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[Bug tree-optimization/59386] New: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu in 64-bit mode
- 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: Wed, 04 Dec 2013 17:51:43 +0000
- Subject: [Bug tree-optimization/59386] New: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu in 64-bit mode
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59386
Bug ID: 59386
Summary: ICE on valid code at -O2 and -O3 on x86_64-linux-gnu
in 64-bit mode
Product: gcc
Version: 4.9.0
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
-O2 and -O3 on x86_64-linux-gnu in 64-bit mode (but not in 32-bit mode).
It is a regression from 4.8.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/4.9.0/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 4.9.0 20131204 (experimental) [trunk revision 205660] (GCC)
$
$ gcc-trunk -m64 -Os -c small.c
$ gcc-4.8 -m64 -O2 -c small.c
$ gcc-trunk -m32 -O2 -c small.c
$
$ gcc-trunk -m64 -O2 -c small.c
small.c: In function âfn2â:
small.c:31:1: error: incorrect sharing of tree nodes
}
^
a.f2
# .MEM_11 = VDEF <.MEM_10>
a.f2 = D.1782;
small.c:31:1: internal compiler error: verify_gimple failed
0x9d3821 verify_gimple_in_cfg(function*)
../../gcc-trunk/gcc/tree-cfg.c:4848
0x8fa874 execute_function_todo
../../gcc-trunk/gcc/passes.c:1843
0x8fb273 execute_todo
../../gcc-trunk/gcc/passes.c:1877
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.
$
---------------------------
struct S0
{
int f0;
};
struct S1
{
int f1;
struct S0 f2;
} c;
int b;
struct S0
fn1 ()
{
struct S1 d;
if (b)
for (; c.f1;)
;
else
return d.f2;
}
struct S0
fn2 ()
{
struct S1 a;
a.f2 = fn1 ();
return a.f2;
}