[Bug tree-optimization/71417] New: wrong code (SIGFPE) at -O3 on x86_64-linux-gnu
su at cs dot ucdavis.edu
gcc-bugzilla@gcc.gnu.org
Sun Jun 5 04:34:00 GMT 2016
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71417
Bug ID: 71417
Summary: wrong code (SIGFPE) at -O3 on x86_64-linux-gnu
Product: gcc
Version: 7.0
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: ---
The current gcc trunk miscompiles the following code on x86_64-linux-gnu at -O3
in both 32-bit and 64-bit modes.
This is a regression from 6.1.x.
$ 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/7.0.0/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 7.0.0 20160604 (experimental) [trunk revision 237091] (GCC)
$
$ gcc-trunk -O2 small.c; ./a.out
$ gcc-6.1 -O3 small.c; ./a.out
$
$ gcc-trunk -O3 small.c
$ ./a.out
Floating point exception (core dumped)
$
---------------------------------------
char a = -97;
int b, c, d, e;
int
main ()
{
int g = d, h = 0, i = 1;
for (; h < 3; h++)
{
if (g > -1)
{
int j;
g = j = 0;
for (; j < 5; j++)
L1:
if (!i)
goto L1;
a = e;
}
else
i = 0;
}
b = c / ~(a | 114);
return 0;
}
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