https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84057
Bug ID: 84057
Summary: [8 Regression] ICE: Segmentation fault (in
can_remove_branch_p)
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-alpha20180121 snapshot (r256935) ICEs when compiling the following
snippet w/ -O2 -fgraphite -funroll-loops -fno-tree-ccp -fno-tree-dce:
int ue;
void
fr (int ct)
{
int au = 0;
int *ra = &au;
while (au < 1)
{
au -= 0x7878788;
if (au != ct && ue != 0)
{
while (au < 1)
{
}
fc:
while (ct != 0)
{
}
}
}
for (au = 0; au < 2; ++au)
if (ct != 0)
goto fc;
}
% gcc-8.0.0-alpha20180121 -O2 -fgraphite -funroll-loops -fno-tree-ccp
-fno-tree-dce -c imaaek0k.c
during GIMPLE pass: cunroll
imaaek0k.c: In function 'fr':
imaaek0k.c:4:1: internal compiler error: Segmentation fault
fr (int ct)
^~
0xc969ef crash_signal
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180121/work/gcc-8-20180121/gcc/toplev.c:325
0x8829e3 can_remove_branch_p(edge_def const*)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180121/work/gcc-8-20180121/gcc/cfghooks.c:389
0x891683 remove_path(edge_def*, bool*, bitmap_head*)
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180121/work/gcc-8-20180121/gcc/cfgloopmanip.c:315
0xdd4b03 unloop_loops
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180121/work/gcc-8-20180121/gcc/tree-ssa-loop-ivcanon.c:668
0xdd7f01 unloop_loops
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180121/work/gcc-8-20180121/gcc/tree-ssa-loop-ivcanon.c:1450
0xdd7f01 tree_unroll_loops_completely
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180121/work/gcc-8-20180121/gcc/tree-ssa-loop-ivcanon.c:1450
0xdd83b4 execute
/var/tmp/portage/sys-devel/gcc-8.0.0_alpha20180121/work/gcc-8-20180121/gcc/tree-ssa-loop-ivcanon.c:1599
