amd64: make memmove and memcpy less slow with mov
The reasoning is the same as with the memset change, see r339205 Reviewed by: kib (previous version) Approved by: re (gjb) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17441
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@ -200,40 +200,202 @@ END(memcmp)
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* Adapted from bcopy written by:
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* ws@tools.de (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
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*/
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ENTRY(memmove_std)
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PUSH_FRAME_POINTER
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movq %rdi,%rax
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movq %rdx,%rcx
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/*
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* Register state at entry is supposed to be as follows:
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* rdi - destination
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* rsi - source
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* rdx - count
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*
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* The macro possibly clobbers the above and: rcx, r8.
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* It does not clobber rax, r10 nor r11.
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*/
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.macro MEMMOVE erms overlap begin end
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\begin
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.if \overlap == 1
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movq %rdi,%r8
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subq %rsi,%r8
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cmpq %rcx,%r8 /* overlapping && src < dst? */
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jb 2f
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.endif
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cmpq $15,%rcx
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jbe 1f
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cmpq $32,%rcx
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jb 1016f
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cmpq $256,%rcx
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ja 1256f
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1032:
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movq (%rsi),%rdx
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movq %rdx,(%rdi)
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movq 8(%rsi),%rdx
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movq %rdx,8(%rdi)
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movq 16(%rsi),%rdx
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movq %rdx,16(%rdi)
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movq 24(%rsi),%rdx
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movq %rdx,24(%rdi)
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leaq 32(%rsi),%rsi
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leaq 32(%rdi),%rdi
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subq $32,%rcx
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cmpq $32,%rcx
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jae 1032b
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cmpb $0,%cl
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jne 1016f
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\end
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ret
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ALIGN_TEXT
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1016:
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cmpb $16,%cl
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jl 1008f
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movq (%rsi),%rdx
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movq %rdx,(%rdi)
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movq 8(%rsi),%rdx
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movq %rdx,8(%rdi)
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subb $16,%cl
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jz 1000f
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leaq 16(%rsi),%rsi
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leaq 16(%rdi),%rdi
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1008:
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cmpb $8,%cl
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jl 1004f
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movq (%rsi),%rdx
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movq %rdx,(%rdi)
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subb $8,%cl
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jz 1000f
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leaq 8(%rsi),%rsi
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leaq 8(%rdi),%rdi
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1004:
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cmpb $4,%cl
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jl 1002f
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movl (%rsi),%edx
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movl %edx,(%rdi)
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subb $4,%cl
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jz 1000f
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leaq 4(%rsi),%rsi
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leaq 4(%rdi),%rdi
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1002:
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cmpb $2,%cl
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jl 1001f
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movw (%rsi),%dx
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movw %dx,(%rdi)
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subb $2,%cl
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jz 1000f
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leaq 2(%rsi),%rsi
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leaq 2(%rdi),%rdi
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1001:
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cmpb $1,%cl
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jl 1000f
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movb (%rsi),%dl
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movb %dl,(%rdi)
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1000:
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\end
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ret
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ALIGN_TEXT
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1256:
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.if \erms == 1
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rep
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movsb
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.else
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shrq $3,%rcx /* copy by 64-bit words */
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rep
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movsq
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movq %rdx,%rcx
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andq $7,%rcx /* any bytes left? */
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jne 1f
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POP_FRAME_POINTER
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ret
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ALIGN_TEXT
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1:
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rep
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movsb
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POP_FRAME_POINTER
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andb $7,%cl /* any bytes left? */
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jne 1004b
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.endif
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\end
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ret
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/* ALIGN_TEXT */
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.if \overlap == 1
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/*
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* Copy backwards.
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*/
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ALIGN_TEXT
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2:
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addq %rcx,%rdi /* copy backwards */
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addq %rcx,%rdi
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addq %rcx,%rsi
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cmpq $32,%rcx
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jb 2016f
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cmpq $256,%rcx
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ja 2256f
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2032:
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movq -8(%rsi),%rdx
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movq %rdx,-8(%rdi)
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movq -16(%rsi),%rdx
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movq %rdx,-16(%rdi)
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movq -24(%rsi),%rdx
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movq %rdx,-24(%rdi)
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movq -32(%rsi),%rdx
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movq %rdx,-32(%rdi)
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leaq -32(%rsi),%rsi
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leaq -32(%rdi),%rdi
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subq $32,%rcx
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cmpq $32,%rcx
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jae 2032b
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cmpb $0,%cl
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jne 2016f
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\end
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ret
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ALIGN_TEXT
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2016:
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cmpb $16,%cl
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jl 2008f
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movq -8(%rsi),%rdx
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movq %rdx,-8(%rdi)
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movq -16(%rsi),%rdx
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movq %rdx,-16(%rdi)
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subb $16,%cl
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jz 2000f
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leaq -16(%rsi),%rsi
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leaq -16(%rdi),%rdi
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2008:
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cmpb $8,%cl
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jl 2004f
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movq -8(%rsi),%rdx
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movq %rdx,-8(%rdi)
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subb $8,%cl
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jz 2000f
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leaq -8(%rsi),%rsi
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leaq -8(%rdi),%rdi
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2004:
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cmpb $4,%cl
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jl 2002f
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movl -4(%rsi),%edx
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movl %edx,-4(%rdi)
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subb $4,%cl
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jz 2000f
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leaq -4(%rsi),%rsi
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leaq -4(%rdi),%rdi
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2002:
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cmpb $2,%cl
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jl 2001f
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movw -2(%rsi),%dx
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movw %dx,-2(%rdi)
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subb $2,%cl
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jz 2000f
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leaq -2(%rsi),%rsi
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leaq -2(%rdi),%rdi
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2001:
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cmpb $1,%cl
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jl 2000f
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movb -1(%rsi),%dl
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movb %dl,-1(%rdi)
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2000:
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\end
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ret
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ALIGN_TEXT
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2256:
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decq %rdi
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decq %rsi
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std
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.if \erms == 1
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rep
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movsb
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.else
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andq $7,%rcx /* any fractional bytes? */
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je 3f
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rep
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@ -245,37 +407,29 @@ ENTRY(memmove_std)
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subq $7,%rdi
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rep
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movsq
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.endif
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cld
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POP_FRAME_POINTER
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\end
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ret
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END(memmove_std)
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.endif
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.endm
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ENTRY(memmove_erms)
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.macro MEMMOVE_BEGIN
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PUSH_FRAME_POINTER
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movq %rdi,%rax
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movq %rdx,%rcx
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.endm
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movq %rdi,%r8
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subq %rsi,%r8
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cmpq %rcx,%r8 /* overlapping && src < dst? */
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jb 1f
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rep
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movsb
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.macro MEMMOVE_END
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POP_FRAME_POINTER
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ret
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.endm
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1:
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addq %rcx,%rdi /* copy backwards */
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addq %rcx,%rsi
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decq %rdi
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decq %rsi
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std
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rep
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movsb
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cld
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POP_FRAME_POINTER
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ret
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ENTRY(memmove_std)
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MEMMOVE erms=0 overlap=1 begin=MEMMOVE_BEGIN end=MEMMOVE_END
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END(memmove_std)
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ENTRY(memmove_erms)
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MEMMOVE erms=1 overlap=1 begin=MEMMOVE_BEGIN end=MEMMOVE_END
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END(memmove_erms)
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/*
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@ -285,35 +439,11 @@ END(memmove_erms)
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* Note: memcpy does not support overlapping copies
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*/
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ENTRY(memcpy_std)
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PUSH_FRAME_POINTER
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movq %rdi,%rax
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movq %rdx,%rcx
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cmpq $15,%rcx
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jbe 1f
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shrq $3,%rcx /* copy by 64-bit words */
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rep
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movsq
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movq %rdx,%rcx
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andq $7,%rcx /* any bytes left? */
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jne 1f
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POP_FRAME_POINTER
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ret
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ALIGN_TEXT
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1:
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rep
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movsb
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POP_FRAME_POINTER
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ret
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MEMMOVE erms=0 overlap=0 begin=MEMMOVE_BEGIN end=MEMMOVE_END
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END(memcpy_std)
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ENTRY(memcpy_erms)
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PUSH_FRAME_POINTER
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movq %rdi,%rax
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movq %rdx,%rcx
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rep
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movsb
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POP_FRAME_POINTER
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ret
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MEMMOVE erms=1 overlap=0 begin=MEMMOVE_BEGIN end=MEMMOVE_END
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END(memcpy_erms)
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/*
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