[3/7] Replace %xmm[8-12] with %xmm[0-4]

  Since ld.so preserves vector registers now, we can use %xmm[0-4] to
avoid the REX prefix.

OK for master?

H.J.
---
	* sysdeps/x86_64/strlen.S: Replace %xmm[8-12] with %xmm[0-4].
---
 sysdeps/x86_64/strlen.S | 94 ++++++++++++++++++++++++-------------------------
 1 file changed, 47 insertions(+), 47 deletions(-)
  

On Tue, Aug 25, 2015 at 05:22:47AM -0700, H.J. Lu wrote:
> Since ld.so preserves vector registers now, we can use %xmm[0-4] to
> avoid the REX prefix.
> 
> OK for master?
>
also ok but I have new strlen.
 
> H.J.
> ---
> 	* sysdeps/x86_64/strlen.S: Replace %xmm[8-12] with %xmm[0-4].
> ---
>  sysdeps/x86_64/strlen.S | 94 ++++++++++++++++++++++++-------------------------
>  1 file changed, 47 insertions(+), 47 deletions(-)
> 
> diff --git a/sysdeps/x86_64/strlen.S b/sysdeps/x86_64/strlen.S
> index c382c8d..0725333 100644
> --- a/sysdeps/x86_64/strlen.S
> +++ b/sysdeps/x86_64/strlen.S
> @@ -20,7 +20,7 @@
>  
>  /* Long lived register in strlen(s), strnlen(s, n) are:
>  
> -	%xmm11 - zero
> +	%xmm3 - zero
>  	%rdi   - s
>  	%r10  (s+n) & (~(64-1))
>  	%r11   s+n
> @@ -32,14 +32,14 @@ ENTRY(strlen)
>  
>  /* Test 64 bytes from %rax for zero. Save result as bitmask in %rdx.  */
>  #define FIND_ZERO	\
> -	pcmpeqb	(%rax), %xmm8;	\
> -	pcmpeqb	16(%rax), %xmm9;	\
> -	pcmpeqb	32(%rax), %xmm10;	\
> -	pcmpeqb	48(%rax), %xmm11;	\
> -	pmovmskb	%xmm8, %esi;	\
> -	pmovmskb	%xmm9, %edx;	\
> -	pmovmskb	%xmm10, %r8d;	\
> -	pmovmskb	%xmm11, %ecx;	\
> +	pcmpeqb	(%rax), %xmm0;	\
> +	pcmpeqb	16(%rax), %xmm1;	\
> +	pcmpeqb	32(%rax), %xmm2;	\
> +	pcmpeqb	48(%rax), %xmm3;	\
> +	pmovmskb	%xmm0, %esi;	\
> +	pmovmskb	%xmm1, %edx;	\
> +	pmovmskb	%xmm2, %r8d;	\
> +	pmovmskb	%xmm3, %ecx;	\
>  	salq	$16, %rdx;	\
>  	salq	$16, %rcx;	\
>  	orq	%rsi, %rdx;	\
> @@ -63,10 +63,10 @@ L(n_nonzero):
>  	mov	%rsi, %r11
>  #endif
>  
> -	pxor	%xmm8, %xmm8
> -	pxor	%xmm9, %xmm9
> -	pxor	%xmm10, %xmm10
> -	pxor	%xmm11, %xmm11
> +	pxor	%xmm0, %xmm0
> +	pxor	%xmm1, %xmm1
> +	pxor	%xmm2, %xmm2
> +	pxor	%xmm3, %xmm3
>  	movq	%rdi, %rax
>  	movq	%rdi, %rcx
>  	andq	$4095, %rcx
> @@ -103,9 +103,9 @@ L(n_nonzero):
>  	FIND_ZERO
>  #else
>  	/* Test first 16 bytes unaligned.  */
> -	movdqu	(%rax), %xmm12
> -	pcmpeqb	%xmm8, %xmm12
> -	pmovmskb	%xmm12, %edx
> +	movdqu	(%rax), %xmm4
> +	pcmpeqb	%xmm0, %xmm4
> +	pmovmskb	%xmm4, %edx
>  	test	%edx, %edx
>  	je 	L(next48_bytes)
>  	bsf	%edx, %eax /* If eax is zeroed 16bit bsf can be used.  */
> @@ -114,12 +114,12 @@ L(n_nonzero):
>  L(next48_bytes):
>  /* Same as FIND_ZERO except we do not check first 16 bytes.  */
>  	andq	$-16, %rax
> -	pcmpeqb 16(%rax), %xmm9
> -	pcmpeqb 32(%rax), %xmm10
> -	pcmpeqb 48(%rax), %xmm11
> -	pmovmskb	%xmm9, %edx
> -	pmovmskb	%xmm10, %r8d
> -	pmovmskb	%xmm11, %ecx
> +	pcmpeqb 16(%rax), %xmm1
> +	pcmpeqb 32(%rax), %xmm2
> +	pcmpeqb 48(%rax), %xmm3
> +	pmovmskb	%xmm1, %edx
> +	pmovmskb	%xmm2, %r8d
> +	pmovmskb	%xmm3, %ecx
>  	salq	$16, %rdx
>  	salq	$16, %rcx
>  	orq	%r8, %rcx
> @@ -127,7 +127,7 @@ L(next48_bytes):
>  	orq	%rcx, %rdx
>  #endif
>  
> -	/* When no zero byte is found xmm9-11 are zero so we do not have to
> +	/* When no zero byte is found xmm1-3 are zero so we do not have to
>  	   zero them.  */
>  	PROLOG(loop)
>  
> @@ -149,9 +149,9 @@ L(strnlen_ret):
>  #endif
>  	.p2align 4
>  L(loop_init):
> -	pxor	%xmm9, %xmm9
> -	pxor	%xmm10, %xmm10
> -	pxor	%xmm11, %xmm11
> +	pxor	%xmm1, %xmm1
> +	pxor	%xmm2, %xmm2
> +	pxor	%xmm3, %xmm3
>  #ifdef AS_STRNLEN
>  	.p2align 4
>  L(loop):
> @@ -160,12 +160,12 @@ L(loop):
>  	cmpq	%rax, %r10
>  	je	L(exit_end)
>  
> -	movdqa	(%rax), %xmm8
> -	pminub	16(%rax), %xmm8
> -	pminub	32(%rax), %xmm8
> -	pminub	48(%rax), %xmm8
> -	pcmpeqb	%xmm11, %xmm8
> -	pmovmskb	%xmm8, %edx
> +	movdqa	(%rax), %xmm0
> +	pminub	16(%rax), %xmm0
> +	pminub	32(%rax), %xmm0
> +	pminub	48(%rax), %xmm0
> +	pcmpeqb	%xmm3, %xmm0
> +	pmovmskb	%xmm0, %edx
>  	testl	%edx, %edx
>  	jne	L(exit)
>  	jmp	L(loop)
> @@ -174,7 +174,7 @@ L(loop):
>  L(exit_end):
>  	cmp	%rax, %r11
>  	je	L(first) /* Do not read when end is at page boundary.  */
> -	pxor	%xmm8, %xmm8
> +	pxor	%xmm0, %xmm0
>  	FIND_ZERO
>  
>  L(first):
> @@ -186,7 +186,7 @@ L(first):
>  
>  	.p2align 4
>  L(exit):
> -	pxor	%xmm8, %xmm8
> +	pxor	%xmm0, %xmm0
>  	FIND_ZERO
>  
>  	bsfq	%rdx, %rdx
> @@ -200,23 +200,23 @@ L(exit):
>  	.p2align 4
>  L(loop):
>  
> -	movdqa	64(%rax), %xmm8
> -	pminub	80(%rax), %xmm8
> -	pminub	96(%rax), %xmm8
> -	pminub	112(%rax), %xmm8
> -	pcmpeqb	%xmm11, %xmm8
> -	pmovmskb	%xmm8, %edx
> +	movdqa	64(%rax), %xmm0
> +	pminub	80(%rax), %xmm0
> +	pminub	96(%rax), %xmm0
> +	pminub	112(%rax), %xmm0
> +	pcmpeqb	%xmm3, %xmm0
> +	pmovmskb	%xmm0, %edx
>  	testl	%edx, %edx
>  	jne	L(exit64)
>  
>  	subq	$-128, %rax
>  
> -	movdqa	(%rax), %xmm8
> -	pminub	16(%rax), %xmm8
> -	pminub	32(%rax), %xmm8
> -	pminub	48(%rax), %xmm8
> -	pcmpeqb	%xmm11, %xmm8
> -	pmovmskb	%xmm8, %edx
> +	movdqa	(%rax), %xmm0
> +	pminub	16(%rax), %xmm0
> +	pminub	32(%rax), %xmm0
> +	pminub	48(%rax), %xmm0
> +	pcmpeqb	%xmm3, %xmm0
> +	pmovmskb	%xmm0, %edx
>  	testl	%edx, %edx
>  	jne	L(exit0)
>  	jmp	L(loop)
> @@ -225,7 +225,7 @@ L(loop):
>  L(exit64):
>  	addq	$64, %rax
>  L(exit0):
> -	pxor	%xmm8, %xmm8
> +	pxor	%xmm0, %xmm0
>  	FIND_ZERO
>  
>  	bsfq	%rdx, %rdx
> -- 
> 2.4.3