From 13efa86ece61bf84daca50cab30db1b0902fe2db Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Thu, 30 Jun 2016 07:57:07 -0700 Subject: 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. --- sysdeps/x86/cpu-features.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'sysdeps/x86') diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index 2bd9371..97ffe76 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -36,6 +36,7 @@ #define bit_arch_Prefer_MAP_32BIT_EXEC (1 << 16) #define bit_arch_Prefer_No_VZEROUPPER (1 << 17) #define bit_arch_Fast_Unaligned_Copy (1 << 18) +#define bit_arch_Prefer_ERMS (1 << 19) /* CPUID Feature flags. */ @@ -105,6 +106,7 @@ # define index_arch_Prefer_MAP_32BIT_EXEC FEATURE_INDEX_1*FEATURE_SIZE # define index_arch_Prefer_No_VZEROUPPER FEATURE_INDEX_1*FEATURE_SIZE # define index_arch_Fast_Unaligned_Copy FEATURE_INDEX_1*FEATURE_SIZE +# define index_arch_Prefer_ERMS FEATURE_INDEX_1*FEATURE_SIZE # if defined (_LIBC) && !IS_IN (nonlib) @@ -274,6 +276,7 @@ extern const struct cpu_features *__get_cpu_features (void) # define index_arch_Prefer_MAP_32BIT_EXEC FEATURE_INDEX_1 # define index_arch_Prefer_No_VZEROUPPER FEATURE_INDEX_1 # define index_arch_Fast_Unaligned_Copy FEATURE_INDEX_1 +# define index_arch_Prefer_ERMS FEATURE_INDEX_1 #endif /* !__ASSEMBLER__ */ -- cgit v1.1