1 The problem here is that have two basic block forwarders which go to the
2 same basic block but destination of two different eh regions. We cannot
3 forward both of these basic blocks to that other basic block.
5 The way I fixed the issue is to make sure that if we removing
6 a forwarder block which is coming in from a EH edge, make sure
7 that the destination basic block have only one single predecessor.
8 Yes this is too strong but there is no simple way to check if a basic
9 block is the destination of a different eh region.
11 --- gcc/gcc/tree-cfgcleanup.c 19 Aug 2005 18:52:55 -0000 2.7
12 +++ gcc/gcc/tree-cfgcleanup.c 24 Sep 2005 23:30:54 -0000
13 @@ -392,7 +392,18 @@ remove_forwarder_block (basic_block bb,
18 + /* Check to make sure that we can remove a forwarder block for eh edges. */
19 + FOR_EACH_EDGE (e, ei, bb->preds)
21 + /* This check is too strong, we should also be checking eh regions
22 + but this is much harder. */
23 + if (e->flags & EDGE_EH)
25 + if (!single_pred_p (dest))
30 /* Redirect the edges. */
31 for (ei = ei_start (bb->preds); (e = ei_safe_edge (ei)); )