https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83089
Bug ID: 83089
Summary: [8 Regression] ICE: Segmentation fault (in
instantiate_scev_name)
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
gcc-8.0.0-alpha20171119 snapshot (r254939) ICEs when compiling the following
snippet w/ -O2 (-O3, -Ofast) -ftree-loop-if-convert -ftree-parallelize-loops=2:
int rl, s8;
void
it (int zy, short int el)
{
int hb;
while (el != 0)
{
hb = el;
for (rl = 0; rl < 200; ++rl)
{
for (s8 = 0; s8 < 2; ++s8)
{
}
if (s8 < 3)
zy = hb;
if (hb == 0)
++s8;
zy += (s8 != -1);
}
el = zy;
}
}
% gcc-8.0.0-alpha20171119 -O2 -ftree-loop-if-convert -ftree-parallelize-loops=2
-c harzrp6v.c
during GIMPLE pass: cunroll
harzrp6v.c: In function 'it':
harzrp6v.c:4:1: internal compiler error: Segmentation fault
it (int zy, short int el)
^~
0xc6c84f crash_signal
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/toplev.c:325
0xd1ce15 tree_check(tree_node*, char const*, int, char const*, tree_code)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree.h:3089
0xd1ce15 instantiate_scev_name
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-scalar-evolution.c:2359
0xd1dae5 instantiate_scev_convert
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-scalar-evolution.c:2611
0xd1d36f instantiate_scev_r
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-scalar-evolution.c:2746
0xd1dd1f resolve_mixers(loop*, tree_node*, bool*)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-scalar-evolution.c:2842
0xd1fe88 analyze_scalar_evolution_in_loop
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-scalar-evolution.c:2210
0xd1ff95 simple_iv_with_niters(loop*, loop*, tree_node*, affine_iv*,
tree_node**, bool)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-scalar-evolution.c:3325
0xd857d4 number_of_iterations_exit_assumptions(loop*, edge_def*,
tree_niter_desc*, gcond**, bool)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-ssa-loop-niter.c:2358
0xd85b81 number_of_iterations_exit_assumptions(loop*, edge_def*,
tree_niter_desc*, gcond**, bool)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-ssa-loop-niter.c:2455
0xd85b81 number_of_iterations_exit(loop*, edge_def*, tree_niter_desc*, bool,
bool)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-ssa-loop-niter.c:2442
0xd1ba7d number_of_latch_executions(loop*)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-scalar-evolution.c:2902
0xd875df estimate_numbers_of_iterations(loop*)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-ssa-loop-niter.c:3914
0xd87d27 estimate_numbers_of_iterations(function*)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-ssa-loop-niter.c:4149
0xd67a51 tree_unroll_loops_completely(bool, bool)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-ssa-loop-ivcanon.c:1367
0xd67d0d execute
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20171119/work/gcc-8-20171119/gcc/tree-ssa-loop-ivcanon.c:1525
