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[Bug tree-optimization/57592] New: ICE in tree_unroll_loops_completely at -O3
- From: "dhazeghi at yahoo dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 12 Jun 2013 00:50:06 +0000
- Subject: [Bug tree-optimization/57592] New: ICE in tree_unroll_loops_completely at -O3
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57592
Bug ID: 57592
Summary: ICE in tree_unroll_loops_completely at -O3
Product: gcc
Version: 4.9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: dhazeghi at yahoo dot com
With current gcc trunk on x86_64-linux, the following code causes an ICE when
compiled at -O3. This is a regression from 4.8.x.
$ gcc-trunk -v
gcc version 4.9.0 20130611 (experimental) [trunk revision 199947] (GCC)
$ gcc-trunk -m32 -O2 -c ice.c
$ gcc-4.8 -m32 -O3 -c ice.c
$ gcc-trunk -m32 -O3 -c ice.c
ice.c: In function âfâ:
ice.c:4:1: internal compiler error: Segmentation fault
f ()
^
0x7d419f crash_signal
../../gcc-trunk/gcc/toplev.c:333
0x7fc29b ssa_default_def(function*, tree_node*)
../../gcc-trunk/gcc/tree-dfa.c:314
0x7fc560 get_or_create_ssa_default_def(function*, tree_node*)
../../gcc-trunk/gcc/tree-dfa.c:362
0x81585a get_reaching_def
../../gcc-trunk/gcc/tree-into-ssa.c:1184
0x81b9db maybe_replace_use
../../gcc-trunk/gcc/tree-into-ssa.c:1784
0x81b9db rewrite_update_stmt
../../gcc-trunk/gcc/tree-into-ssa.c:1967
0x81b9db rewrite_update_enter_block
../../gcc-trunk/gcc/tree-into-ssa.c:2136
0xb3561a walk_dominator_tree(dom_walk_data*, basic_block_def*)
../../gcc-trunk/gcc/domwalk.c:210
0x814563 rewrite_blocks
../../gcc-trunk/gcc/tree-into-ssa.c:2216
0x81ac8e update_ssa(unsigned int)
../../gcc-trunk/gcc/tree-into-ssa.c:3303
0xb99fe4 tree_unroll_loops_completely(bool, bool)
../../gcc-trunk/gcc/tree-ssa-loop-ivcanon.c:1207
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;
void
f ()
{
int d, e;
a = 0;
for (; a <= 1; a++)
{
e = 4;
for (; e; e--)
{
d |= c < b++;
c = 0;
}
}
g (d);
}