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[PATCH,i386] cpuid function for prefetchw
- From: "Gopalasubramanian, Ganesh" <Ganesh dot Gopalasubramanian at amd dot com>
- To: "gcc-patches at gcc dot gnu dot org" <gcc-patches at gcc dot gnu dot org>
- Date: Mon, 13 Aug 2012 09:29:45 +0000
- Subject: [PATCH,i386] cpuid function for prefetchw
Hello,
To get the prefetchw cpuid flag, cpuid
function 0x80000001 needs to be called.
Previous to patch, function 0x7 is called.
Bootstrapping and "make -k check" passes without failures.
Ok for trunk?
Regards
Ganesh
2012-08-13 Ganesh Gopalasubramanian <Ganesh.Gopalasubramanian@amd.com>
PR driver/54210
* config/i386/driver-i386.c (host_detect_local_cpu): Call
cpuid function 0x80000001 to get the prfchw cpuid flag.
Index: gcc/config/i386/driver-i386.c
===================================================================
--- gcc/config/i386/driver-i386.c (revision 189996)
+++ gcc/config/i386/driver-i386.c (working copy)
@@ -467,7 +467,6 @@
has_bmi2 = ebx & bit_BMI2;
has_fsgsbase = ebx & bit_FSGSBASE;
has_rdseed = ebx & bit_RDSEED;
- has_prfchw = ecx & bit_PRFCHW;
}
/* Check cpuid level of extended features. */ @@ -491,6 +490,7 @@
has_longmode = edx & bit_LM;
has_3dnowp = edx & bit_3DNOWP;
has_3dnow = edx & bit_3DNOW;
+ has_prfchw = ecx & bit_PRFCHW;
}
if (!arch