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| author | Amit Pawar <Amit.Pawar@amd.com> | 2016-01-14 20:06:02 +0530 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-01-14 08:14:31 -0800 |
| commit | d7890e6947114785755ae5b1cf5310491092ee0b (patch) | |
| tree | d69fa16cd7eec8008f4224a8006128555916262c | |
| parent | a4b5177ca83ca97c562a7138923dafe0cb92d1a0 (diff) | |
| download | glibc-d7890e6947114785755ae5b1cf5310491092ee0b.zip glibc-d7890e6947114785755ae5b1cf5310491092ee0b.tar.gz glibc-d7890e6947114785755ae5b1cf5310491092ee0b.tar.bz2 | |
Set index_Fast_Unaligned_Load for Excavator family CPUs
GLIBC benchtest testcases shows SSE2_Unaligned based implementations
are performing faster compare to SSE2 based implementations for
routines: strcmp, strcat, strncat, stpcpy, stpncpy, strcpy, strncpy
and strstr. Flag index_Fast_Unaligned_Load is set for Excavator family
0x15h CPU's. This makes SSE2_Unaligned based implementations as
default for these routines.
[BZ #19467]
* sysdeps/x86/cpu-features.c (init_cpu_features): Set
index_Fast_Unaligned_Load flag for Excavator family CPUs.
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 8 |
2 files changed, 14 insertions, 0 deletions
@@ -1,3 +1,9 @@ +2016-01-14 Amit Pawar <amit.pawar@amd.com> + + [BZ #19467] + * sysdeps/x86/cpu-features.c (init_cpu_features): Set + index_Fast_Unaligned_Load flag for Excavator family CPUs. + 2016-01-02 Marcin Kościelnicki <koriakin@0x04.net> * sysdeps/s390/nptl/tls.h (struct tcbhead_t): Add __private_ss field. diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index e6bd4c9..218ff2b 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -154,6 +154,14 @@ init_cpu_features (struct cpu_features *cpu_features) cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ebx, cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].ecx, cpu_features->cpuid[COMMON_CPUID_INDEX_80000001].edx); + + if (family == 0x15) + { + /* "Excavator" */ + if (model >= 0x60 && model <= 0x7f) + cpu_features->feature[index_Fast_Unaligned_Load] + |= bit_Fast_Unaligned_Load; + } } else kind = arch_kind_other; |