https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97333
Bug ID: 97333 Summary: [gimple_can_duplicate_bb_p == false, tree-ssa-threadupdate] ICE in duplicate_block, at cfghooks.c:1093 Product: gcc Version: 11.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: vries at gcc dot gnu.org Target Milestone: --- With this patch: ... diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c index 406441751a9..b9168755155 100644 --- a/gcc/tree-cfg.c +++ b/gcc/tree-cfg.c @@ -6213,7 +6213,7 @@ gimple_split_block_before_cond_jump (basic_block bb) static bool gimple_can_duplicate_bb_p (const_basic_block bb ATTRIBUTE_UNUSED) { - return true; + return false; } /* Create a duplicate of the basic block BB. NOTE: This does not ... we run into: ... spawn -ignore SIGHUP /dev/shm/tdevries/data/master/2020-10-07T08-04-46-02-00-c475cfa435b/build/gcc/xgcc -B/dev/shm/tdevries/data/master/2020-10-07T08-04-46-02-00-c475cfa435b/build/gcc/ -fdiagnostics-plain-output -O1 -w -c -o 20041018-1.o /labs/tdevries/gcc/src/gcc/testsuite/gcc.c-torture/compile/20041018-1.c^M during GIMPLE pass: dom^M /labs/tdevries/gcc/src/gcc/testsuite/gcc.c-torture/compile/20041018-1.c: In function 'foo':^M /labs/tdevries/gcc/src/gcc/testsuite/gcc.c-torture/compile/20041018-1.c:2:1: internal compiler error: in duplicate_block, at cfghooks.c:1093^M 0xbfebaf duplicate_block(basic_block_def*, edge_def*, basic_block_def*, copy_bb_data*)^M /labs/tdevries/gcc/src/gcc/cfghooks.c:1093^M 0x16d794b create_block_for_threading^M /labs/tdevries/gcc/src/gcc/tree-ssa-threadupdate.c:342^M 0x16d90e7 ssa_create_duplicates(redirection_data**, ssa_local_info_t*)^M /labs/tdevries/gcc/src/gcc/tree-ssa-threadupdate.c:1130^M 0x16dfe86 void hash_table<redirection_data, false, xcallocator>::traverse_noresize<ssa_local_info_t*, &(ssa_create_duplicates(redirection_data**, ssa_local_info_t*))>(ssa_local_info_t*)^M /labs/tdevries/gcc/src/gcc/hash-table.h:1081^M 0x16df31a void hash_table<redirection_data, false, xcallocator>::traverse<ssa_local_info_t*, &(ssa_create_duplicates(redirection_data**, ssa_local_info_t*))>(ssa_local_info_t*)^M /labs/tdevries/gcc/src/gcc/hash-table.h:1102^M 0x16d9dff thread_block_1^M /labs/tdevries/gcc/src/gcc/tree-ssa-threadupdate.c:1495^M 0x16d9ee5 thread_block^M /labs/tdevries/gcc/src/gcc/tree-ssa-threadupdate.c:1539^M 0x16da3d7 thread_through_loop_header^M /labs/tdevries/gcc/src/gcc/tree-ssa-threadupdate.c:1781^M 0x16dc767 thread_through_all_blocks(bool)^M /labs/tdevries/gcc/src/gcc/tree-ssa-threadupdate.c:2667^M 0x15522d2 execute^M /labs/tdevries/gcc/src/gcc/tree-ssa-dom.c:776^M ...