Fixes testcase opt/gzip_error

The backend sometimes creates ProjM with a temporarily broken pn,
so the verifier must not check them.

[r28392]

diff --git a/ir/be/ia32/ia32_transform.c b/ir/be/ia32/ia32_transform.c
index 5b3de32..6832fcf 100644 (file)
--- a/ir/be/ia32/ia32_transform.c
+++ b/ir/be/ia32/ia32_transform.c
@@ -1498,8 +1498,13 @@ static ir_node *transform_AM_mem(ir_node *const block,
                        ins[n++] = be_transform_node(pred);
                }
 
-               ins[n++] = am_mem;
+               if (n==1 && ins[0] == am_mem) {
+                       return am_mem;
+                       /* creating a new Sync and relying on CSE may fail,
+                        * if am_mem is a ProjM, which does not yet verify. */
+               }
 
+               ins[n++] = am_mem;
                return new_r_Sync(block, n, ins);
        } else {
                ir_node *ins[2];