Prevent endless recursion in if-conv in endless loops.

diff --git a/ir/opt/ifconv.c b/ir/opt/ifconv.c
index 04502fc..b22c9db 100644 (file)
--- a/ir/opt/ifconv.c
+++ b/ir/opt/ifconv.c
@@ -283,6 +283,8 @@ restart:
                ir_cdep* cdep;
 
                pred0 = get_Block_cfgpred_block(block, i);
+               if (pred0 == block) continue;
+
                for (cdep = find_cdep(pred0); cdep != NULL; cdep = get_cdep_next(cdep)) {
                        const ir_node* dependency = get_cdep_node(cdep);
                        ir_node* projx0 = walk_to_projx(pred0, dependency);
@@ -310,6 +312,7 @@ restart:
                                dbg_info* cond_dbg;
 
                                pred1 = get_Block_cfgpred_block(block, j);
+                               if (pred1 == block) continue;
 
                                if (!is_cdep_on(pred1, dependency)) continue;