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[PATCH 4/7] Replace %xmm8 with %xmm0
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: GNU C Library <libc-alpha at sourceware dot org>
- Date: Tue, 25 Aug 2015 05:23:20 -0700
- Subject: [PATCH 4/7] Replace %xmm8 with %xmm0
- Authentication-results: sourceware.org; auth=none
Since ld.so preserves vector registers now, we can use %xmm0 to avoid
the REX prefix.
OK for master?
H.J.
---
* sysdeps/x86_64/memset.S: Replace %xmm8 with %xmm0.
---
sysdeps/x86_64/memset.S | 52 ++++++++++++++++++++++++-------------------------
1 file changed, 26 insertions(+), 26 deletions(-)
diff --git a/sysdeps/x86_64/memset.S b/sysdeps/x86_64/memset.S
index e496254..3855cc8 100644
--- a/sysdeps/x86_64/memset.S
+++ b/sysdeps/x86_64/memset.S
@@ -24,7 +24,7 @@
ENTRY(__bzero)
movq %rdi, %rax /* Set return value. */
movq %rsi, %rdx /* Set n. */
- pxor %xmm8, %xmm8
+ pxor %xmm0, %xmm0
jmp L(entry_from_bzero)
END(__bzero)
weak_alias (__bzero, bzero)
@@ -33,10 +33,10 @@ weak_alias (__bzero, bzero)
ENTRY(__memset_tail)
movq %rcx, %rax /* Set return value. */
- movd %esi, %xmm8
- punpcklbw %xmm8, %xmm8
- punpcklwd %xmm8, %xmm8
- pshufd $0, %xmm8, %xmm8
+ movd %esi, %xmm0
+ punpcklbw %xmm0, %xmm0
+ punpcklwd %xmm0, %xmm0
+ pshufd $0, %xmm0, %xmm0
jmp L(entry_from_bzero)
END(__memset_tail)
@@ -50,57 +50,57 @@ END_CHK (__memset_chk)
#endif
ENTRY (memset)
- movd %esi, %xmm8
+ movd %esi, %xmm0
movq %rdi, %rax
- punpcklbw %xmm8, %xmm8
- punpcklwd %xmm8, %xmm8
- pshufd $0, %xmm8, %xmm8
+ punpcklbw %xmm0, %xmm0
+ punpcklwd %xmm0, %xmm0
+ pshufd $0, %xmm0, %xmm0
L(entry_from_bzero):
cmpq $64, %rdx
ja L(loop_start)
cmpq $16, %rdx
jbe L(less_16_bytes)
cmpq $32, %rdx
- movdqu %xmm8, (%rdi)
- movdqu %xmm8, -16(%rdi,%rdx)
+ movdqu %xmm0, (%rdi)
+ movdqu %xmm0, -16(%rdi,%rdx)
ja L(between_32_64_bytes)
L(return):
rep
ret
.p2align 4
L(between_32_64_bytes):
- movdqu %xmm8, 16(%rdi)
- movdqu %xmm8, -32(%rdi,%rdx)
+ movdqu %xmm0, 16(%rdi)
+ movdqu %xmm0, -32(%rdi,%rdx)
ret
.p2align 4
L(loop_start):
leaq 64(%rdi), %rcx
- movdqu %xmm8, (%rdi)
+ movdqu %xmm0, (%rdi)
andq $-64, %rcx
- movdqu %xmm8, -16(%rdi,%rdx)
- movdqu %xmm8, 16(%rdi)
- movdqu %xmm8, -32(%rdi,%rdx)
- movdqu %xmm8, 32(%rdi)
- movdqu %xmm8, -48(%rdi,%rdx)
- movdqu %xmm8, 48(%rdi)
- movdqu %xmm8, -64(%rdi,%rdx)
+ movdqu %xmm0, -16(%rdi,%rdx)
+ movdqu %xmm0, 16(%rdi)
+ movdqu %xmm0, -32(%rdi,%rdx)
+ movdqu %xmm0, 32(%rdi)
+ movdqu %xmm0, -48(%rdi,%rdx)
+ movdqu %xmm0, 48(%rdi)
+ movdqu %xmm0, -64(%rdi,%rdx)
addq %rdi, %rdx
andq $-64, %rdx
cmpq %rdx, %rcx
je L(return)
.p2align 4
L(loop):
- movdqa %xmm8, (%rcx)
- movdqa %xmm8, 16(%rcx)
- movdqa %xmm8, 32(%rcx)
- movdqa %xmm8, 48(%rcx)
+ movdqa %xmm0, (%rcx)
+ movdqa %xmm0, 16(%rcx)
+ movdqa %xmm0, 32(%rcx)
+ movdqa %xmm0, 48(%rcx)
addq $64, %rcx
cmpq %rcx, %rdx
jne L(loop)
rep
ret
L(less_16_bytes):
- movq %xmm8, %rcx
+ movq %xmm0, %rcx
testb $24, %dl
jne L(between8_16bytes)
testb $4, %dl
--
2.4.3