AcoSail/kernel_optimize_test
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x86-64: remove unnecessary spill/reload of rbx from memcpy

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Impact: micro-optimization

This should slightly improve its performance.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
LKML-Reference: <49B8F641.76E4.0078.0@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jan Beulich 2009-03-12 10:47:13 +00:00 committed by Ingo Molnar
parent c2810188c1
commit dd1ef4ec47
1 changed files with 0 additions and 7 deletions
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7
arch/x86/lib/memcpy_64.S
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@ -33,9 +33,6 @@ ENDPROC(memcpy_c)
ENTRY(__memcpy) ENTRY(__memcpy)
ENTRY(memcpy) ENTRY(memcpy)
CFI_STARTPROC CFI_STARTPROC
pushq %rbx
CFI_ADJUST_CFA_OFFSET 8
CFI_REL_OFFSET rbx, 0
movq %rdi,%rax movq %rdi,%rax
movl %edx,%ecx movl %edx,%ecx
@ -102,11 +99,7 @@ ENTRY(memcpy)
jnz .Lloop_1 jnz .Lloop_1
.Lende: .Lende:
popq %rbx
CFI_ADJUST_CFA_OFFSET -8
CFI_RESTORE rbx
ret ret
.Lfinal:
CFI_ENDPROC CFI_ENDPROC
ENDPROC(memcpy) ENDPROC(memcpy)
ENDPROC(__memcpy) ENDPROC(__memcpy)