From: H.J. Lu <hongjiu.lu@intel.com>
Date: Fri, 3 Jun 2011 11:01:25 +0000 (-0400)
Subject: Assume Intel Core i3/i5/i7 processor if AVX is available
X-Git-Tag: glibc-2.14.1~49
X-Git-Url: https://sourceware.org/git/?a=commitdiff_plain;h=3d29045b5e8329d97693eda8d98f1d1e60b99c8f;p=glibc.git

Assume Intel Core i3/i5/i7 processor if AVX is available
---

diff --git a/ChangeLog b/ChangeLog
index eee3d1bfd9..6a11ec67ea 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2011-06-02  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* sysdeps/x86_64/multiarch/init-arch.c (__init_cpu_features):
+	Assume Intel Core i3/i5/i7 processor if AVX is available.
+
 2011-05-31  Andreas Schwab  <schwab@redhat.com>
 
 	* nscd/nscd_getserv_r.c (nscd_getserv_r): Don't free non-malloced
diff --git a/sysdeps/x86_64/multiarch/init-arch.c b/sysdeps/x86_64/multiarch/init-arch.c
index 34ec2df2d5..809d105c77 100644
--- a/sysdeps/x86_64/multiarch/init-arch.c
+++ b/sysdeps/x86_64/multiarch/init-arch.c
@@ -74,6 +74,7 @@ __init_cpu_features (void)
 	}
       else if (family == 0x06)
 	{
+	  ecx = __cpu_features.cpuid[COMMON_CPUID_INDEX_1].ecx;
 	  model += extended_model;
 	  switch (model)
 	    {
@@ -83,6 +84,12 @@ __init_cpu_features (void)
 	      __cpu_features.feature[index_Slow_BSF] |= bit_Slow_BSF;
 	      break;
 
+	    default:
+	      /* Unknown family 0x06 processors.  Assuming this is one
+	         of Core i3/i5/i7 processors if AVX is available.  */
+	      if ((ecx & bit_AVX) == 0)
+		break;
+
 	    case 0x1a:
 	    case 0x1e:
 	    case 0x1f: