Author: mjg
Date: Sun Oct 21 10:46:00 2018
New Revision: 339531
URL: https://svnweb.freebsd.org/changeset/base/339531
Log:
amd64: tidy up memset to have rax set earlier for small sizes
Modified:
head/sys/amd64/amd64/support.S
Modified: head/sys/amd64/amd64/support.S
==============================================================================
--- head/sys/amd64/amd64/support.S Sun Oct 21 09:36:12 2018
(r339530)
+++ head/sys/amd64/amd64/support.S Sun Oct 21 10:46:00 2018
(r339531)
@@ -452,11 +452,11 @@ END(memcpy_erms)
*/
.macro MEMSET erms
PUSH_FRAME_POINTER
- movq %rdi,%r9
+ movq %rdi,%rax
movq %rdx,%rcx
movzbq %sil,%r8
- movabs $0x0101010101010101,%rax
- imulq %r8,%rax
+ movabs $0x0101010101010101,%r10
+ imulq %r8,%r10
cmpq $32,%rcx
jb 1016f
@@ -465,10 +465,10 @@ END(memcpy_erms)
ja 1256f
1032:
- movq %rax,(%rdi)
- movq %rax,8(%rdi)
- movq %rax,16(%rdi)
- movq %rax,24(%rdi)
+ movq %r10,(%rdi)
+ movq %r10,8(%rdi)
+ movq %r10,16(%rdi)
+ movq %r10,24(%rdi)
leaq 32(%rdi),%rdi
subq $32,%rcx
cmpq $32,%rcx
@@ -478,54 +478,56 @@ END(memcpy_erms)
1016:
cmpb $16,%cl
jl 1008f
- movq %rax,(%rdi)
- movq %rax,8(%rdi)
+ movq %r10,(%rdi)
+ movq %r10,8(%rdi)
subb $16,%cl
jz 1000f
leaq 16(%rdi),%rdi
1008:
cmpb $8,%cl
jl 1004f
- movq %rax,(%rdi)
+ movq %r10,(%rdi)
subb $8,%cl
jz 1000f
leaq 8(%rdi),%rdi
1004:
cmpb $4,%cl
jl 1002f
- movl %eax,(%rdi)
+ movl %r10d,(%rdi)
subb $4,%cl
jz 1000f
leaq 4(%rdi),%rdi
1002:
cmpb $2,%cl
jl 1001f
- movw %ax,(%rdi)
+ movw %r10w,(%rdi)
subb $2,%cl
jz 1000f
leaq 2(%rdi),%rdi
1001:
cmpb $1,%cl
jl 1000f
- movb %al,(%rdi)
+ movb %r10b,(%rdi)
1000:
- movq %r9,%rax
POP_FRAME_POINTER
ret
ALIGN_TEXT
1256:
+ movq %rdi,%r9
+ movq %r10,%rax
.if \erms == 1
rep
stosb
+ movq %r9,%rax
.else
shrq $3,%rcx
rep
stosq
+ movq %r9,%rax
movq %rdx,%rcx
andb $7,%cl
jne 1004b
.endif
- movq %r9,%rax
POP_FRAME_POINTER
ret
.endm
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