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[Bug tree-optimization/82217] New: ICE on valid code at -O1 and above: in visit_phi, at tree-ssa-sccvn.c:3908
- From: "su at cs dot ucdavis.edu" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Fri, 15 Sep 2017 05:52:50 +0000
- Subject: [Bug tree-optimization/82217] New: ICE on valid code at -O1 and above: in visit_phi, at tree-ssa-sccvn.c:3908
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82217
Bug ID: 82217
Summary: ICE on valid code at -O1 and above: in visit_phi, at
tree-ssa-sccvn.c:3908
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
Target Milestone: ---
This should be a very recent regression.
$ gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20170915 (experimental) [trunk revision 252779] (GCC)
$
$ gcctk -O0 small.c
$ gcc-7.2.0 -O1 small.c
$
$ gcctk -O1 small.c
during GIMPLE pass: fre
small.c: In function ‘fn1’:
small.c:29:1: internal compiler error: in visit_phi, at tree-ssa-sccvn.c:3908
}
^
0xe4d420 visit_phi
../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:3908
0xe4d420 visit_use
../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:3982
0xe4dfd3 process_scc
../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4330
0xe4dfd3 extract_and_process_scc_for_name
../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4401
0xe4dfd3 DFS
../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4451
0xe4ee33 sccvn_dom_walker::before_dom_children(basic_block_def*)
../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:4900
0x1379a2a dom_walker::walk(basic_block_def*)
../../gcc-source-trunk/gcc/domwalk.c:291
0xe4fe25 run_scc_vn(vn_lookup_kind)
../../gcc-source-trunk/gcc/tree-ssa-sccvn.c:5016
0xe1ae62 execute
../../gcc-source-trunk/gcc/tree-ssa-pre.c:5157
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$
----------------------------------
int a, b, c;
void fn1 ()
{
while (1)
{
if (c)
goto L2;
break;
}
if (c)
{
L1:{
int g[1];
if (b)
goto L1;
goto L1;
L2:
for (a = 0; a;)
goto L1;
}
}
}
int main ()
{
fn1 ();
return 0;
}