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| author | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-14 19:56:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-14 19:56:02 -0800 |
| commit | 4060994c3e337b40e0f6fa8ce2cc178e021baf3d (patch) | |
| tree | 980297c1747ca89354bc879cc5d17903eacb19e2 /arch/x86_64/lib/memset.S | |
| parent | 0174f72f848dfe7dc7488799776303c81b181b16 (diff) | |
| parent | d3ee871e63d0a0c70413dc0aa5534b8d6cd6ec37 (diff) | |
Merge x86-64 update from Andi
Diffstat (limited to 'arch/x86_64/lib/memset.S')
| -rw-r--r-- | arch/x86_64/lib/memset.S | 94 |
1 files changed, 0 insertions, 94 deletions
diff --git a/arch/x86_64/lib/memset.S b/arch/x86_64/lib/memset.S index 4b4c4063864..2aa48f24ed1 100644 --- a/arch/x86_64/lib/memset.S +++ b/arch/x86_64/lib/memset.S @@ -13,98 +13,6 @@ .p2align 4 memset: __memset: - movq %rdi,%r10 - movq %rdx,%r11 - - /* expand byte value */ - movzbl %sil,%ecx - movabs $0x0101010101010101,%rax - mul %rcx /* with rax, clobbers rdx */ - - /* align dst */ - movl %edi,%r9d - andl $7,%r9d - jnz .Lbad_alignment -.Lafter_bad_alignment: - - movl %r11d,%ecx - shrl $6,%ecx - jz .Lhandle_tail - - .p2align 4 -.Lloop_64: - decl %ecx - movq %rax,(%rdi) - movq %rax,8(%rdi) - movq %rax,16(%rdi) - movq %rax,24(%rdi) - movq %rax,32(%rdi) - movq %rax,40(%rdi) - movq %rax,48(%rdi) - movq %rax,56(%rdi) - leaq 64(%rdi),%rdi - jnz .Lloop_64 - - /* Handle tail in loops. The loops should be faster than hard - to predict jump tables. */ - .p2align 4 -.Lhandle_tail: - movl %r11d,%ecx - andl $63&(~7),%ecx - jz .Lhandle_7 - shrl $3,%ecx - .p2align 4 -.Lloop_8: - decl %ecx - movq %rax,(%rdi) - leaq 8(%rdi),%rdi - jnz .Lloop_8 - -.Lhandle_7: - movl %r11d,%ecx - andl $7,%ecx - jz .Lende - .p2align 4 -.Lloop_1: - decl %ecx - movb %al,(%rdi) - leaq 1(%rdi),%rdi - jnz .Lloop_1 - -.Lende: - movq %r10,%rax - ret - -.Lbad_alignment: - cmpq $7,%r11 - jbe .Lhandle_7 - movq %rax,(%rdi) /* unaligned store */ - movq $8,%r8 - subq %r9,%r8 - addq %r8,%rdi - subq %r8,%r11 - jmp .Lafter_bad_alignment - - /* C stepping K8 run faster using the string instructions. - It is also a lot simpler. Use this when possible */ - -#include <asm/cpufeature.h> - - .section .altinstructions,"a" - .align 8 - .quad memset - .quad memset_c - .byte X86_FEATURE_K8_C - .byte memset_c_end-memset_c - .byte memset_c_end-memset_c - .previous - - .section .altinstr_replacement,"ax" - /* rdi destination - * rsi value - * rdx count - */ -memset_c: movq %rdi,%r9 movl %edx,%r8d andl $7,%r8d @@ -121,5 +29,3 @@ memset_c: stosb movq %r9,%rax ret -memset_c_end: - .previous |