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 @@