https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78162
Bug ID: 78162
Summary: ICE on invalid code at -Os and above on
x86_64-linux-gnu: Segmentation fault
Product: gcc
Version: unknown
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: ---
This is a regression from 6.2.x.
$ gcc-trunk -v
Using built-in specs.
COLLECT_GCC=gcc-trunk
COLLECT_LTO_WRAPPER=/usr/local/gcc-trunk/libexec/gcc/x86_64-pc-linux-gnu/7.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc-source-trunk/configure --enable-languages=c,c++,lto
--prefix=/usr/local/gcc-trunk --disable-bootstrap
Thread model: posix
gcc version 7.0.0 20161030 (experimental) [trunk revision 241684] (GCC)
$
$ gcc-trunk -O1 -c small.c
$ gcc-6.2 -Os -c small.c
$
$ gcc-trunk -Os -c small.c
small.c: In function ‘fn1’:
small.c:3:6: internal compiler error: Segmentation fault
void fn1()
^~~
0xbedacf crash_signal
../../gcc-source-trunk/gcc/toplev.c:338
0x12dfed1 vec<gimple*, va_heap, vl_embed>::operator[](unsigned int)
../../gcc-source-trunk/gcc/vec.h:732
0x12dfed1 vec<gimple*, va_heap, vl_ptr>::operator[](unsigned int)
../../gcc-source-trunk/gcc/vec.h:1216
0x12dfed1 get_alias_type_for_stmts
../../gcc-source-trunk/gcc/gimple-ssa-store-merging.c:941
0x12dfed1 output_merged_store
../../gcc-source-trunk/gcc/gimple-ssa-store-merging.c:1129
0x12dfed1 output_merged_stores
../../gcc-source-trunk/gcc/gimple-ssa-store-merging.c:1213
0x12dfed1 terminate_and_process_chain
../../gcc-source-trunk/gcc/gimple-ssa-store-merging.c:1251
0x12dfed1 terminate_and_release_chain
../../gcc-source-trunk/gcc/gimple-ssa-store-merging.c:833
0x12e0d38 terminate_all_aliasing_chains
../../gcc-source-trunk/gcc/gimple-ssa-store-merging.c:811
0x12e120e execute
../../gcc-source-trunk/gcc/gimple-ssa-store-merging.c:1456
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[1][2];
void fn1()
{
for (a = 0; a < 2; a++)
b[-1][a] = 0;
}
