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[Bug tree-optimization/66949] New: ICE at -O2 and -O3 on x86_64-linux-gnu in tree_ssa_phiopt_worker, at tree-ssa-phiopt.c:335
- 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: Mon, 20 Jul 2015 19:31:18 +0000
- Subject: [Bug tree-optimization/66949] New: ICE at -O2 and -O3 on x86_64-linux-gnu in tree_ssa_phiopt_worker, at tree-ssa-phiopt.c:335
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66949
Bug ID: 66949
Summary: ICE at -O2 and -O3 on x86_64-linux-gnu in
tree_ssa_phiopt_worker, at tree-ssa-phiopt.c:335
Product: gcc
Version: 6.0
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 following code causes an ICE when compiled with the current gcc trunk at
-O2 and -O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It is a regression from 5.1.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-unknown-linux-gnu/6.0.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../gcc-trunk/configure --prefix=/usr/local/gcc-trunk
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 6.0.0 20150719 (experimental) [trunk revision 225987] (GCC)
$
$ gcc-trunk -Os small.c; ./a.out
$ gcc-5.1 -O2 small.c; ./a.out
$
$ gcc-trunk -O2 small.c
small.c: In function âfn2â:
small.c:10:1: internal compiler error: in tree_ssa_phiopt_worker, at
tree-ssa-phiopt.c:335
fn2 ()
^
0xcf3dfd tree_ssa_phiopt_worker
../../gcc-trunk/gcc/tree-ssa-phiopt.c:335
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.
$
---------------------------------------------
int a, *b = &a, c;
unsigned short
fn1 (unsigned short p1, unsigned int p2)
{
return p2 > 1 || p1 >> p2 ? p1 : p1 << p2;
}
void
fn2 ()
{
int *d = &a;
for (a = 0; a < -1; a = 1)
;
if (a < 0)
c = 0;
*b = fn1 (*d || c, *d);
}
int
main ()
{
fn2 ();
return 0;
}