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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-06-05 11:09:48 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-06-05 11:09:59 -0700 |
| commit | ef9c4cb6c7abb6340b52e19de31d2a56c8de5844 (patch) | |
| tree | e97752428e31d5d595c22a44b1905b5a91948d24 /sysdeps/x86_64/memset.S | |
| parent | 9cd30491dd6d9d4c5e9372d7a5c75f78f3a11260 (diff) | |
| download | glibc-ef9c4cb6c7abb6340b52e19de31d2a56c8de5844.tar.gz | |
x86-64: Optimize wmemset with SSE2/AVX2/AVX512
The difference between memset and wmemset is byte vs int. Add stubs
to SSE2/AVX2/AVX512 memset for wmemset with updated constant and size:
SSE2 wmemset:
shl $0x2,%rdx
movd %esi,%xmm0
mov %rdi,%rax
pshufd $0x0,%xmm0,%xmm0
jmp entry_from_wmemset
SSE2 memset:
movd %esi,%xmm0
mov %rdi,%rax
punpcklbw %xmm0,%xmm0
punpcklwd %xmm0,%xmm0
pshufd $0x0,%xmm0,%xmm0
entry_from_wmemset:
Since the ERMS versions of wmemset requires "rep stosl" instead of
"rep stosb", only the vector store stubs of SSE2/AVX2/AVX512 wmemset
are added. The SSE2 wmemset is about 3X faster and the AVX2 wmemset
is about 6X faster on Haswell.
* include/wchar.h (__wmemset_chk): New.
* sysdeps/x86_64/memset.S (VDUP_TO_VEC0_AND_SET_RETURN): Renamed
to MEMSET_VDUP_TO_VEC0_AND_SET_RETURN.
(WMEMSET_VDUP_TO_VEC0_AND_SET_RETURN): New.
(WMEMSET_CHK_SYMBOL): Likewise.
(WMEMSET_SYMBOL): Likewise.
(__wmemset): Add hidden definition.
(wmemset): Add weak hidden definition.
* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
wmemset_chk-nonshared.
* sysdeps/x86_64/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Add __wmemset_sse2_unaligned,
__wmemset_avx2_unaligned, __wmemset_avx512_unaligned,
__wmemset_chk_sse2_unaligned, __wmemset_chk_avx2_unaligned
and __wmemset_chk_avx512_unaligned.
* sysdeps/x86_64/multiarch/memset-avx2-unaligned-erms.S
(VDUP_TO_VEC0_AND_SET_RETURN): Renamed to ...
(MEMSET_VDUP_TO_VEC0_AND_SET_RETURN): This.
(WMEMSET_VDUP_TO_VEC0_AND_SET_RETURN): New.
(WMEMSET_SYMBOL): Likewise.
* sysdeps/x86_64/multiarch/memset-avx512-unaligned-erms.S
(VDUP_TO_VEC0_AND_SET_RETURN): Renamed to ...
(MEMSET_VDUP_TO_VEC0_AND_SET_RETURN): This.
(WMEMSET_VDUP_TO_VEC0_AND_SET_RETURN): New.
(WMEMSET_SYMBOL): Likewise.
* sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S: Updated.
(WMEMSET_CHK_SYMBOL): New.
(WMEMSET_CHK_SYMBOL (__wmemset_chk, unaligned)): Likewise.
(WMEMSET_SYMBOL (__wmemset, unaligned)): Likewise.
* sysdeps/x86_64/multiarch/memset.S (WMEMSET_SYMBOL): New.
(libc_hidden_builtin_def): Also define __GI_wmemset and
__GI___wmemset.
(weak_alias): New.
* sysdeps/x86_64/multiarch/wmemset.c: New file.
* sysdeps/x86_64/multiarch/wmemset.h: Likewise.
* sysdeps/x86_64/multiarch/wmemset_chk-nonshared.S: Likewise.
* sysdeps/x86_64/multiarch/wmemset_chk.c: Likewise.
* sysdeps/x86_64/wmemset.c: Likewise.
* sysdeps/x86_64/wmemset_chk.c: Likewise.
Diffstat (limited to 'sysdeps/x86_64/memset.S')
| -rw-r--r-- | sysdeps/x86_64/memset.S | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/sysdeps/x86_64/memset.S b/sysdeps/x86_64/memset.S index 69ed509c28..41278787fe 100644 --- a/sysdeps/x86_64/memset.S +++ b/sysdeps/x86_64/memset.S @@ -26,13 +26,18 @@ #define VMOVU movdqu #define VMOVA movdqa -#define VDUP_TO_VEC0_AND_SET_RETURN(d, r) \ +#define MEMSET_VDUP_TO_VEC0_AND_SET_RETURN(d, r) \ movd d, %xmm0; \ movq r, %rax; \ punpcklbw %xmm0, %xmm0; \ punpcklwd %xmm0, %xmm0; \ pshufd $0, %xmm0, %xmm0 +#define WMEMSET_VDUP_TO_VEC0_AND_SET_RETURN(d, r) \ + movd d, %xmm0; \ + movq r, %rax; \ + pshufd $0, %xmm0, %xmm0 + #define SECTION(p) p #ifndef MEMSET_SYMBOL @@ -40,10 +45,21 @@ # define MEMSET_SYMBOL(p,s) memset #endif +#ifndef WMEMSET_SYMBOL +# define WMEMSET_CHK_SYMBOL(p,s) p +# define WMEMSET_SYMBOL(p,s) __wmemset +#endif + #include "multiarch/memset-vec-unaligned-erms.S" libc_hidden_builtin_def (memset) +#if IS_IN (libc) +libc_hidden_def (__wmemset) +weak_alias (__wmemset, wmemset) +libc_hidden_weak (wmemset) +#endif + #if defined SHARED && IS_IN (libc) && !defined USE_MULTIARCH strong_alias (__memset_chk, __memset_zero_constant_len_parameter) .section .gnu.warning.__memset_zero_constant_len_parameter |