https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96424
Bug ID: 96424
Summary: ICE: verify_flow_info failed (error: wrong outgoing
edge flags at end of bb 23); or ICE: Segmentation
fault (in
expand_omp_for_init_vars/contains_struct_check)
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Keywords: openmp
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
1.
g++-11.0.0-alpha20200726 snapshot (g:39ddfef9a5c24acf6412236f52f6716c8e0ebc9e)
ICEs when compiling the following testcase, reduced from
libgomp/testsuite/libgomp.c/loop-18.c, w/ -fbranch-probabilities
-fnon-call-exceptions -fopenmp:
int
main ()
{
int i, j;
#pragma omp for collapse (2)
for (i = 0; i < 1; ++i)
for (j = 0; j <= i; ++j)
{
}
return 0;
}
% g++-11.0.0 -fbranch-probabilities -fnon-call-exceptions -fopenmp -c
qr6y7wzi.c
qr6y7wzi.c: In function 'int main()':
qr6y7wzi.c:13:1: error: wrong outgoing edge flags at end of bb 23
13 | }
| ^
during IPA pass: profile
qr6y7wzi.c:13:1: internal compiler error: verify_flow_info failed
0xb80b56 verify_flow_info()
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/cfghooks.c:269
0x105e7e7 checking_verify_flow_info
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/cfghooks.h:212
0x105e7e7 gimple_flow_call_edges_add
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/tree-cfg.c:8622
0xf81fdd branch_prob(bool)
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/profile.c:1099
0x10fe836 tree_profiling
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/tree-profile.c:779
0x10fe836 execute
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/tree-profile.c:885
2.
Replacing <= w/ < yields the following instead:
--- qr6y7wzi.c
+++ #<buffer qr6y7wzi.c>
@@ -5,7 +5,7 @@ main ()
#pragma omp for collapse (2)
for (i = 0; i < 1; ++i)
- for (j = 0; j <= i; ++j)
+ for (j = 0; j < i; ++j)
{
}
% g++-11.0.0 -fbranch-probabilities -fnon-call-exceptions -fopenmp -c
qr6y7wzi.c
during GIMPLE pass: ompexp
qr6y7wzi.c: In function 'int main()':
qr6y7wzi.c:6:9: internal compiler error: Segmentation fault
6 | #pragma omp for collapse (2)
| ^~~
0x1028baf crash_signal
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/toplev.c:328
0xec69ae contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/tree.h:3416
0xec69ae expand_omp_for_init_vars
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/omp-expand.c:2271
0xeccbe2 expand_omp_for_static_nochunk
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/omp-expand.c:4969
0xedc6b4 expand_omp_for
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/omp-expand.c:7421
0xedcb8a expand_omp
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/omp-expand.c:9691
0xede96c execute_expand_omp
/var/tmp/portage/sys-devel/gcc-11.0.0_alpha20200726/work/gcc-11-20200726/gcc/omp-expand.c:9920
