From: Martin Liska <mliska@suse.cz>
Date: Wed, 3 Sep 2014 12:42:01 +0000 (+0200)
Subject: Fix for tree-ssa-pre
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=27732ffd5852437ad67b4074edb70b8c29316590;p=gcc.git

Fix for tree-ssa-pre

	* tree-ssa-sccvn.c (vn_reference_lookup_call): default (NULL) value
	is set to preserve uninitialized value for vnresult.

From-SVN: r214873
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index cfec7b4c32f..e59e0d754b6 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,8 @@
+2014-09-03  Martin Liska  <mliska@suse.cz>
+
+	* tree-ssa-sccvn.c (vn_reference_lookup_call): default (NULL) value
+	is set to set uninitialized value for vnresult.
+
 2014-09-03  Chung-Ju Wu  <jasonwucj@gmail.com>
 
 	* config/nds32/nds32.c (nds32_must_pass_in_stack): New implementation
diff --git a/gcc/tree-ssa-sccvn.c b/gcc/tree-ssa-sccvn.c
index 1bcbde35f8a..44656ea0370 100644
--- a/gcc/tree-ssa-sccvn.c
+++ b/gcc/tree-ssa-sccvn.c
@@ -2146,6 +2146,9 @@ void
 vn_reference_lookup_call (gimple call, vn_reference_t *vnresult,
 			  vn_reference_t vr)
 {
+  if (vnresult)
+    *vnresult = NULL;
+
   tree vuse = gimple_vuse (call);
 
   vr->vuse = vuse ? SSA_VAL (vuse) : NULL_TREE;