https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70263
Bug ID: 70263
Summary: ICE at -O1 and above in both 32-bit and 64-bit modes
on x86_64-linux-gnu (segmentation fault)
Product: gcc
Version: 6.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: chengniansun at gmail dot com
Target Milestone: ---
The following code crashes the trunk of gcc at -O1 and above in both 32-bit and
64-bit modes on x86_64-linux-gnu.
This bug also affects gcc-4.9 and later versions.
$: 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/6.0.0/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 6.0.0 20160316 (experimental) [trunk revision 234258] (GCC)
$:
$: gcc-trunk -O1 small.c
small.c: In function ‘fn1’:
small.c:10:1: internal compiler error: Segmentation fault
}
^
0xb520ff crash_signal
../../gcc-source-trunk/gcc/toplev.c:335
0x996b1d memref_used_between_p
../../gcc-source-trunk/gcc/ira.c:3237
0x996b1d update_equiv_regs
../../gcc-source-trunk/gcc/ira.c:3654
0x998293 ira
../../gcc-source-trunk/gcc/ira.c:5219
0x998293 execute
../../gcc-source-trunk/gcc/ira.c:5549
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.
$:
$: cat small.c
int a[91];
int b, c;
void fn1() {
int n, m;
do {
a[c--];
a[--c] = m;
a[--m] = b;
} while (n);
}
int main() {}
$:
