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x86-64: Check Prefer_FSRM in ifunc-memmove.h

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Although the REP MOVSB implementations of memmove, memcpy and mempcpy
aren't used by the current processors, this patch adds Prefer_FSRM
check in ifunc-memmove.h so that they can be used in the future.

	* sysdeps/x86/cpu-features.h (bit_arch_Prefer_FSRM): New.
	(index_arch_Prefer_FSRM): Likewise.
	* sysdeps/x86/cpu-tunables.c (TUNABLE_CALLBACK (set_hwcaps)):
	Also check Prefer_FSRM.
	* sysdeps/x86_64/multiarch/ifunc-memmove.h (IFUNC_SELECTOR):
	Also return OPTIMIZE (erms) for Prefer_FSRM.
This commit is contained in:
H.J. Lu 2018-05-21 16:54:46 -07:00
parent 1af30adcd5
commit e28e9b1ec4
4 changed files with 15 additions and 1 deletions
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9
ChangeLog
View File

@ -1,3 +1,12 @@
2018-05-21 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86/cpu-features.h (bit_arch_Prefer_FSRM): New.
(index_arch_Prefer_FSRM): Likewise.
* sysdeps/x86/cpu-tunables.c (TUNABLE_CALLBACK (set_hwcaps)):
Also check Prefer_FSRM.
* sysdeps/x86_64/multiarch/ifunc-memmove.h (IFUNC_SELECTOR):
Also return OPTIMIZE (erms) for Prefer_FSRM.
2018-05-21 H.J. Lu <hongjiu.lu@intel.com>
* sysdeps/x86/cpu-features.h (bit_cpu_FSRM): New.

2
sysdeps/x86/cpu-features.h
View File

@ -40,6 +40,7 @@
#define bit_arch_Prefer_No_AVX512 (1 << 20)
#define bit_arch_MathVec_Prefer_No_AVX512 (1 << 21)
#define bit_arch_XSAVEC_Usable (1 << 22)
#define bit_arch_Prefer_FSRM (1 << 23)
/* CPUID Feature flags. */
@ -264,6 +265,7 @@ extern const struct cpu_features *__get_cpu_features (void)
# define index_arch_Prefer_No_AVX512 FEATURE_INDEX_1
# define index_arch_MathVec_Prefer_No_AVX512 FEATURE_INDEX_1
# define index_arch_XSAVEC_Usable FEATURE_INDEX_1
# define index_arch_Prefer_FSRM FEATURE_INDEX_1
#endif /* !__ASSEMBLER__ */

2
sysdeps/x86/cpu-tunables.c
View File

@ -241,6 +241,8 @@ TUNABLE_CALLBACK (set_hwcaps) (tunable_val_t *valp)
CHECK_GLIBC_IFUNC_ARCH_NEED_CPU_BOTH (n, cpu_features,
Slow_SSE4_2, SSE4_2,
disable, 11);
CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, Prefer_FSRM,
disable, 11);
break;
case 13:
if (disable)

3
sysdeps/x86_64/multiarch/ifunc-memmove.h
View File

@ -41,7 +41,8 @@ IFUNC_SELECTOR (void)
{
const struct cpu_features* cpu_features = __get_cpu_features ();
if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_ERMS))
if (CPU_FEATURES_ARCH_P (cpu_features, Prefer_ERMS)
|| CPU_FEATURES_ARCH_P (cpu_features, Prefer_FSRM))
return OPTIMIZE (erms);
if (CPU_FEATURES_ARCH_P (cpu_features, AVX512F_Usable)