https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83545
Bug ID: 83545
Summary: ICE at -O3 on x86_64-linux-gnu: in
smallest_mode_for_size, at stor-layout.c:355
Product: gcc
Version: unknown
Status: WAITING
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: su at cs dot ucdavis.edu
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Status: WAITING
Last reconfirmed: 2018-11-23
Ever confirmed: 1
$ gcctk -v
Using built-in specs.
COLLECT_GCC=gcctk
COLLECT_LTO_WRAPPER=/home/su/software/tmp/gcc/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/8.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/home/su/software/tmp/gcc/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 8.0.0 20171222 (experimental) [trunk revision 255967] (GCC)
$
$ gcctk -O2 -c small.c
$ gcc-7.2.0 -O3 -c small.c
$
$ gcctk -O3 -c small.c
during RTL pass: dse1
small.c: In function ‘f’:
small.c:8:1: internal compiler error: in smallest_mode_for_size, at
stor-layout.c:355
}
^
0xc760eb smallest_mode_for_size(poly_int<1u, unsigned long>, mode_class)
../../gcc-source-trunk/gcc/stor-layout.c:355
0x13ed0dd smallest_int_mode_for_size(poly_int<1u, unsigned long>)
../../gcc-source-trunk/gcc/machmode.h:737
0x13ed0dd find_shift_sequence
../../gcc-source-trunk/gcc/dse.c:1696
0x13ed0dd get_stored_val
../../gcc-source-trunk/gcc/dse.c:1842
0x13ef9af record_store
../../gcc-source-trunk/gcc/dse.c:1552
0x13f07f2 scan_insn
../../gcc-source-trunk/gcc/dse.c:2540
0x13f19e2 dse_step1
../../gcc-source-trunk/gcc/dse.c:2652
0x13f19e2 rest_of_handle_dse
../../gcc-source-trunk/gcc/dse.c:3569
0x13f19e2 execute
../../gcc-source-trunk/gcc/dse.c:3667
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
$
-------------------------------------------------
int a, b, c[1][25];
void f ()
{
for (a = 0; a < 5; a++)
for (b = 0; b < 5; b++)
c[3970000000000000000][a * 5 + b] = 1;
}
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Can't reproduce, can you please recheck?
