https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82337
Bug ID: 82337
Summary: -O2: ICE: SSA corruption at tree-ssa-coalesce.c:1010
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ivo.raisr at oracle dot com
Target Milestone: ---
With gcc 8.0, 7.2 and 6.3.1 we hit internal compiler error:
Unable to coalesce ssa_names 7 and 15 which are marked as MUST COALESCE.
i_7(ab) and i_15(ab)
during RTL pass: expand
reduced-3.c:12:6: internal compiler error: SSA corruption
void g(void) {
^
0xe24c8c fail_abnormal_edge_coalesce
../../gcc-trunk/gcc/tree-ssa-coalesce.c:1010
0xe24c8c coalesce_partitions
../../gcc-trunk/gcc/tree-ssa-coalesce.c:1399
0xe24c8c coalesce_ssa_name()
../../gcc-trunk/gcc/tree-ssa-coalesce.c:1886
0xdca93b remove_ssa_form
../../gcc-trunk/gcc/tree-outof-ssa.c:948
0xdca93b rewrite_out_of_ssa(ssaexpand*)
../../gcc-trunk/gcc/tree-outof-ssa.c:1172
0x992d70 execute
../../gcc-trunk/gcc/cfgexpand.c:6164
Full pre-processed sources are not publicly available.
C-reduce was able to produce "reduced-3.bare.c" which I slightly reformatted to
make it more readable: "reduced-3.c". Both files attached.
Reproduce as:
$ gcc -c reduced-3.c -O2
