[Bug tree-optimization/63800] New: ICE on valid code at -O3 on x86_64-linux-gnu
su at cs dot ucdavis.edu
gcc-bugzilla@gcc.gnu.org
Sun Nov 9 22:39:00 GMT 2014
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63800
Bug ID: 63800
Summary: ICE on valid code at -O3 on x86_64-linux-gnu
Product: gcc
Version: 5.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
The following code causes an ICE when compiled with the current gcc trunk at
-O3 on x86_64-linux-gnu in both 32-bit and 64-bit modes.
It is a regression from 4.9.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/5.0.0/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 5.0.0 20141108 (experimental) [trunk revision 217256] (GCC)
$ gcc-trunk -O2 -c small.c
$ gcc-4.9 -O3 -c small.c
$
$ gcc-trunk -O3 -c small.c
small.c: In function ‘fn1’:
small.c:4:1: internal compiler error: Segmentation fault
fn1 ()
^
0xa32bff crash_signal
../../gcc-trunk/gcc/toplev.c:358
0xbf5d90 update_dep_bb
../../gcc-trunk/gcc/tree-ssa-tail-merge.c:427
0xbf8a68 stmt_update_dep_bb
../../gcc-trunk/gcc/tree-ssa-tail-merge.c:457
0xbf8a68 same_succ_hash
../../gcc-trunk/gcc/tree-ssa-tail-merge.c:481
0xbf8a68 find_same_succ_bb
../../gcc-trunk/gcc/tree-ssa-tail-merge.c:742
0xbf91ac find_same_succ
../../gcc-trunk/gcc/tree-ssa-tail-merge.c:773
0xbf91ac init_worklist
../../gcc-trunk/gcc/tree-ssa-tail-merge.c:792
0xbf91ac tail_merge_optimize(unsigned int)
../../gcc-trunk/gcc/tree-ssa-tail-merge.c:1682
0xbb197f execute
../../gcc-trunk/gcc/tree-ssa-pre.c:4831
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, c, d[2];
int
fn1 ()
{
int f = 0;
d[1] = b = 1;
for (; b; b--)
{
for (c = 0; c < 2; c++)
{
d[b] & 1 & b;
if (d[0])
f = d[b] * a;
if (f)
return 0;
}
d[b] && (d[0] = 0);
}
return 0;
}
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