* web.c (union_defs): use all defs of an instruction to create a

        union with a read/write use


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@83882 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 7 insertions, 5 deletions

diff --git a/gcc/web.c b/gcc/web.c
index 11f2caa6cd2..91dbb90e3c3 100644
--- a/gcc/web.c
+++ b/gcc/web.c
@@ -160,11 +160,13 @@ union_defs (struct df *df, struct ref *use, struct web_entry *def_entry,
     {
       struct df_link *link = DF_INSN_DEFS (df, DF_REF_INSN (use));
 
-      while (DF_REF_REAL_REG (link->ref) != DF_REF_REAL_REG (use))
-	link = link->next;
-
-      unionfind_union (use_entry + DF_REF_ID (use),
-		       def_entry + DF_REF_ID (link->ref));
+      while (link)
+	{
+	  if (DF_REF_REAL_REG (link->ref) == DF_REF_REAL_REG (use))
+	    unionfind_union (use_entry + DF_REF_ID (use),
+			     def_entry + DF_REF_ID (link->ref));
+	  link = link->next;
+	}
     }
 }