https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71751
Bug ID: 71751
Summary: [7 Regression] Segmentation fault in ssa_default_def
Product: gcc
Version: 7.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
Target Milestone: ---
The testcase below ICEs for me on aarch64-none-linux-gnu:
int a, c;
int b[1];
void
fn1 ()
{
for (;;)
for (; a; a--)
{
short d = c = 0;
for (; c <= 1; c++)
b[c] = ++d;
if (d)
continue;
return;
}
}
with -Ofast -floop-interchange. This is likely a graphite bug.
The backtrace is:
report.c: In function ‘fn1’:
report.c:4:1: internal compiler error: Segmentation fault
fn1 ()
^~~
0xb0ce1f crash_signal
$SRC/gcc/toplev.c:335
0xb5ed57 ssa_default_def(function*, tree_node*)
$SRC/gcc/tree-dfa.c:305
0xb614e0 get_or_create_ssa_default_def(function*, tree_node*)
$SRC/gcc/tree-dfa.c:357
0xb9d34e rewrite_update_phi_arguments
$SRC/gcc/tree-into-ssa.c:2025
0xb9d34e rewrite_update_dom_walker::before_dom_children(basic_block_def*)
$SRC/gcc/tree-into-ssa.c:2145
0x1056ee7 dom_walker::walk(basic_block_def*)
$SRC/gcc/domwalk.c:265
0xb96b99 rewrite_blocks
$SRC/gcc/tree-into-ssa.c:2202
0xb9ed24 update_ssa(unsigned int)
$SRC/gcc/tree-into-ssa.c:3364
0x1083307 graphite_regenerate_ast_isl(scop*)
$SRC/gcc/graphite-isl-ast-to-gimple.c:3202
0x107a12e graphite_transform_loops()
$SRC/gcc/graphite.c:329
0x107a6c0 graphite_transforms
$SRC/gcc/graphite.c:356
0x107a6c0 execute
$SRC/gcc/graphite.c:433
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.
