re PR target/65871 (bzhi builtin/intrinsic wrongly assumes bzhi instruction…

re PR target/65871 (bzhi builtin/intrinsic wrongly assumes bzhi instruction doesn't set the ZF flag)

	PR target/65871
	* config/i386/i386.c (ix86_rtx_costs) <case COMPARE>: Ignore the
	cost of embedded comparison.

From-SVN: r224729

gcc/ChangeLog

+2015-06-22  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/65871
+	* config/i386/i386.c (ix86_rtx_costs) <case COMPARE>: Ignore the
+	cost of embedded comparison.
+
 2015-06-22  Bill Schmidt  <wschmidt@linux.vnet.ibm.com>
 
 	PR target/65914

gcc/config/i386/i386.c

@@ -42531,6 +42531,12 @@ ix86_rtx_costs (rtx x, int code_i, int outer_code_i, int opno, int *total,
 		    + rtx_cost (const1_rtx, outer_code, opno, speed));
 	  return true;
 	}
+
+      /* The embedded comparison operand is completely free.  */
+      if (!general_operand (XEXP (x, 0), GET_MODE (XEXP (x, 0)))
+	  && XEXP (x, 1) == const0_rtx)
+	*total = 0;
+
       return false;
 
     case FLOAT_EXTEND: