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| author | H.J. Lu <hjl.tools@gmail.com> | 2016-04-01 15:08:48 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-04-02 09:56:55 -0700 |
| commit | cfb059c79729b26284863334c9aa04f0a3b967b9 (patch) | |
| tree | 3dabba752bc1894a65424d7ab9fdd873339c5800 | |
| parent | 30c389be1af67c4d0716d207b6780c6169d1355f (diff) | |
| download | glibc-cfb059c79729b26284863334c9aa04f0a3b967b9.tar.gz glibc-cfb059c79729b26284863334c9aa04f0a3b967b9.tar.xz glibc-cfb059c79729b26284863334c9aa04f0a3b967b9.zip | |
Remove Fast_Copy_Backward from Intel Core processors
Intel Core i3, i5 and i7 processors have fast unaligned copy and copy backward is ignored. Remove Fast_Copy_Backward from Intel Core processors to avoid confusion. * sysdeps/x86/cpu-features.c (init_cpu_features): Don't set bit_arch_Fast_Copy_Backward for Intel Core proessors. (cherry picked from commit 27d3ce1467990f89126e228559dec8f84b96c60e)
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index de75c79cf9..963b845916 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -176,11 +176,8 @@ init_cpu_features (struct cpu_features *cpu_features) case 0x2c: case 0x2e: case 0x2f: - /* Rep string instructions, copy backward, unaligned loads + /* Rep string instructions, unaligned load, unaligned copy, and pminub are fast on Intel Core i3, i5 and i7. */ -#if index_arch_Fast_Rep_String != index_arch_Fast_Copy_Backward -# error index_arch_Fast_Rep_String != index_arch_Fast_Copy_Backward -#endif #if index_arch_Fast_Rep_String != index_arch_Fast_Unaligned_Load # error index_arch_Fast_Rep_String != index_arch_Fast_Unaligned_Load #endif @@ -192,7 +189,6 @@ init_cpu_features (struct cpu_features *cpu_features) #endif cpu_features->feature[index_arch_Fast_Rep_String] |= (bit_arch_Fast_Rep_String - | bit_arch_Fast_Copy_Backward | bit_arch_Fast_Unaligned_Load | bit_arch_Fast_Unaligned_Copy | bit_arch_Prefer_PMINUB_for_stringop); |