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Implement memset family IFUNC selectors in C.
All internal calls within libc.so can use IFUNC on x86-64 since unlike
x86, x86-64 supports PC-relative addressing to access the GOT entry so
that it can call via PLT without using an extra register. For libc.a,
we can't use IFUNC for functions which are called before IFUNC has been
initialized. Use IFUNC internally reduces the icache footprint since
libc.so and other codes in the process use the same implementations.
This patch uses IFUNC for memset functions within libc.
2017-06-07 H.J. Lu <hongjiu.lu@intel.com>
Erich Elsen <eriche@google.com>
* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
memset-sse2-unaligned-erms, and memset_chk-nonshared.
* sysdeps/x86_64/multiarch/ifunc-impl-list.c
(__libc_ifunc_impl_list): Add test for __memset_chk_erms.
Update comments.
* sysdeps/x86_64/multiarch/ifunc-memset.h: New file.
* sysdeps/x86_64/multiarch/memset-sse2-unaligned-erms.S: Likewise.
* sysdeps/x86_64/multiarch/memset.c: Likewise.
* sysdeps/x86_64/multiarch/memset_chk-nonshared.S: Likewise.
* sysdeps/x86_64/multiarch/memset_chk.c: Likewise.
* sysdeps/x86_64/multiarch/memset.S: Removed.
* sysdeps/x86_64/multiarch/memset_chk.S: Likewise.
* sysdeps/x86_64/multiarch/memset-vec-unaligned-erms.S
(__memset_chk_erms): New function.
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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.
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