Perform test for Arom x86-64 in central place and handle it.

There will be more than one function which, in multiarch mode, wants
to use SSSE3.  We should not test in each of them for Atoms with
slow SSSE3.  Instead, disable the SSSE3 bit in the startup code for
such machines.

ChangeLog

@@ -1,5 +1,10 @@
 2009-07-23  Ulrich Drepper  <drepper@redhat.com>
 
+	* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features): Reset
+	SSSE3 bit for Atoms.
+	* sysdeps/x86_64/multiarch/strcpy.S: New need to perform Atom test
+	here anymore.
+
 	* posix/tst-rfc3484.c (do_test): Initialize entire sockaddr_in
 	structure before copying it to avoid warning.
 	* posix/tst-rfc3484-2.c (do_test): Likewise.

sysdeps/x86_64/multiarch/init-arch.c

@@ -68,7 +68,13 @@ __init_cpu_features (void)
 	  __cpu_features.model += extended_model;
 	}
       else if (__cpu_features.family == 0x06)
-	__cpu_features.model += extended_model;
+	{
+	  __cpu_features.model += extended_model;
+
+	  if (__cpu_features.model == 0x1c)
+	    /* Avoid SSSE3 on Atom since it is slow.  */
+	    __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx &= ~(1 << 9);
+	}
     }
   /* This spells out "AuthenticAMD".  */
   else if (ebx == 0x68747541 && ecx == 0x444d4163 && edx == 0x69746e65)

sysdeps/x86_64/multiarch/strcpy.S

@@ -64,16 +64,9 @@ ENTRY(STRCPY)
 	call	__init_cpu_features
 1:	leaq	STRCPY_SSE2(%rip), %rax
 	testl	$(1<<9), __cpu_features+CPUID_OFFSET+COMMON_CPUID_INDEX_1*CPUID_SIZE+CPUID_ECX_OFFSET(%rip)
-	jz	3f
-/* Avoid SSSE3 strcpy on Atom since it is slow.  */
-	cmpl	$1, __cpu_features+KIND_OFFSET(%rip)
-	jne	2f
-	cmpl	$6, __cpu_features+FAMILY_OFFSET(%rip)
-	jne	2f
-	cmpl	$28, __cpu_features+MODEL_OFFSET(%rip)
-	jz	3f
-2:	leaq	STRCPY_SSSE3(%rip), %rax
-3:	ret
+	jz	2f
+	leaq	STRCPY_SSSE3(%rip), %rax
+2:	ret
 END(STRCPY)
 
 	.section .text.ssse3,"ax",@progbits