From patchwork Thu Apr 21 22:22:02 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Noah Goldstein X-Patchwork-Id: 53108 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 88AA03856DC7 for ; Thu, 21 Apr 2022 22:23:15 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 88AA03856DC7 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sourceware.org; s=default; t=1650579795; bh=XgThhXogtdPNBsHVY3n/5/nPzkcR3ugbjSd+sMAlJ8Q=; 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=ftuTBp3E6ULaQursWYhOpet/u6ID76jwc5PUHqh6Bu1RvqCYC+qFKmc8feLwF/wF7 L4xYsQhs4UlaPaBnKdGX7FvDvQW0AoKUtFiR6Cm2Q8TG4iEgegFyEVJWH7iiCs6X+n mEWjvqp786dH0oYrvsp4/+ey0WrV1oHfXhT0Y8VA= X-Original-To: libc-alpha@sourceware.org Delivered-To: libc-alpha@sourceware.org Received: from mail-qv1-xf2a.google.com (mail-qv1-xf2a.google.com [IPv6:2607:f8b0:4864:20::f2a]) by sourceware.org (Postfix) with ESMTPS id 361A53858C2C for ; Thu, 21 Apr 2022 22:22:13 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org 361A53858C2C Received: by mail-qv1-xf2a.google.com with SMTP id e17so4734504qvj.11 for ; Thu, 21 Apr 2022 15:22:13 -0700 (PDT) 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=XgThhXogtdPNBsHVY3n/5/nPzkcR3ugbjSd+sMAlJ8Q=; b=wLLeLXmovBuUNWWMvbszTDmUeYk3/UEGBbvZGUggQqr8r6YIYjnUFhcgVMLoEg0HlY OMOYDBDTlVrW+kbUgFEaTaVWx3vRVulJltF5sHR8wxhgA5iMRrCosMQ7hk3ACAJA1zxS LfpiKbiHNvk4sR95rIx5RKzmHCiZ0N2r2tVWf7iQ2IUObscF3adxZSQrWQUiOs6gewUP Xd9gXaTkGNM0CHFk1LgbapE5hGWao7BbkmI/N+S/xmrs6hqXPMNarnbzP9/iNVCZVroG F5wpt/ZmMELCviFz1iG93nE6hHtHhIqX0AsPjkFhe6lwe0cOEYKCdi1Oqo1R65WUclgs Pqjw== X-Gm-Message-State: AOAM5323kKhLD4MA84d+oJ7Dlh0ROs8a8Q14oISGinhltHPj5Xz5+X30 pMTekG5VAlm8tq6TKD8By/oeVUOyHFY= X-Google-Smtp-Source: ABdhPJzjDnWUADYFpk7DQRuOw9haXcViI6P5Q2M0QWoV+NEm4TAEmnmjeQDmrey24VcnkpSBoFDW2A== X-Received: by 2002:a0c:ed46:0:b0:444:3e69:767b with SMTP id v6-20020a0ced46000000b004443e69767bmr1533367qvq.71.1650579732167; Thu, 21 Apr 2022 15:22:12 -0700 (PDT) Received: from localhost.localdomain ([173.245.203.170]) by smtp.googlemail.com with ESMTPSA id l9-20020a05622a174900b002f34421b01csm206337qtk.23.2022.04.21.15.22.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 21 Apr 2022 15:22:11 -0700 (PDT) To: libc-alpha@sourceware.org Subject: [PATCH v2 2/4] x86: Optimize {str|wcs}rchr-sse2 Date: Thu, 21 Apr 2022 17:22:02 -0500 Message-Id: <20220421222204.3093130-2-goldstein.w.n@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220421222204.3093130-1-goldstein.w.n@gmail.com> References: <20220421031410.2142238-1-goldstein.w.n@gmail.com> <20220421222204.3093130-1-goldstein.w.n@gmail.com> MIME-Version: 1.0 X-Spam-Status: No, score=-10.5 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, FREEMAIL_FROM, GIT_PATCH_0, KAM_NUMSUBJECT, KAM_SHORT, 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" The new code unrolls the main loop slightly without adding too much overhead and minimizes the comparisons for the search CHAR. Geometric Mean of all benchmarks New / Old: 0.741 See email for all results. Full xcheck passes on x86_64 with and without multiarch enabled. --- sysdeps/x86_64/multiarch/strrchr-sse2.S | 2 +- sysdeps/x86_64/multiarch/wcsrchr-sse2.S | 3 +- sysdeps/x86_64/strrchr.S | 510 +++++++++++++++--------- sysdeps/x86_64/wcsrchr.S | 268 +------------ 4 files changed, 339 insertions(+), 444 deletions(-) diff --git a/sysdeps/x86_64/multiarch/strrchr-sse2.S b/sysdeps/x86_64/multiarch/strrchr-sse2.S index db1b44c23c..866396e947 100644 --- a/sysdeps/x86_64/multiarch/strrchr-sse2.S +++ b/sysdeps/x86_64/multiarch/strrchr-sse2.S @@ -17,7 +17,7 @@ . */ #if IS_IN (libc) -# define strrchr __strrchr_sse2 +# define STRRCHR __strrchr_sse2 # undef weak_alias # define weak_alias(strrchr, rindex) diff --git a/sysdeps/x86_64/multiarch/wcsrchr-sse2.S b/sysdeps/x86_64/multiarch/wcsrchr-sse2.S index 78d1ca6553..69d2f3cdb1 100644 --- a/sysdeps/x86_64/multiarch/wcsrchr-sse2.S +++ b/sysdeps/x86_64/multiarch/wcsrchr-sse2.S @@ -17,7 +17,6 @@ . */ #if IS_IN (libc) -# define wcsrchr __wcsrchr_sse2 +# define STRRCHR __wcsrchr_sse2 #endif - #include "../wcsrchr.S" diff --git a/sysdeps/x86_64/strrchr.S b/sysdeps/x86_64/strrchr.S index 50d886713e..6efb25c880 100644 --- a/sysdeps/x86_64/strrchr.S +++ b/sysdeps/x86_64/strrchr.S @@ -19,210 +19,360 @@ #include +#ifndef STRRCHR +# define STRRCHR strrchr +#endif + +#ifdef USE_AS_WCSRCHR +# define PCMPEQ pcmpeqd +# define CHAR_SIZE 4 +# define PMINU pminud +#else +# define PCMPEQ pcmpeqb +# define CHAR_SIZE 1 +# define PMINU pminub +#endif + +#define PAGE_SIZE 4096 +#define VEC_SIZE 16 + .text -ENTRY (strrchr) - movd %esi, %xmm1 +ENTRY(STRRCHR) + movd %esi, %xmm0 movq %rdi, %rax - andl $4095, %eax - punpcklbw %xmm1, %xmm1 - cmpq $4032, %rax - punpcklwd %xmm1, %xmm1 - pshufd $0, %xmm1, %xmm1 + andl $(PAGE_SIZE - 1), %eax +#ifndef USE_AS_WCSRCHR + punpcklbw %xmm0, %xmm0 + punpcklwd %xmm0, %xmm0 +#endif + pshufd $0, %xmm0, %xmm0 + cmpl $(PAGE_SIZE - VEC_SIZE), %eax ja L(cross_page) - movdqu (%rdi), %xmm0 + +L(cross_page_continue): + movups (%rdi), %xmm1 pxor %xmm2, %xmm2 - movdqa %xmm0, %xmm3 - pcmpeqb %xmm1, %xmm0 - pcmpeqb %xmm2, %xmm3 - pmovmskb %xmm0, %ecx - pmovmskb %xmm3, %edx - testq %rdx, %rdx - je L(next_48_bytes) - leaq -1(%rdx), %rax - xorq %rdx, %rax - andq %rcx, %rax - je L(exit) - bsrq %rax, %rax + PCMPEQ %xmm1, %xmm2 + pmovmskb %xmm2, %ecx + testl %ecx, %ecx + jz L(aligned_more) + + PCMPEQ %xmm0, %xmm1 + pmovmskb %xmm1, %eax + leal -1(%rcx), %edx + xorl %edx, %ecx + andl %ecx, %eax + jz L(ret0) + bsrl %eax, %eax addq %rdi, %rax + /* We are off by 3 for wcsrchr if search CHAR is non-zero. If + search CHAR is zero we are correct. Either way `andq + -CHAR_SIZE, %rax` gets the correct result. */ +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif +L(ret0): ret + /* Returns for first vec x1/x2 have hard coded backward search + path for earlier matches. */ .p2align 4 -L(next_48_bytes): - movdqu 16(%rdi), %xmm4 - movdqa %xmm4, %xmm5 - movdqu 32(%rdi), %xmm3 - pcmpeqb %xmm1, %xmm4 - pcmpeqb %xmm2, %xmm5 - movdqu 48(%rdi), %xmm0 - pmovmskb %xmm5, %edx - movdqa %xmm3, %xmm5 - pcmpeqb %xmm1, %xmm3 - pcmpeqb %xmm2, %xmm5 - pcmpeqb %xmm0, %xmm2 - salq $16, %rdx - pmovmskb %xmm3, %r8d - pmovmskb %xmm5, %eax - pmovmskb %xmm2, %esi - salq $32, %r8 - salq $32, %rax - pcmpeqb %xmm1, %xmm0 - orq %rdx, %rax - movq %rsi, %rdx - pmovmskb %xmm4, %esi - salq $48, %rdx - salq $16, %rsi - orq %r8, %rsi - orq %rcx, %rsi - pmovmskb %xmm0, %ecx - salq $48, %rcx - orq %rcx, %rsi - orq %rdx, %rax - je L(loop_header2) - leaq -1(%rax), %rcx - xorq %rax, %rcx - andq %rcx, %rsi - je L(exit) - bsrq %rsi, %rsi - leaq (%rdi,%rsi), %rax +L(first_vec_x0_test): + PCMPEQ %xmm0, %xmm1 + pmovmskb %xmm1, %eax + testl %eax, %eax + jz L(ret0) + bsrl %eax, %eax + addq %r8, %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif ret .p2align 4 -L(loop_header2): - testq %rsi, %rsi - movq %rdi, %rcx - je L(no_c_found) -L(loop_header): - addq $64, %rdi - pxor %xmm7, %xmm7 - andq $-64, %rdi - jmp L(loop_entry) +L(first_vec_x1): + PCMPEQ %xmm0, %xmm2 + pmovmskb %xmm2, %eax + leal -1(%rcx), %edx + xorl %edx, %ecx + andl %ecx, %eax + jz L(first_vec_x0_test) + bsrl %eax, %eax + leaq (VEC_SIZE)(%rdi, %rax), %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif + ret .p2align 4 -L(loop64): - testq %rdx, %rdx - cmovne %rdx, %rsi - cmovne %rdi, %rcx - addq $64, %rdi -L(loop_entry): - movdqa 32(%rdi), %xmm3 - pxor %xmm6, %xmm6 - movdqa 48(%rdi), %xmm2 - movdqa %xmm3, %xmm0 - movdqa 16(%rdi), %xmm4 - pminub %xmm2, %xmm0 - movdqa (%rdi), %xmm5 - pminub %xmm4, %xmm0 - pminub %xmm5, %xmm0 - pcmpeqb %xmm7, %xmm0 - pmovmskb %xmm0, %eax - movdqa %xmm5, %xmm0 - pcmpeqb %xmm1, %xmm0 - pmovmskb %xmm0, %r9d - movdqa %xmm4, %xmm0 - pcmpeqb %xmm1, %xmm0 - pmovmskb %xmm0, %edx - movdqa %xmm3, %xmm0 - pcmpeqb %xmm1, %xmm0 - salq $16, %rdx - pmovmskb %xmm0, %r10d - movdqa %xmm2, %xmm0 - pcmpeqb %xmm1, %xmm0 - salq $32, %r10 - orq %r10, %rdx - pmovmskb %xmm0, %r8d - orq %r9, %rdx - salq $48, %r8 - orq %r8, %rdx +L(first_vec_x1_test): + PCMPEQ %xmm0, %xmm2 + pmovmskb %xmm2, %eax testl %eax, %eax - je L(loop64) - pcmpeqb %xmm6, %xmm4 - pcmpeqb %xmm6, %xmm3 - pcmpeqb %xmm6, %xmm5 - pmovmskb %xmm4, %eax - pmovmskb %xmm3, %r10d - pcmpeqb %xmm6, %xmm2 - pmovmskb %xmm5, %r9d - salq $32, %r10 - salq $16, %rax - pmovmskb %xmm2, %r8d - orq %r10, %rax - orq %r9, %rax - salq $48, %r8 - orq %r8, %rax - leaq -1(%rax), %r8 - xorq %rax, %r8 - andq %r8, %rdx - cmovne %rdi, %rcx - cmovne %rdx, %rsi - bsrq %rsi, %rsi - leaq (%rcx,%rsi), %rax + jz L(first_vec_x0_test) + bsrl %eax, %eax + leaq (VEC_SIZE)(%rdi, %rax), %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif + ret + + .p2align 4 +L(first_vec_x2): + PCMPEQ %xmm0, %xmm3 + pmovmskb %xmm3, %eax + leal -1(%rcx), %edx + xorl %edx, %ecx + andl %ecx, %eax + jz L(first_vec_x1_test) + bsrl %eax, %eax + leaq (VEC_SIZE * 2)(%rdi, %rax), %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif + ret + + .p2align 4 +L(aligned_more): + /* Save original pointer if match was in VEC 0. */ + movq %rdi, %r8 + andq $-VEC_SIZE, %rdi + + movaps VEC_SIZE(%rdi), %xmm2 + pxor %xmm3, %xmm3 + PCMPEQ %xmm2, %xmm3 + pmovmskb %xmm3, %ecx + testl %ecx, %ecx + jnz L(first_vec_x1) + + movaps (VEC_SIZE * 2)(%rdi), %xmm3 + pxor %xmm4, %xmm4 + PCMPEQ %xmm3, %xmm4 + pmovmskb %xmm4, %ecx + testl %ecx, %ecx + jnz L(first_vec_x2) + + addq $VEC_SIZE, %rdi + /* Save pointer again before realigning. */ + movq %rdi, %rsi + andq $-(VEC_SIZE * 2), %rdi + .p2align 4 +L(first_loop): + /* Do 2x VEC at a time. */ + movaps (VEC_SIZE * 2)(%rdi), %xmm4 + movaps (VEC_SIZE * 3)(%rdi), %xmm5 + /* If SSE2 no pminud so wcsrchr needs seperate logic for + detecting zero. Note if this is found to be a bottleneck it + may be worth adding an SSE4.1 wcsrchr implementation. */ +#ifdef USE_AS_WCSRCHR + movaps %xmm5, %xmm6 + pxor %xmm8, %xmm8 + + PCMPEQ %xmm8, %xmm5 + PCMPEQ %xmm4, %xmm8 + por %xmm5, %xmm8 +#else + movaps %xmm5, %xmm6 + PMINU %xmm4, %xmm5 +#endif + + movaps %xmm4, %xmm9 + PCMPEQ %xmm0, %xmm4 + PCMPEQ %xmm0, %xmm6 + movaps %xmm6, %xmm7 + por %xmm4, %xmm6 +#ifndef USE_AS_WCSRCHR + pxor %xmm8, %xmm8 + PCMPEQ %xmm5, %xmm8 +#endif + pmovmskb %xmm8, %ecx + pmovmskb %xmm6, %eax + + addq $(VEC_SIZE * 2), %rdi + /* Use `addl` 1) so we can undo it with `subl` and 2) it can + macro-fuse with `jz`. */ + addl %ecx, %eax + jz L(first_loop) + + /* Check if there is zero match. */ + testl %ecx, %ecx + jz L(second_loop_match) + + /* Check if there was a match in last iteration. */ + subl %ecx, %eax + jnz L(new_match) + +L(first_loop_old_match): + PCMPEQ %xmm0, %xmm2 + PCMPEQ %xmm0, %xmm3 + pmovmskb %xmm2, %ecx + pmovmskb %xmm3, %eax + addl %eax, %ecx + jz L(first_vec_x0_test) + /* NB: We could move this shift to before the branch and save a + bit of code size / performance on the fall through. The + branch leads to the null case which generally seems hotter + than char in first 3x VEC. */ + sall $16, %eax + orl %ecx, %eax + + bsrl %eax, %eax + addq %rsi, %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif + ret + + .p2align 4 +L(new_match): + pxor %xmm6, %xmm6 + PCMPEQ %xmm9, %xmm6 + pmovmskb %xmm6, %eax + sall $16, %ecx + orl %eax, %ecx + + /* We can't reuse either of the old comparisons as since we mask + of zeros after first zero (instead of using the full + comparison) we can't gurantee no interference between match + after end of string and valid match. */ + pmovmskb %xmm4, %eax + pmovmskb %xmm7, %edx + sall $16, %edx + orl %edx, %eax + + leal -1(%ecx), %edx + xorl %edx, %ecx + andl %ecx, %eax + jz L(first_loop_old_match) + bsrl %eax, %eax + addq %rdi, %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif ret + /* Save minimum state for getting most recent match. We can + throw out all previous work. */ .p2align 4 -L(no_c_found): - movl $1, %esi - xorl %ecx, %ecx - jmp L(loop_header) +L(second_loop_match): + movq %rdi, %rsi + movaps %xmm4, %xmm2 + movaps %xmm7, %xmm3 .p2align 4 -L(exit): - xorl %eax, %eax +L(second_loop): + movaps (VEC_SIZE * 2)(%rdi), %xmm4 + movaps (VEC_SIZE * 3)(%rdi), %xmm5 + /* If SSE2 no pminud so wcsrchr needs seperate logic for + detecting zero. Note if this is found to be a bottleneck it + may be worth adding an SSE4.1 wcsrchr implementation. */ +#ifdef USE_AS_WCSRCHR + movaps %xmm5, %xmm6 + pxor %xmm8, %xmm8 + + PCMPEQ %xmm8, %xmm5 + PCMPEQ %xmm4, %xmm8 + por %xmm5, %xmm8 +#else + movaps %xmm5, %xmm6 + PMINU %xmm4, %xmm5 +#endif + + movaps %xmm4, %xmm9 + PCMPEQ %xmm0, %xmm4 + PCMPEQ %xmm0, %xmm6 + movaps %xmm6, %xmm7 + por %xmm4, %xmm6 +#ifndef USE_AS_WCSRCHR + pxor %xmm8, %xmm8 + PCMPEQ %xmm5, %xmm8 +#endif + + pmovmskb %xmm8, %ecx + pmovmskb %xmm6, %eax + + addq $(VEC_SIZE * 2), %rdi + /* Either null term or new occurence of CHAR. */ + addl %ecx, %eax + jz L(second_loop) + + /* No null term so much be new occurence of CHAR. */ + testl %ecx, %ecx + jz L(second_loop_match) + + + subl %ecx, %eax + jnz L(second_loop_new_match) + +L(second_loop_old_match): + pmovmskb %xmm2, %ecx + pmovmskb %xmm3, %eax + sall $16, %eax + orl %ecx, %eax + bsrl %eax, %eax + addq %rsi, %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif ret .p2align 4 +L(second_loop_new_match): + pxor %xmm6, %xmm6 + PCMPEQ %xmm9, %xmm6 + pmovmskb %xmm6, %eax + sall $16, %ecx + orl %eax, %ecx + + /* We can't reuse either of the old comparisons as since we mask + of zeros after first zero (instead of using the full + comparison) we can't gurantee no interference between match + after end of string and valid match. */ + pmovmskb %xmm4, %eax + pmovmskb %xmm7, %edx + sall $16, %edx + orl %edx, %eax + + leal -1(%ecx), %edx + xorl %edx, %ecx + andl %ecx, %eax + jz L(second_loop_old_match) + bsrl %eax, %eax + addq %rdi, %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif + ret + + .p2align 4,, 4 L(cross_page): - movq %rdi, %rax - pxor %xmm0, %xmm0 - andq $-64, %rax - movdqu (%rax), %xmm5 - movdqa %xmm5, %xmm6 - movdqu 16(%rax), %xmm4 - pcmpeqb %xmm1, %xmm5 - pcmpeqb %xmm0, %xmm6 - movdqu 32(%rax), %xmm3 - pmovmskb %xmm6, %esi - movdqa %xmm4, %xmm6 - movdqu 48(%rax), %xmm2 - pcmpeqb %xmm1, %xmm4 - pcmpeqb %xmm0, %xmm6 - pmovmskb %xmm6, %edx - movdqa %xmm3, %xmm6 - pcmpeqb %xmm1, %xmm3 - pcmpeqb %xmm0, %xmm6 - pcmpeqb %xmm2, %xmm0 - salq $16, %rdx - pmovmskb %xmm3, %r9d - pmovmskb %xmm6, %r8d - pmovmskb %xmm0, %ecx - salq $32, %r9 - salq $32, %r8 - pcmpeqb %xmm1, %xmm2 - orq %r8, %rdx - salq $48, %rcx - pmovmskb %xmm5, %r8d - orq %rsi, %rdx - pmovmskb %xmm4, %esi - orq %rcx, %rdx - pmovmskb %xmm2, %ecx - salq $16, %rsi - salq $48, %rcx - orq %r9, %rsi - orq %r8, %rsi - orq %rcx, %rsi + movq %rdi, %rsi + andq $-VEC_SIZE, %rsi + movaps (%rsi), %xmm1 + pxor %xmm2, %xmm2 + PCMPEQ %xmm1, %xmm2 + pmovmskb %xmm2, %edx movl %edi, %ecx - subl %eax, %ecx - shrq %cl, %rdx - shrq %cl, %rsi - testq %rdx, %rdx - je L(loop_header2) - leaq -1(%rdx), %rax - xorq %rdx, %rax - andq %rax, %rsi - je L(exit) - bsrq %rsi, %rax + andl $(VEC_SIZE - 1), %ecx + sarl %cl, %edx + jz L(cross_page_continue) + PCMPEQ %xmm0, %xmm1 + pmovmskb %xmm1, %eax + sarl %cl, %eax + leal -1(%rdx), %ecx + xorl %edx, %ecx + andl %ecx, %eax + jz L(ret1) + bsrl %eax, %eax addq %rdi, %rax +#ifdef USE_AS_WCSRCHR + andq $-CHAR_SIZE, %rax +#endif +L(ret1): ret -END (strrchr) +END(STRRCHR) -weak_alias (strrchr, rindex) -libc_hidden_builtin_def (strrchr) +#ifndef USE_AS_WCSRCHR + weak_alias (STRRCHR, rindex) + libc_hidden_builtin_def (STRRCHR) +#endif diff --git a/sysdeps/x86_64/wcsrchr.S b/sysdeps/x86_64/wcsrchr.S index 61552954de..2b80efc5ef 100644 --- a/sysdeps/x86_64/wcsrchr.S +++ b/sysdeps/x86_64/wcsrchr.S @@ -1,4 +1,4 @@ -/* wcsrchr with SSSE3 +/* wcsrchr optimized with SSE2. Copyright (C) 2011-2022 Free Software Foundation, Inc. This file is part of the GNU C Library. @@ -16,266 +16,12 @@ License along with the GNU C Library; if not, see . */ -#include - .text -ENTRY (wcsrchr) +#define USE_AS_WCSRCHR 1 +#define NO_PMINU 1 - movd %rsi, %xmm1 - mov %rdi, %rcx - punpckldq %xmm1, %xmm1 - pxor %xmm2, %xmm2 - punpckldq %xmm1, %xmm1 - and $63, %rcx - cmp $48, %rcx - ja L(crosscache) +#ifndef STRRCHR +# define STRRCHR wcsrchr +#endif - movdqu (%rdi), %xmm0 - pcmpeqd %xmm0, %xmm2 - pcmpeqd %xmm1, %xmm0 - pmovmskb %xmm2, %rcx - pmovmskb %xmm0, %rax - add $16, %rdi - - test %rax, %rax - jnz L(unaligned_match1) - - test %rcx, %rcx - jnz L(return_null) - - and $-16, %rdi - xor %r8, %r8 - jmp L(loop) - - .p2align 4 -L(unaligned_match1): - test %rcx, %rcx - jnz L(prolog_find_zero_1) - - mov %rax, %r8 - mov %rdi, %rsi - and $-16, %rdi - jmp L(loop) - - .p2align 4 -L(crosscache): - and $15, %rcx - and $-16, %rdi - pxor %xmm3, %xmm3 - movdqa (%rdi), %xmm0 - pcmpeqd %xmm0, %xmm3 - pcmpeqd %xmm1, %xmm0 - pmovmskb %xmm3, %rdx - pmovmskb %xmm0, %rax - shr %cl, %rdx - shr %cl, %rax - add $16, %rdi - - test %rax, %rax - jnz L(unaligned_match) - - test %rdx, %rdx - jnz L(return_null) - - xor %r8, %r8 - jmp L(loop) - - .p2align 4 -L(unaligned_match): - test %rdx, %rdx - jnz L(prolog_find_zero) - - mov %rax, %r8 - lea (%rdi, %rcx), %rsi - -/* Loop start on aligned string. */ - .p2align 4 -L(loop): - movdqa (%rdi), %xmm0 - pcmpeqd %xmm0, %xmm2 - add $16, %rdi - pcmpeqd %xmm1, %xmm0 - pmovmskb %xmm2, %rcx - pmovmskb %xmm0, %rax - or %rax, %rcx - jnz L(matches) - - movdqa (%rdi), %xmm3 - pcmpeqd %xmm3, %xmm2 - add $16, %rdi - pcmpeqd %xmm1, %xmm3 - pmovmskb %xmm2, %rcx - pmovmskb %xmm3, %rax - or %rax, %rcx - jnz L(matches) - - movdqa (%rdi), %xmm4 - pcmpeqd %xmm4, %xmm2 - add $16, %rdi - pcmpeqd %xmm1, %xmm4 - pmovmskb %xmm2, %rcx - pmovmskb %xmm4, %rax - or %rax, %rcx - jnz L(matches) - - movdqa (%rdi), %xmm5 - pcmpeqd %xmm5, %xmm2 - add $16, %rdi - pcmpeqd %xmm1, %xmm5 - pmovmskb %xmm2, %rcx - pmovmskb %xmm5, %rax - or %rax, %rcx - jz L(loop) - - .p2align 4 -L(matches): - test %rax, %rax - jnz L(match) -L(return_value): - test %r8, %r8 - jz L(return_null) - mov %r8, %rax - mov %rsi, %rdi - - test $15 << 4, %ah - jnz L(match_fourth_wchar) - test %ah, %ah - jnz L(match_third_wchar) - test $15 << 4, %al - jnz L(match_second_wchar) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(match): - pmovmskb %xmm2, %rcx - test %rcx, %rcx - jnz L(find_zero) - mov %rax, %r8 - mov %rdi, %rsi - jmp L(loop) - - .p2align 4 -L(find_zero): - test $15, %cl - jnz L(find_zero_in_first_wchar) - test %cl, %cl - jnz L(find_zero_in_second_wchar) - test $15, %ch - jnz L(find_zero_in_third_wchar) - - and $1 << 13 - 1, %rax - jz L(return_value) - - test $15 << 4, %ah - jnz L(match_fourth_wchar) - test %ah, %ah - jnz L(match_third_wchar) - test $15 << 4, %al - jnz L(match_second_wchar) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(find_zero_in_first_wchar): - test $1, %rax - jz L(return_value) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(find_zero_in_second_wchar): - and $1 << 5 - 1, %rax - jz L(return_value) - - test $15 << 4, %al - jnz L(match_second_wchar) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(find_zero_in_third_wchar): - and $1 << 9 - 1, %rax - jz L(return_value) - - test %ah, %ah - jnz L(match_third_wchar) - test $15 << 4, %al - jnz L(match_second_wchar) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(prolog_find_zero): - add %rcx, %rdi - mov %rdx, %rcx -L(prolog_find_zero_1): - test $15, %cl - jnz L(prolog_find_zero_in_first_wchar) - test %cl, %cl - jnz L(prolog_find_zero_in_second_wchar) - test $15, %ch - jnz L(prolog_find_zero_in_third_wchar) - - and $1 << 13 - 1, %rax - jz L(return_null) - - test $15 << 4, %ah - jnz L(match_fourth_wchar) - test %ah, %ah - jnz L(match_third_wchar) - test $15 << 4, %al - jnz L(match_second_wchar) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(prolog_find_zero_in_first_wchar): - test $1, %rax - jz L(return_null) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(prolog_find_zero_in_second_wchar): - and $1 << 5 - 1, %rax - jz L(return_null) - - test $15 << 4, %al - jnz L(match_second_wchar) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(prolog_find_zero_in_third_wchar): - and $1 << 9 - 1, %rax - jz L(return_null) - - test %ah, %ah - jnz L(match_third_wchar) - test $15 << 4, %al - jnz L(match_second_wchar) - lea -16(%rdi), %rax - ret - - .p2align 4 -L(match_second_wchar): - lea -12(%rdi), %rax - ret - - .p2align 4 -L(match_third_wchar): - lea -8(%rdi), %rax - ret - - .p2align 4 -L(match_fourth_wchar): - lea -4(%rdi), %rax - ret - - .p2align 4 -L(return_null): - xor %rax, %rax - ret - -END (wcsrchr) +#include "../strrchr.S"