From patchwork Thu Jul  1 22:54:18 2010
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Subject: PATCH: PR web/44775: union_match_dups failed to check NULL *ref
From: "H.J. Lu" <hongjiu.lu@intel.com>
X-Patchwork-Id: 57605
Message-Id: <20100701225418.GA19170@intel.com>
To: gcc-patches@gcc.gnu.org
Date: Thu, 1 Jul 2010 15:54:18 -0700

Hi,

This patch adds check for NULL *ref. OK to install?

Thanks.


H.J.

---
2010-07-01  H.J. Lu  <hongjiu.lu@intel.com>

	PR web/44775
	* web.c (union_match_dups): Check NULL *ref.

diff --git a/gcc/web.c b/gcc/web.c
index ff91733..4b2ce36 100644
--- a/gcc/web.c
+++ b/gcc/web.c
@@ -123,7 +123,8 @@ union_match_dups (rtx insn, struct web_entry *def_entry,
 	if (DF_REF_LOC (*ref) == recog_data.operand_loc[op])
 	  break;
 
-      (*fun) (use_entry + DF_REF_ID (*dupref), entry + DF_REF_ID (*ref));
+      if (*ref)
+	(*fun) (use_entry + DF_REF_ID (*dupref), entry + DF_REF_ID (*ref));
     }
 }