https://gcc.gnu.org/bugzilla/show_bug.cgi?id=98786
Bug ID: 98786
Summary: ICE: SSA corruption (Unable to coalesce ssa_names 2
and 10 which are marked as MUST COALESCE.)
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
gcc-11.0.0-alpha20210117 snapshot (g:0f4c8f517b7954e113afb4d5c7212123c8ee2418)
ICEs when compiling the following testcase w/ -O1 -fno-tree-dce:
void
func_30 (void);
int __attribute__ ((pure, returns_twice))
func_38 (int g_15, int p_39)
{
return !!g_15 ? p_39 : 0;
}
void
func_26 (int func_26___trans_tmp_1)
{
long int l_37 = 0;
int __trans_tmp_1;
func_26___trans_tmp_1 = func_38 (func_26___trans_tmp_1, 1);
__trans_tmp_1 = func_38 (func_26___trans_tmp_1, l_37);
l_37 = 1;
func_30 ();
}
% gcc-11.0.0 -O1 -fno-tree-dce -c rm463xcz.c
Unable to coalesce ssa_names 2 and 10 which are marked as MUST COALESCE.
l_37_2(ab) and l_37_10(ab)
during RTL pass: expand
rm463xcz.c: In function 'func_26':
rm463xcz.c:11:1: internal compiler error: SSA corruption
11 | func_26 (int func_26___trans_tmp_1)
| ^~~~~~~
0xf1ac45 fail_abnormal_edge_coalesce
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20210117/work/gcc-11-20210117/gcc/tree-ssa-coalesce.c:1003
0xf1ac45 coalesce_partitions
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20210117/work/gcc-11-20210117/gcc/tree-ssa-coalesce.c:1425
0xf1ac45 coalesce_ssa_name(_var_map*)
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20210117/work/gcc-11-20210117/gcc/tree-ssa-coalesce.c:1755
0xeb68cc remove_ssa_form
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20210117/work/gcc-11-20210117/gcc/tree-outof-ssa.c:1065
0xeb68cc rewrite_out_of_ssa(ssaexpand*)
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20210117/work/gcc-11-20210117/gcc/tree-outof-ssa.c:1323
0x95fdd0 execute
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20210117/work/gcc-11-20210117/gcc/cfgexpand.c:6533
