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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.
This commit is contained in:
Amit Pawar 2016-01-14 20:06:02 +05:30 committed by H.J. Lu
parent a4b5177ca8
commit d7890e6947
2 changed files with 14 additions and 0 deletions
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6
ChangeLog
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@ -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.

8
sysdeps/x86/cpu-features.c
View File

@ -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;