+ ir_node *mb = get_Block_MacroBlock(n);
+
+ ASSERT_AND_RET(is_Block(mb) || is_Bad(mb), "Block node with wrong MacroBlock", 0);
+
+ if (is_Block(mb) && mb != n) {
+ ir_node *pred;
+
+ /* Blocks with more than one predecessor must be header blocks */
+ ASSERT_AND_RET(get_Block_n_cfgpreds(n) == 1, "partBlock with more than one predecessor", 0);
+ if (get_irg_phase_state(irg) != phase_backend) {
+ pred = get_Block_cfgpred(n, 0);
+ if (is_Proj(pred)) {
+ /* the predecessor MUST be a regular Proj */
+ ir_node *frag_op = get_Proj_pred(pred);
+ ASSERT_AND_RET(
+ is_fragile_op(frag_op) && get_Proj_proj(pred) == pn_Generic_X_regular,
+ "partBlock with non-regular predecessor", 0);
+ } else {
+ /* We allow Jmps to be predecessors of partBlocks. This can happen due to optimization
+ of fragile nodes during construction. It does not violate our assumption of dominance
+ so let it. */
+ ASSERT_AND_RET(is_Jmp(pred) || is_Bad(pred),
+ "partBlock with non-regular predecessor", 0);
+ }
+ } else {
+ /* relax in backend: Bound nodes are probably lowered into conditional jumps */
+ }
+ }