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-rw-r--r--sysdeps/x86_64/multiarch/init-arch.c6
-rw-r--r--sysdeps/x86_64/multiarch/init-arch.h6
2 files changed, 12 insertions, 0 deletions
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c
index 55c9f54f96..786466d5fd 100644
--- a/sysdeps/x86_64/multiarch/init-arch.c
+++ b/sysdeps/x86_64/multiarch/init-arch.c
@@ -72,6 +72,12 @@ __init_cpu_features (void)
 	  model += extended_model;
 	  switch (model)
 	    {
+	    case 0x1c:
+	    case 0x26:
+	      /* BSF is slow on Atom.  */
+	      __cpu_features.feature[index_Slow_BSF] |= bit_Slow_BSF;
+	      break;
+
 	    case 0x1a:
 	    case 0x1e:
 	    case 0x1f:
diff --git a/sysdeps/x86_64/multiarch/init-arch.h b/sysdeps/x86_64/multiarch/init-arch.h
index 4a211c0864..783b02015e 100644
--- a/sysdeps/x86_64/multiarch/init-arch.h
+++ b/sysdeps/x86_64/multiarch/init-arch.h
@@ -18,6 +18,7 @@
 
 #define bit_Fast_Rep_String	(1 << 0)
 #define bit_Fast_Copy_Backward	(1 << 1)
+#define bit_Slow_BSF		(1 << 2)
 
 #ifdef	__ASSEMBLER__
 
@@ -35,6 +36,7 @@
 
 # define index_Fast_Rep_String		FEATURE_INDEX_1*FEATURE_SIZE
 # define index_Fast_Copy_Backward	FEATURE_INDEX_1*FEATURE_SIZE
+# define index_Slow_BSF			FEATURE_INDEX_1*FEATURE_SIZE
 
 #else	/* __ASSEMBLER__ */
 
@@ -106,6 +108,7 @@ extern const struct cpu_features *__get_cpu_features (void)
 
 # define index_Fast_Rep_String		FEATURE_INDEX_1
 # define index_Fast_Copy_Backward	FEATURE_INDEX_1
+# define index_Slow_BSF			FEATURE_INDEX_1
 
 #define HAS_ARCH_FEATURE(idx, bit) \
   ((__get_cpu_features ()->feature[idx] & (bit)) != 0)
@@ -116,4 +119,7 @@ extern const struct cpu_features *__get_cpu_features (void)
 #define HAS_FAST_COPY_BACKWARD \
   HAS_ARCH_FEATURE (index_Fast_Copy_Backward, bit_Fast_Copy_Backward)
 
+#define HAS_SLOW_BSF \
+  HAS_ARCH_FEATURE (index_Slow_BSF, bit_Slow_BSF)
+
 #endif	/* __ASSEMBLER__ */