Hello, I use gsi_remove to remove some call statement. Then it comes out some error message after the last basic block. But I didn't use the function(ex. like dominated_by_p, get_continuation_for_phi, etc) in these error message. After that, I add bitmap_set_bit to fix, but it still the same. Here is the error message: 0x9daf2f crash_signal /home/cc/gcc/src/gcc/toplev.c:337 0x6dc947 dominated_by_p(cdi_direction, basic_block_def const*, basic_block_def const*) /home/cc/gcc/src/gcc/dominance.c:1117 0xa9a216 get_continuation_for_phi(gimple*, ao_ref*, unsigned int*, bitmap_head**, bool, void* (*)(ao_ref*, tree_node*, void*, bool*), void*) /home/cc/gcc/src/gcc/tree-ssa-alias.c:2780 0xa9a605 walk_non_aliased_vuses(ao_ref*, tree_node*, void* (*)(ao_ref*, tree_node*, unsigned int, void*), void* (*)(ao_ref*, tree_node*, void*, bool*), tree_node* (*)(tree_node*), void*) /home/cc/gcc/src/gcc/tree-ssa-alias.c:2862 0xb2f1c9 vn_reference_lookup(tree_node*, tree_node*, vn_lookup_kind, vn_reference_s**, bool) /home/cc/gcc/src/gcc/tree-ssa-sccvn.c:2462 0xb31b50 visit_reference_op_load /home/cc/gcc/src/gcc/tree-ssa-sccvn.c:3703 0xb31b50 visit_use /home/cc/gcc/src/gcc/tree-ssa-sccvn.c:4043 0xb33c2c process_scc /home/cc/gcc/src/gcc/tree-ssa-sccvn.c:4274 0xb33c2c extract_and_process_scc_for_name /home/cc/gcc/src/gcc/tree-ssa-sccvn.c:4361 0xb33c2c DFS /home/cc/gcc/src/gcc/tree-ssa-sccvn.c:4413 0xb341cd sccvn_dom_walker::before_dom_children(basic_block_def*) /home/cc/gcc/src/gcc/tree-ssa-sccvn.c:4879 0xfcb6aa dom_walker::walk(basic_block_def*) /home/cc/gcc/src/gcc/domwalk.c:265 0xb34cfa run_scc_vn(vn_lookup_kind) /home/cc/gcc/src/gcc/tree-ssa-sccvn.c:4990 0xb0a064 execute /home/cc/gcc/src/gcc/tree-ssa-pre.c:5218 Thanks. Lee
