https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110251
Bug ID: 110251
Summary: Hang at -O3 on x86_64-linux-gnu
Product: gcc
Version: 14.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: shaohua.li at inf dot ethz.ch
Target Milestone: ---
Since GCC-13, gcc -O3 would hang on the following testcase.
Compiler Explorer: https://godbolt.org/z/z6zTv889c
$ cat a.c
int a, b;
char c;
int d(int e) {
if (e >= 'a')
return e;
}
int f(unsigned short e) {
for (; e; a++)
e &= e - 1;
}
void g() {
for (; c < 1;)
;
for (; f(c - 1); b = d(c))
;
}
$
$ gcc-tk -O3 a.c
Killed - processing time exceeded
$
$ gcc-tk -v
Using built-in specs.
COLLECT_GCC=gcc-tk
COLLECT_LTO_WRAPPER=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-bf470895905e9152424076d1630a9d2c60de023b/libexec/gcc/x86_64-pc-linux-gnu/14.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../configure --disable-multilib --disable-bootstrap
--enable-languages=c,c++
--prefix=/zdata/shaoli/compilers/ccbuilder-compilers/gcc-bf470895905e9152424076d1630a9d2c60de023b
Thread model: posix
Supported LTO compression algorithms: zlib
gcc version 14.0.0 20230612 (experimental) (GCC)
$
