(combine_instructions): Initialize undobuf in the event

`gen_rtx_combine' is called before `try_combine'.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@3359 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/combine.c b/gcc/combine.c
index 33bac48..8be5a05 100644 (file)
--- a/gcc/combine.c
+++ b/gcc/combine.c
@@ -406,6 +406,7 @@ combine_instructions (f, nregs)
   combine_merges = 0;
   combine_extras = 0;
   combine_successes = 0;
+  undobuf.num_undo = previous_num_undos = 0;
 
   combine_max_regno = nregs;