- BugFix: Do not optimize dead blocks: They might even be immature when SSA construct...

restartet ...

[r19222]

diff --git a/ir/ir/iropt.c b/ir/ir/iropt.c
index ac9fe39..ee92310 100644 (file)
--- a/ir/ir/iropt.c
+++ b/ir/ir/iropt.c
@@ -722,10 +722,16 @@ static ir_op_ops *firm_set_default_computed_value(ir_opcode code, ir_op_ops *ops
 static ir_node *equivalent_node_Block(ir_node *n)
 {
        ir_node *oldn = n;
-       int n_preds   = get_Block_n_cfgpreds(n);
+       int     n_preds;
 
-       /* The Block constructor does not call optimize, but mature_immBlock
-       calls the optimization. */
+       /* don't optimize dead blocks */
+       if (is_Block_dead(n))
+               return n;
+
+       n_preds = get_Block_n_cfgpreds(n);
+
+       /* The Block constructor does not call optimize, but mature_immBlock()
+          calls the optimization. */
        assert(get_Block_matured(n));
 
        /* Straightening: a single entry Block following a single exit Block