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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/memset.S | |
| parent | 73fb56a4d51fd4437e4cde6dd3c8077a610f88a8 (diff) | |
| download | glibc-13efa86ece61bf84daca50cab30db1b0902fe2db.tar.gz glibc-13efa86ece61bf84daca50cab30db1b0902fe2db.tar.xz 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/memset.S')
| -rw-r--r-- | sysdeps/x86_64/multiarch/memset.S | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/memset.S b/sysdeps/x86_64/multiarch/memset.S index 4e52d8f8c4..2b964a0398 100644 --- a/sysdeps/x86_64/multiarch/memset.S +++ b/sysdeps/x86_64/multiarch/memset.S @@ -26,6 +26,9 @@ ENTRY(memset) .type memset, @gnu_indirect_function LOAD_RTLD_GLOBAL_RO_RDX + lea __memset_erms(%rip), %RAX_LP + HAS_ARCH_FEATURE (Prefer_ERMS) + jnz 2f lea __memset_sse2_unaligned_erms(%rip), %RAX_LP HAS_CPU_FEATURE (ERMS) jnz 1f |