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[Bug c/80549] New: wrong code at -O2 and -O3 in both 32-bit and 64-bit modes on x86_64-linux-gnu (executable does not terminate)
- From: "chengniansun at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 27 Apr 2017 17:14:59 +0000
- Subject: [Bug c/80549] New: wrong code at -O2 and -O3 in both 32-bit and 64-bit modes on x86_64-linux-gnu (executable does not terminate)
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80549
Bug ID: 80549
Summary: wrong code at -O2 and -O3 in both 32-bit and 64-bit
modes on x86_64-linux-gnu (executable does not
terminate)
Product: gcc
Version: 7.0.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
Target Milestone: ---
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/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=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20170424 (experimental) [trunk revision 247088] (GCC)
$ gcc-trunk -O2 small.c ; timeout -s 9 10 ./a.out
Killed
$ cat small.c
char a, b;
int c;
short d;
void fn1(int p1) {
short e = 4;
int f;
d = 0;
for (; d <= 0; d++)
e = 0;
if (e)
goto L1;
L2:
if (p1) {
a = 9;
for (; a; ++a) {
f = 5;
for (; f != 32; ++f)
c = 8;
L1:
if (b)
goto L2;
}
}
}
int main() {
fn1(1);
return 0;
}
$
$