } + } + do_random_tests (); return ret; } diff --git a/string/test-strncmp.c b/string/test-strncmp.c index 61a283a0af..35492f1f68 100644 --- a/string/test-strncmp.c +++ b/string/test-strncmp.c @@ -16,6 +16,9 @@ License along with the GNU C Library; if not, see . */ +#define TEST_LEN (4096 * 3) +#define MIN_PAGE_SIZE (TEST_LEN + 2 * getpagesize ()) + #define TEST_MAIN #ifdef WIDE # define TEST_NAME "wcsncmp" @@ -166,10 +169,10 @@ do_test_limit (size_t align1, size_t align2, size_t len, size_t n, int max_char, } static void -do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char, - int exp_result) +do_test_n (size_t align1, size_t align2, size_t len, size_t n, int n_in_bounds, + int max_char, int exp_result) { - size_t i; + size_t i, buf_bound; CHAR *s1, *s2; align1 &= ~(CHARBYTES - 1); @@ -178,22 +181,28 @@ do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char, if (n == 0) return; - align1 &= 63; - if (align1 + (n + 1) * CHARBYTES >= page_size) + buf_bound = n_in_bounds ? n : len; + + align1 &= getpagesize () - 1; + if (align1 + (buf_bound + 1) * CHARBYTES >= page_size) return; - align2 &= 63; - if (align2 + (n + 1) * CHARBYTES >= page_size) + align2 &= getpagesize () - 1; + if (align2 + (buf_bound + 1) * CHARBYTES >= page_size) return; - s1 = (CHAR *) (buf1 + align1); - s2 = (CHAR *) (buf2 + align2); + s1 = (CHAR *)(buf1 + align1); + s2 = (CHAR *)(buf2 + align2); - for (i = 0; i < n; i++) + if (n_in_bounds) + { + s1[n] = 24 + exp_result; + s2[n] = 23; + } + + for (i = 0; i < buf_bound; i++) s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; - s1[n] = 24 + exp_result; - s2[n] = 23; s1[len] = 0; s2[len] = 0; if (exp_result < 0) @@ -207,6 +216,13 @@ do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char, do_one_test (impl, s1, s2, n, exp_result); } +static void +do_test (size_t align1, size_t align2, size_t len, size_t n, int max_char, + int exp_result) +{ + do_test_n (align1, align2, len, n, 1, max_char, exp_result); +} + static void do_page_test (size_t offset1, size_t offset2, CHAR *s2) { @@ -403,7 +419,7 @@ check3 (void) int test_main (void) { - size_t i; + size_t i, j; test_init (); @@ -470,6 +486,98 @@ test_main (void) do_test_limit (0, 0, 15 - i, 16 - i, 255, -1); } + for (j = 0; j < 160; ++j) + { + for (i = 0; i < TEST_LEN;) + { + do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, 0); + do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, 1); + do_test_n (getpagesize () - j - 1, 0, i, i + 1, 0, 127, -1); + + do_test_n (getpagesize () - j - 1, 0, i, i, 0, 127, 0); + do_test_n (getpagesize () - j - 1, 0, i, i - 1, 0, 127, 0); + + do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, 0); + do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, 1); + do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX, 0, 127, -1); + + do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX / 2, 0, 127, 0); + do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX / 2, 0, 127, 1); + do_test_n (getpagesize () - j - 1, 0, i, ULONG_MAX / 2, 0, 127, -1); + + do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, 0); + do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, 1); + do_test_n (getpagesize () - j - 1, j, i, i + 1, 0, 127, -1); + + do_test_n (getpagesize () - j - 1, j, i, i, 0, 127, 0); + do_test_n (getpagesize () - j - 1, j, i, i - 1, 0, 127, 0); + + do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, 0); + do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, 1); + do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX, 0, 127, -1); + + do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX / 2, 0, 127, 0); + do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX / 2, 0, 127, 1); + do_test_n (getpagesize () - j - 1, j, i, ULONG_MAX / 2, 0, 127, -1); + + do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, 0); + do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, 1); + do_test_n (0, getpagesize () - j - 1, i, i + 1, 0, 127, -1); + + do_test_n (0, getpagesize () - j - 1, i, i, 0, 127, 0); + do_test_n (0, getpagesize () - j - 1, i, i - 1, 0, 127, 0); + + do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 0); + do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 1); + do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, -1); + + do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX / 2, 0, 127, 0); + do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX / 2, 0, 127, 1); + do_test_n (0, getpagesize () - j - 1, i, ULONG_MAX / 2, 0, 127, -1); + + do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, 0); + do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, 1); + do_test_n (j, getpagesize () - j - 1, i, i + 1, 0, 127, -1); + + do_test_n (j, getpagesize () - j - 1, i, i, 0, 127, 0); + do_test_n (j, getpagesize () - j - 1, i, i - 1, 0, 127, 0); + + do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 0); + do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, 1); + do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX, 0, 127, -1); + + do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX / 2, 0, 127, 0); + do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX / 2, 0, 127, 1); + do_test_n (j, getpagesize () - j - 1, i, ULONG_MAX / 2, 0, 127, -1); + if (i < 32) + { + i += 1; + } + else if (i < 161) + { + i += 7; + } + else if (i + 161 < TEST_LEN) + { + i += 31; + i *= 17; + i /= 16; + if (i + 161 > TEST_LEN) + { + i = TEST_LEN - 160; + } + } + else if (i + 32 < TEST_LEN) + { + i += 7; + } + else + { + i += 1; + } + } + } + do_random_tests (); return ret; } From patchwork Sun Jan 9 12:29:47 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Noah Goldstein X-Patchwork-Id: 49768 Return-Path: X-Original-To: patchwork@sourceware.org Delivered-To: patchwork@sourceware.org Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id 6296B388A02B for ; Sun, 9 Jan 2022 12:32:50 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 6296B388A02B DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1641731570; bh=bY2VZ0Y5BMIhyq+ySmKAWBqkWf2JOc4fO3B1Z6wOFUU=; h=To:Subject:Date:In-Reply-To:References:List-Id:List-Unsubscribe: List-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To: From; b=TennBGsgeGukHm5sO630TNoog/9aEtk+JlXNb9kNJeywOAoubRLN9FkoZ50HVXy2q Dz/g7WRCE5XrYXhT8I9vM/LUgZcS9mfs2uB0lqqOj0do/EjHibMMUofsW5bLXXyeWJ aZLHvZ79PrxvtpB5cMNYXgwByL+cH8bRJvHY2jIY= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-pj1-x102f.google.com (mail-pj1-x102f.google.com [IPv6:2607:f8b0:4864:20::102f]) by sourceware.org (Postfix) with ESMTPS id 6F52D388A012 for ; 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[73.202.60.99]) by smtp.googlemail.com with ESMTPSA id o27sm2979055pgm.1.2022.01.09.04.30.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 09 Jan 2022 04:30:17 -0800 (PST) To: libc-alpha@sourceware.org Subject: [PATCH v1 5/5] benchtests: Add more coverage for strcmp and strncmp benchmarks Date: Sun, 9 Jan 2022 06:29:47 -0600 Message-Id: <20220109122946.2754917-5-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220109122946.2754917-1-goldstein.w.n@gmail.com> References: <20220109122946.2754917-1-goldstein.w.n@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-11.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, RCVD_IN_DNSWL_NONE, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-Patchwork-Original-From: Noah Goldstein via Libc-alpha From: Noah Goldstein Reply-To: Noah Goldstein Errors-To: libc-alpha-bounces+patchwork=sourceware.org@sourceware.org Sender: "Libc-alpha" Add more small and medium sized tests for strcmp and strncmp. As well for strcmp add option for more direct control of alignment. Previously alignment was being pushed to the end of the page. While this is the most difficult case to implement, it is far from the common case and so shouldn't be the only benchmark. Signed-off-by: Noah Goldstein --- benchtests/bench-strcmp.c | 142 ++++++++++++++++++++++++++----------- benchtests/bench-strncmp.c | 110 ++++++++++++++++++++-------- 2 files changed, 183 insertions(+), 69 deletions(-) diff --git a/benchtests/bench-strcmp.c b/benchtests/bench-strcmp.c index 387e76fcfb..3a60edfb15 100644 --- a/benchtests/bench-strcmp.c +++ b/benchtests/bench-strcmp.c @@ -99,8 +99,8 @@ do_one_test (json_ctx_t *json_ctx, impl_t *impl, } static void -do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, int - max_char, int exp_result) +do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, + int max_char, int exp_result, int at_end) { size_t i; @@ -109,19 +109,28 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, int if (len == 0) return; - align1 &= 63; + align1 &= ~(CHARBYTES - 1); + align2 &= ~(CHARBYTES - 1); + + align1 &= (getpagesize () - 1); if (align1 + (len + 1) * CHARBYTES >= page_size) return; - align2 &= 63; + align2 &= (getpagesize () - 1); if (align2 + (len + 1) * CHARBYTES >= page_size) return; /* Put them close to the end of page. */ - i = align1 + CHARBYTES * (len + 2); - s1 = (CHAR *) (buf1 + ((page_size - i) / 16 * 16) + align1); - i = align2 + CHARBYTES * (len + 2); - s2 = (CHAR *) (buf2 + ((page_size - i) / 16 * 16) + align2); + if (at_end) + { + i = align1 + CHARBYTES * (len + 2); + align1 = ((page_size - i) / 16 * 16) + align1; + i = align2 + CHARBYTES * (len + 2); + align2 = ((page_size - i) / 16 * 16) + align2; + } + + s1 = (CHAR *)(buf1 + align1); + s2 = (CHAR *)(buf2 + align2); for (i = 0; i < len; i++) s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; @@ -132,9 +141,9 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, int s2[len - 1] -= exp_result; json_element_object_begin (json_ctx); - json_attr_uint (json_ctx, "length", (double) len); - json_attr_uint (json_ctx, "align1", (double) align1); - json_attr_uint (json_ctx, "align2", (double) align2); + json_attr_uint (json_ctx, "length", (double)len); + json_attr_uint (json_ctx, "align1", (double)align1); + json_attr_uint (json_ctx, "align2", (double)align2); json_array_begin (json_ctx, "timings"); FOR_EACH_IMPL (impl, 0) @@ -202,7 +211,8 @@ int test_main (void) { json_ctx_t json_ctx; - size_t i; + size_t i, j, k; + size_t pg_sz = getpagesize (); test_init (); @@ -221,36 +231,88 @@ test_main (void) json_array_end (&json_ctx); json_array_begin (&json_ctx, "results"); - - for (i = 1; i < 32; ++i) - { - do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0); - do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1); - do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1); - } - - for (i = 1; i < 10 + CHARBYTESLOG; ++i) + for (k = 0; k < 2; ++k) { - do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 0); - do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 0); - do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 1); - do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 1); - do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, -1); - do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, -1); - do_test (&json_ctx, 0, CHARBYTES * i, 2 << i, MIDCHAR, 1); - do_test (&json_ctx, CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, LARGECHAR, 1); + for (i = 1; i < 32; ++i) + { + do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 0, k); + do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, 1, k); + do_test (&json_ctx, CHARBYTES * i, CHARBYTES * i, i, MIDCHAR, -1, k); + } + + for (i = 1; i <= 8192;) + { + /* No page crosses. */ + do_test (&json_ctx, 0, 0, i, MIDCHAR, 0, k); + do_test (&json_ctx, i * CHARBYTES, 0, i, MIDCHAR, 0, k); + do_test (&json_ctx, 0, i * CHARBYTES, i, MIDCHAR, 0, k); + + /* False page crosses. */ + do_test (&json_ctx, pg_sz / 2, pg_sz / 2 - CHARBYTES, i, MIDCHAR, 0, + k); + do_test (&json_ctx, pg_sz / 2 - CHARBYTES, pg_sz / 2, i, MIDCHAR, 0, + k); + + do_test (&json_ctx, pg_sz - (i * CHARBYTES), 0, i, MIDCHAR, 0, k); + do_test (&json_ctx, 0, pg_sz - (i * CHARBYTES), i, MIDCHAR, 0, k); + + /* Real page cross. */ + for (j = 16; j < 128; j += 16) + { + do_test (&json_ctx, pg_sz - j, 0, i, MIDCHAR, 0, k); + do_test (&json_ctx, 0, pg_sz - j, i, MIDCHAR, 0, k); + + do_test (&json_ctx, pg_sz - j, pg_sz - j / 2, i, MIDCHAR, 0, k); + do_test (&json_ctx, pg_sz - j / 2, pg_sz - j, i, MIDCHAR, 0, k); + } + + if (i < 32) + { + ++i; + } + else if (i < 160) + { + i += 8; + } + else if (i < 512) + { + i += 32; + } + else + { + i *= 2; + } + } + + for (i = 1; i < 10 + CHARBYTESLOG; ++i) + { + do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 0, k); + do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 0, k); + do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, 1, k); + do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, 1, k); + do_test (&json_ctx, 0, 0, 2 << i, MIDCHAR, -1, k); + do_test (&json_ctx, 0, 0, 2 << i, LARGECHAR, -1, k); + do_test (&json_ctx, 0, CHARBYTES * i, 2 << i, MIDCHAR, 1, k); + do_test (&json_ctx, CHARBYTES * i, CHARBYTES * (i + 1), 2 << i, + LARGECHAR, 1, k); + } + + for (i = 1; i < 8; ++i) + { + do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, + MIDCHAR, 0, k); + do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, + LARGECHAR, 0, k); + do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, + MIDCHAR, 1, k); + do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, + LARGECHAR, 1, k); + do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, + MIDCHAR, -1, k); + do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, + LARGECHAR, -1, k); + } } - - for (i = 1; i < 8; ++i) - { - do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 0); - do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 0); - do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, 1); - do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, 1); - do_test (&json_ctx, CHARBYTES * i, 2 * CHARBYTES * i, 8 << i, MIDCHAR, -1); - do_test (&json_ctx, 2 * CHARBYTES * i, CHARBYTES * i, 8 << i, LARGECHAR, -1); - } - do_test_page_boundary (&json_ctx); json_array_end (&json_ctx); diff --git a/benchtests/bench-strncmp.c b/benchtests/bench-strncmp.c index b7a01fde64..6673a53521 100644 --- a/benchtests/bench-strncmp.c +++ b/benchtests/bench-strncmp.c @@ -150,43 +150,43 @@ do_test (json_ctx_t *json_ctx, size_t align1, size_t align2, size_t len, size_t if (n == 0) return; - align1 &= 63; + align1 &= getpagesize () - 1; if (align1 + (n + 1) * CHARBYTES >= page_size) return; - align2 &= 7; + align2 &= getpagesize () - 1; if (align2 + (n + 1) * CHARBYTES >= page_size) return; json_element_object_begin (json_ctx); - json_attr_uint (json_ctx, "strlen", (double) len); - json_attr_uint (json_ctx, "len", (double) n); - json_attr_uint (json_ctx, "align1", (double) align1); - json_attr_uint (json_ctx, "align2", (double) align2); + json_attr_uint (json_ctx, "strlen", (double)len); + json_attr_uint (json_ctx, "len", (double)n); + json_attr_uint (json_ctx, "align1", (double)align1); + json_attr_uint (json_ctx, "align2", (double)align2); json_array_begin (json_ctx, "timings"); FOR_EACH_IMPL (impl, 0) - { - alloc_bufs (); - s1 = (CHAR *) (buf1 + align1); - s2 = (CHAR *) (buf2 + align2); - - for (i = 0; i < n; i++) - s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; - - s1[n] = 24 + exp_result; - s2[n] = 23; - s1[len] = 0; - s2[len] = 0; - if (exp_result < 0) - s2[len] = 32; - else if (exp_result > 0) - s1[len] = 64; - if (len >= n) - s2[n - 1] -= exp_result; + { + alloc_bufs (); + s1 = (CHAR *)(buf1 + align1); + s2 = (CHAR *)(buf2 + align2); + + for (i = 0; i < n; i++) + s1[i] = s2[i] = 1 + (23 << ((CHARBYTES - 1) * 8)) * i % max_char; + + s1[n] = 24 + exp_result; + s2[n] = 23; + s1[len] = 0; + s2[len] = 0; + if (exp_result < 0) + s2[len] = 32; + else if (exp_result > 0) + s1[len] = 64; + if (len >= n) + s2[n - 1] -= exp_result; - do_one_test (json_ctx, impl, s1, s2, n, exp_result); - } + do_one_test (json_ctx, impl, s1, s2, n, exp_result); + } json_array_end (json_ctx); json_element_object_end (json_ctx); @@ -319,7 +319,8 @@ int test_main (void) { json_ctx_t json_ctx; - size_t i; + size_t i, j, len; + size_t pg_sz = getpagesize (); test_init (); @@ -334,12 +335,12 @@ test_main (void) json_array_begin (&json_ctx, "ifuncs"); FOR_EACH_IMPL (impl, 0) - json_element_string (&json_ctx, impl->name); + json_element_string (&json_ctx, impl->name); json_array_end (&json_ctx); json_array_begin (&json_ctx, "results"); - for (i =0; i < 16; ++i) + for (i = 0; i < 16; ++i) { do_test (&json_ctx, 0, 0, 8, i, 127, 0); do_test (&json_ctx, 0, 0, 8, i, 127, -1); @@ -361,6 +362,57 @@ test_main (void) do_test (&json_ctx, i, 3 * i, 8, i, 255, -1); } + for (len = 0; len <= 128; len += 64) + { + for (i = 1; i <= 8192;) + { + /* No page crosses. */ + do_test (&json_ctx, 0, 0, i, i + len, 127, 0); + do_test (&json_ctx, i * CHARBYTES, 0, i, i + len, 127, 0); + do_test (&json_ctx, 0, i * CHARBYTES, i, i + len, 127, 0); + + /* False page crosses. */ + do_test (&json_ctx, pg_sz / 2, pg_sz / 2 - CHARBYTES, i, i + len, + 127, 0); + do_test (&json_ctx, pg_sz / 2 - CHARBYTES, pg_sz / 2, i, i + len, + 127, 0); + + do_test (&json_ctx, pg_sz - (i * CHARBYTES), 0, i, i + len, 127, + 0); + do_test (&json_ctx, 0, pg_sz - (i * CHARBYTES), i, i + len, 127, + 0); + + /* Real page cross. */ + for (j = 16; j < 128; j += 16) + { + do_test (&json_ctx, pg_sz - j, 0, i, i + len, 127, 0); + do_test (&json_ctx, 0, pg_sz - j, i, i + len, 127, 0); + + do_test (&json_ctx, pg_sz - j, pg_sz - j / 2, i, i + len, + 127, 0); + do_test (&json_ctx, pg_sz - j / 2, pg_sz - j, i, i + len, + 127, 0); + } + + if (i < 32) + { + ++i; + } + else if (i < 160) + { + i += 8; + } + else if (i < 256) + { + i += 32; + } + else + { + i *= 2; + } + } + } + for (i = 1; i < 8; ++i) { do_test (&json_ctx, 0, 0, 8 << i, 16 << i, 127, 0);