diff mbox

Remove Fast_Copy_Backward from Intel Core processors

Message ID 20160401205128.GA25653@intel.com
State New, archived
Headers show

Commit Message

H.J. Lu April 1, 2016, 8:51 p.m. UTC
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.

I will check it in shortly.

H.J.
---
	* sysdeps/x86/cpu-features.c (init_cpu_features): Don't set
	bit_arch_Fast_Copy_Backward.
---
 sysdeps/x86/cpu-features.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
diff mbox

Patch

diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c
index de75c79..963b845 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);