From: jakub <jakub@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 3 Dec 2014 20:35:08 +0000 (+0000)
Subject: 	PR c/59708
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=d0a9f10b71d18d00d772314a89ab9fa0937c876b;p=thirdparty%2Fgcc.git

	PR c/59708
	* expmed.c (expand_widening_mult): Return const0_rtx if
	coeff is 0.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@218331 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index eff109f584c3..aa2f9589e5f5 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,5 +1,9 @@
 2014-12-03  Jakub Jelinek  <jakub@redhat.com>
 
+	PR c/59708
+	* expmed.c (expand_widening_mult): Return const0_rtx if
+	coeff is 0.
+
 	* doc/gimple.texi (gimple_build_assign_with_ops): Remove.
 	(gimple_build_assign): Document the new overloads.
 
diff --git a/gcc/expmed.c b/gcc/expmed.c
index 0304e46ebb35..708f04f11c5b 100644
--- a/gcc/expmed.c
+++ b/gcc/expmed.c
@@ -3289,6 +3289,9 @@ expand_widening_mult (machine_mode mode, rtx op0, rtx op1, rtx target,
       enum mult_variant variant;
       struct algorithm algorithm;
 
+      if (coeff == 0)
+	return CONST0_RTX (mode);
+
       /* Special case powers of two.  */
       if (EXACT_POWER_OF_2_OR_ZERO_P (coeff))
 	{