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| author | H.J. Lu <hjl.tools@gmail.com> | 2016-06-30 07:57:07 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-06-30 07:58:11 -0700 |
| commit | 13efa86ece61bf84daca50cab30db1b0902fe2db (patch) | |
| tree | e6ed4e21bb720ba21d069d61064a057be6f999db /sysdeps/x86_64/multiarch/memcpy.S | |
| parent | 73fb56a4d51fd4437e4cde6dd3c8077a610f88a8 (diff) | |
| download | glibc-13efa86ece61bf84daca50cab30db1b0902fe2db.tar glibc-13efa86ece61bf84daca50cab30db1b0902fe2db.tar.gz glibc-13efa86ece61bf84daca50cab30db1b0902fe2db.tar.bz2 glibc-13efa86ece61bf84daca50cab30db1b0902fe2db.zip | |
Check Prefer_ERMS in memmove/memcpy/mempcpy/memset
Although the Enhanced REP MOVSB/STOSB (ERMS) implementations of memmove,
memcpy, mempcpy and memset aren't used by the current processors, this
patch adds Prefer_ERMS check in memmove, memcpy, mempcpy and memset so
that they can be used in the future.
* sysdeps/x86/cpu-features.h (bit_arch_Prefer_ERMS): New.
(index_arch_Prefer_ERMS): Likewise.
* sysdeps/x86_64/multiarch/memcpy.S (__new_memcpy): Return
__memcpy_erms for Prefer_ERMS.
* sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
(__memmove_erms): Enabled for libc.a.
* ysdeps/x86_64/multiarch/memmove.S (__libc_memmove): Return
__memmove_erms or Prefer_ERMS.
* sysdeps/x86_64/multiarch/mempcpy.S (__mempcpy): Return
__mempcpy_erms for Prefer_ERMS.
* sysdeps/x86_64/multiarch/memset.S (memset): Return
__memset_erms for Prefer_ERMS.
Diffstat (limited to 'sysdeps/x86_64/multiarch/memcpy.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memcpy.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/memcpy.S b/sysdeps/x86_64/multiarch/memcpy.S index f6771a4696..df7fbacd8a 100644 --- a/sysdeps/x86_64/multiarch/memcpy.S +++ b/sysdeps/x86_64/multiarch/memcpy.S @@ -29,6 +29,9 @@ ENTRY(__new_memcpy) .type __new_memcpy, @gnu_indirect_function LOAD_RTLD_GLOBAL_RO_RDX + lea __memcpy_erms(%rip), %RAX_LP + HAS_ARCH_FEATURE (Prefer_ERMS) + jnz 2f # ifdef HAVE_AVX512_ASM_SUPPORT HAS_ARCH_FEATURE (AVX512F_Usable) jz 1f |