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[Bug tree-optimization/71477] New: gcc ICE at -O3 on valid code on x86_64-linux-gnu with âseg faultâ
- From: "helloqirun at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 09 Jun 2016 16:22:45 +0000
- Subject: [Bug tree-optimization/71477] New: gcc ICE at -O3 on valid code on x86_64-linux-gnu with âseg faultâ
- Auto-submitted: auto-generated
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71477
Bug ID: 71477
Summary: gcc ICE at -O3 on valid code on x86_64-linux-gnu with
âseg faultâ
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: helloqirun at gmail dot com
Target Milestone: ---
The following valid code causes an ICE when compiled with the current gcc trunk
at only -O3 on x86_64-linux-gnu in 64-bit mode. 32-bit mode works fine.
It appears to be a 7 regression.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/home/absozero/trunk/root-gcc/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/home/absozero/trunk/root-gcc
--enable-languages=c,c++ --disable-werror --enable-multilib
Thread model: posix
gcc version 7.0.0 20160608 (experimental) [trunk revision 237212] (GCC)
$ gcc-trunk -O3 abc.c
abc.c: In function âfn1â:
abc.c:3:6: internal compiler error: Segmentation fault
void fn1() {
^~~
0xb635cf crash_signal
../../gcc/gcc/toplev.c:335
0xe5a184 top_bit_of
../../gcc/gcc/wide-int.cc:424
0xe5a184 wi::add_large(long*, long const*, unsigned int, long const*, unsigned
int, unsigned int, signop, bool*)
../../gcc/gcc/wide-int.cc:1143
0xdad921 wi::binary_traits<generic_wide_int<fixed_wide_int_storage<192> >, int,
wi::int_traits<generic_wide_int<fixed_wide_int_storage<192> >
>::precision_type, wi::int_traits<int>::precision_type>::result_type
wi::add<generic_wide_int<fixed_wide_int_storage<192> >,
int>(generic_wide_int<fixed_wide_int_storage<192> > const&, int const&)
../../gcc/gcc/wide-int.h:2330
0xdad921 wi::binary_traits<generic_wide_int<fixed_wide_int_storage<192> >, int,
(wi::precision_type)2, wi::int_traits<int>::precision_type>::result_type
generic_wide_int<fixed_wide_int_storage<192> >::operator+<int>(int const&)
const
../../gcc/gcc/wide-int.h:711
0xdad921 vect_transform_loop(_loop_vec_info*)
../../gcc/gcc/tree-vect-loop.c:6935
0xdc9bc5 vectorize_loops()
../../gcc/gcc/tree-vectorizer.c:554
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.
$ cat abc.c
#define N 6
int a;
void fn1() {
int k = 0;
for (; k < N;)
for (a = 0; a < N; k++)
a = k + N;
}