https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111039
Bug ID: 111039
Summary: Unable to coalesce ssa_names
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: krebbel at gcc dot gnu.org
Target Milestone: ---
compiler_corruption_function(flags) {
int nowait = flags & 1048576, isexpand = flags & 8388608;
abcd();
_setjmp(flags);
if (nowait && isexpand)
flags &= 0;
abcde();
}
gcc -mbranch-cost=0 -O t.c
verified with recent GCC: 02ecc9a2632
t.c: In function ‘compiler_corruption_function’:
t.c:1:1: internal compiler error: SSA corruption
1 | compiler_corruption_function(flags) {
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
0x15a657c fail_abnormal_edge_coalesce
/home/andreas/build/../gcc/gcc/tree-ssa-coalesce.cc:1003
0x15a657c coalesce_partitions
/home/andreas/build/../gcc/gcc/tree-ssa-coalesce.cc:1425
0x15a657c coalesce_ssa_name(_var_map*)
/home/andreas/build/../gcc/gcc/tree-ssa-coalesce.cc:1755
0x153d6cf remove_ssa_form
/home/andreas/build/../gcc/gcc/tree-outof-ssa.cc:1065
0x153d6cf rewrite_out_of_ssa(ssaexpand*)
/home/andreas/build/../gcc/gcc/tree-outof-ssa.cc:1323
0xf42073 execute
/home/andreas/build/../gcc/gcc/cfgexpand.cc:6610
This very much looks like another instance of PR71020.
