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[Bug tree-optimization/66794] New: ICE at -O2 and -O3 on x86_64-linux-gnu
- 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: Tue, 07 Jul 2015 21:45:05 +0000
- Subject: [Bug tree-optimization/66794] New: ICE at -O2 and -O3 on x86_64-linux-gnu
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66794
Bug ID: 66794
Summary: ICE at -O2 and -O3 on x86_64-linux-gnu
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
-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 20150707 (experimental) [trunk revision 225501] (GCC)
$
$ gcc-trunk -Os -c small.c
small.c: In function âfn1â:
small.c:18:10: warning: function returns address of local variable
[-Wreturn-local-addr]
return *c;
^
small.c:12:7: note: declared here
int f, **g = &b;
^
$ gcc-5.1 -O2 -c small.c
small.c: In function âfn1â:
small.c:18:10: warning: function may return address of local variable
[-Wreturn-local-addr]
return *c;
^
small.c:12:7: note: declared here
int f, **g = &b;
^
$
$ gcc-trunk -O2 -c small.c
small.c: In function âfn1â:
small.c:18:10: warning: function may return address of local variable
[-Wreturn-local-addr]
return *c;
^
small.c:12:7: note: declared here
int f, **g = &b;
^
small.c:10:1: error: dominator of 4 status unknown
fn1 ()
^
small.c:10:1: internal compiler error: Segmentation fault
0xbb296f crash_signal
../../gcc-trunk/gcc/toplev.c:360
0x76ac43 verify_dominators(cdi_direction)
../../gcc-trunk/gcc/dominance.c:1059
0x76aed7 calculate_dominance_info(cdi_direction)
../../gcc-trunk/gcc/dominance.c:685
0xcd85e4 execute
../../gcc-trunk/gcc/tree-ssa-dse.c:404
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, e;
static int **c = &b;
struct
{
int f0;
} d;
int *
fn1 ()
{
int f, **g = &b;
e = a;
for (; a;)
for (; d.f0; d.f0++)
;
*g = &f;
return *c;
}