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GNU C Library master sources branch master updated. glibc-2.27.9000-408-ge28e9b1
- From: hjl at sourceware dot org
- To: glibc-cvs at sourceware dot org
- Date: 21 May 2018 23:55:44 -0000
- Subject: GNU C Library master sources branch master updated. glibc-2.27.9000-408-ge28e9b1
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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=e28e9b1ec40d5b545d980b0a36cbe41f3d1dbf6a
commit e28e9b1ec40d5b545d980b0a36cbe41f3d1dbf6a
Author: H.J. Lu <hjl.tools@gmail.com>
Date: Mon May 21 16:54:46 2018 -0700
x86-64: Check Prefer_FSRM in ifunc-memmove.h
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.
diff --git a/ChangeLog b/ChangeLog
index c8ff9d4..ee8f745 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,14 @@
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.
(index_cpu_FSRM): Likewise.
(reg_FSRM): Likewise.
diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h
index 2088bd7..624e681 100644
--- a/sysdeps/x86/cpu-features.h
+++ b/sysdeps/x86/cpu-features.h
@@ -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__ */
diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c
index a21a615..af761dc 100644
--- a/sysdeps/x86/cpu-tunables.c
+++ b/sysdeps/x86/cpu-tunables.c
@@ -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)
diff --git a/sysdeps/x86_64/multiarch/ifunc-memmove.h b/sysdeps/x86_64/multiarch/ifunc-memmove.h
index a2ffba0..5b1eb1c 100644
--- a/sysdeps/x86_64/multiarch/ifunc-memmove.h
+++ b/sysdeps/x86_64/multiarch/ifunc-memmove.h
@@ -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)
-----------------------------------------------------------------------
Summary of changes:
ChangeLog | 9 +++++++++
sysdeps/x86/cpu-features.h | 2 ++
sysdeps/x86/cpu-tunables.c | 2 ++
sysdeps/x86_64/multiarch/ifunc-memmove.h | 3 ++-
4 files changed, 15 insertions(+), 1 deletions(-)
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