re PR driver/54210 (gcc unable to detect -mprfchw flag in bulldozer machines)

	PR driver/54210
	* config/i386/driver-i386.c (host_detect_local_cpu): Test bit_PRFCHW
	bit of CPUID 0x80000001 %ecx instead of CPUID 7 %ecx.
	* config/i386/cpuid.h (bits_PRFCHW): Move definition to CPUID
	0x80000001 %ecx flags.

Co-Authored-By: Jakub Jelinek <jakub@redhat.com>

From-SVN: r190345

gcc/ChangeLog

+2012-08-13  Ganesh Gopalasubramanian  <Ganesh.Gopalasubramanian@amd.com>
+	    Jakub Jelinek  <jakub@redhat.com>
+
+	PR driver/54210
+	* config/i386/driver-i386.c (host_detect_local_cpu): Test bit_PRFCHW
+	bit of CPUID 0x80000001 %ecx instead of CPUID 7 %ecx.
+	* config/i386/cpuid.h (bits_PRFCHW): Move definition to CPUID
+	0x80000001 %ecx flags.
+
 2012-08-13  Richard Guenther  <rguenther@suse.de>
 
 	* tree-cfg.c (print_loop): Avoid ICEing for loops marked for

gcc/config/i386/cpuid.h

 /*
- * Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
+ * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012
+ * Free Software Foundation, Inc.
  *
  * This file is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License as published by the
@@ -52,6 +53,7 @@
 #define bit_LAHF_LM	(1 << 0)
 #define bit_ABM		(1 << 5)
 #define bit_SSE4a	(1 << 6)
+#define bit_PRFCHW	(1 << 8)
 #define bit_XOP         (1 << 11)
 #define bit_LWP 	(1 << 15)
 #define bit_FMA4        (1 << 16)
@@ -69,7 +71,6 @@
 #define bit_HLE	(1 << 4)
 #define bit_AVX2	(1 << 5)
 #define bit_BMI2	(1 << 8)
-#define bit_PRFCHW	(1 << 8)
 #define bit_RTM	(1 << 11)
 #define bit_RDSEED	(1 << 18)
 #define bit_ADX	(1 << 19)

gcc/config/i386/driver-i386.c

 /* Subroutines for the gcc driver.
-   Copyright (C) 2006, 2007, 2008, 2010 Free Software Foundation, Inc.
+   Copyright (C) 2006, 2007, 2008, 2010, 2011, 2012
+   Free Software Foundation, Inc.
 
 This file is part of GCC.
 
@@ -467,7 +468,6 @@ const char *host_detect_local_cpu (int argc, const char **argv)
       has_bmi2 = ebx & bit_BMI2;
       has_fsgsbase = ebx & bit_FSGSBASE;
       has_rdseed = ebx & bit_RDSEED;
-      has_prfchw = ecx & bit_PRFCHW;
       has_adx = ebx & bit_ADX;
     }
 
@@ -488,6 +488,7 @@ const char *host_detect_local_cpu (int argc, const char **argv)
       has_xop = ecx & bit_XOP;
       has_tbm = ecx & bit_TBM;
       has_lzcnt = ecx & bit_LZCNT;
+      has_prfchw = ecx & bit_PRFCHW;
 
       has_longmode = edx & bit_LM;
       has_3dnowp = edx & bit_3DNOWP;