From: Uros Bizjak <ubizjak@gmail.com>
Date: Mon, 22 Jun 2015 13:54:58 +0000 (+0200)
Subject: re PR target/65871 (bzhi builtin/intrinsic wrongly assumes bzhi instruction doesn... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=1ea0e674b0a0ec75772a74783ad0d21454cd5d86;p=gcc.git

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
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 9bfaa22f49b..6ca98cf10f7 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+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
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index 24fccfca53d..2df91c48d4d 100644
--- a/gcc/config/i386/i386.c
+++ b/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: