i386-common.c: Handle LZCNT.

2013-06-22  Sriraman Tallam  <tmsriram@google.com>

	* common/config/i386/i386-common.c: Handle LZCNT.

From-SVN: r200347

gcc/ChangeLog

+2013-06-22  Sriraman Tallam  <tmsriram@google.com>
+
+	* common/config/i386/i386-common.c: Handle LZCNT.
+
 2013-06-22  Andi Kleen  <ak@linux.intel.com>
 
 	* doc/extend.texi: Use __atomic_store_n instead of

gcc/common/config/i386/i386-common.c

@@ -87,6 +87,7 @@ along with GCC; see the file COPYING3.  If not see
 
 #define OPTION_MASK_ISA_BMI_SET OPTION_MASK_ISA_BMI
 #define OPTION_MASK_ISA_BMI2_SET OPTION_MASK_ISA_BMI2
+#define OPTION_MASK_ISA_LZCNT_SET OPTION_MASK_ISA_LZCNT
 #define OPTION_MASK_ISA_TBM_SET OPTION_MASK_ISA_TBM
 #define OPTION_MASK_ISA_POPCNT_SET OPTION_MASK_ISA_POPCNT
 #define OPTION_MASK_ISA_CX16_SET OPTION_MASK_ISA_CX16
@@ -154,6 +155,7 @@ along with GCC; see the file COPYING3.  If not see
 #define OPTION_MASK_ISA_ABM_UNSET OPTION_MASK_ISA_ABM
 #define OPTION_MASK_ISA_BMI_UNSET OPTION_MASK_ISA_BMI
 #define OPTION_MASK_ISA_BMI2_UNSET OPTION_MASK_ISA_BMI2
+#define OPTION_MASK_ISA_LZCNT_UNSET OPTION_MASK_ISA_LZCNT
 #define OPTION_MASK_ISA_TBM_UNSET OPTION_MASK_ISA_TBM
 #define OPTION_MASK_ISA_POPCNT_UNSET OPTION_MASK_ISA_POPCNT
 #define OPTION_MASK_ISA_CX16_UNSET OPTION_MASK_ISA_CX16
@@ -438,6 +440,18 @@ ix86_handle_option (struct gcc_options *opts,
 	}
       return true;
 
+    case OPT_mlzcnt:
+      if (value)
+	{
+	  opts->x_ix86_isa_flags |= OPTION_MASK_ISA_LZCNT_SET;
+	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_LZCNT_SET;
+	}
+      else
+	{
+	  opts->x_ix86_isa_flags &= ~OPTION_MASK_ISA_LZCNT_UNSET;
+	  opts->x_ix86_isa_flags_explicit |= OPTION_MASK_ISA_LZCNT_UNSET;
+	}
+
     case OPT_mtbm:
       if (value)
 	{