https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81090
Bug ID: 81090
Summary: [8 Regression] [graphite] ICE in loop_preheader_edge
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-alpha20170611 snapshot ICEs when compiling the following snippet w/
-O2 (-O3, -Ofast) -floop-nest-optimize:
int x3, za;
int hg[1];
void
yw (int dq)
{
const int r7 = 2;
while (dq < 1)
{
for (x3 = 0; x3 < r7; ++x3)
for (za = 0; za < r7; ++za)
hg[1] = 0;
++dq;
}
x3 = 0;
while (x3 < r7)
{
++x3;
if (x3 == 0)
break;
}
}
% gcc-8.0.0-alpha20170611 -O2 -floop-nest-optimize -c yrfe1sre.c
during GIMPLE pass: graphite
yrfe1sre.c: In function 'yw':
yrfe1sre.c:5:1: internal compiler error: Segmentation fault
yw (int dq)
^~
(gdb) where
#0 0x000000000087c4e8 in loop_preheader_edge(loop const*) ()
#1 0x0000000000d44621 in analyze_scalar_evolution(loop*, tree_node*) ()
#2 0x0000000000d47d7b in analyze_scalar_evolution_in_loop(loop*, loop*,
tree_node*, bool*) ()
#3 0x0000000000d47ed2 in simple_iv_with_niters(loop*, loop*, tree_node*,
affine_iv*, tree_node**, bool) ()
#4 0x0000000000bad67f in is_comparison_with_loop_invariant_p(gcond*, loop*,
tree_node**, tree_code*, tree_node**, tree_node**) ()
#5 0x0000000000bb4139 in predict_loops() ()
#6 0x0000000000bb6023 in tree_estimate_probability(bool) ()
#7 0x0000000001375172 in graphite_transform_loops() ()
#8 0x0000000001375701 in (anonymous
namespace)::pass_graphite_transforms::execute(function*) ()
#9 0x0000000000b9b629 in execute_one_pass(opt_pass*) ()
#10 0x0000000000b9be55 in execute_pass_list_1(opt_pass*) ()
#11 0x0000000000b9be67 in execute_pass_list_1(opt_pass*) ()
#12 0x0000000000b9be67 in execute_pass_list_1(opt_pass*) ()
#13 0x0000000000b9be67 in execute_pass_list_1(opt_pass*) ()
#14 0x0000000000b9be99 in execute_pass_list(function*, opt_pass*) ()
#15 0x00000000008a4720 in cgraph_node::expand() ()
#16 0x00000000008a5bd1 in symbol_table::compile() [clone .part.51] ()
#17 0x00000000008a7dc7 in symbol_table::finalize_compilation_unit() ()
#18 0x0000000000c71655 in compile_file() ()
#19 0x000000000072f69a in toplev::main(int, char**) ()
#20 0x00000000007315bb in main ()
