https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95108
Bug ID: 95108
Summary: [10/11 Regression] ICE in tree_fits_uhwi_p, at
tree.c:7292
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: gs...@t-online.de
Target Milestone: ---
Changed between 20190811 and 20190818, with -fno-tree-ccp :
(test case derived from pr88588.c)
$ cat z1.c
int *v;
#pragma omp declare simd
void
foo (int x)
{
int *a = &x + 1;
for (;;)
{
*v = *a;
a = v;
}
}
$ gcc-10-20190811 -c z1.c -O2 -fopenmp -fno-tree-ccp
$
$ gcc-11-20200510 -c z1.c -O2 -fopenmp -fno-tree-ccp
during GIMPLE pass: alias
z1.c: In function 'foo.simdclone.0':
z1.c:5:1: internal compiler error: Segmentation fault
5 | foo (int x)
| ^~~
0xb0ed8f crash_signal
../../gcc/toplev.c:328
0xd62e47 tree_fits_uhwi_p(tree_node const*)
../../gcc/tree.c:7292
0xcb74ad create_variable_info_for_1
../../gcc/tree-ssa-structalias.c:6068
0xcb7c43 create_variable_info_for
../../gcc/tree-ssa-structalias.c:6251
0xcb7c43 get_vi_for_tree
../../gcc/tree-ssa-structalias.c:2939
0xcb839f get_constraint_for_ssa_var
../../gcc/tree-ssa-structalias.c:3031
0xcb8902 get_constraint_for_1
../../gcc/tree-ssa-structalias.c:3611
0xcb97c4 get_constraint_for_ptr_offset
../../gcc/tree-ssa-structalias.c:3166
0xcb8939 get_constraint_for_1
../../gcc/tree-ssa-structalias.c:3544
0xcb9172 get_constraint_for_address_of
../../gcc/tree-ssa-structalias.c:3462
0xcb8b6b get_constraint_for_1
../../gcc/tree-ssa-structalias.c:3530
0xcbce95 find_func_aliases
../../gcc/tree-ssa-structalias.c:5017
0xcbdafe compute_points_to_sets
../../gcc/tree-ssa-structalias.c:7380
0xcbdafe compute_may_aliases()
../../gcc/tree-ssa-structalias.c:7861
0xa4524e execute_function_todo
../../gcc/passes.c:1957
0xa46192 execute_todo
../../gcc/passes.c:2039
A test version (configured with --enable-checking=yes)
does not need that extra option :
$ gcc-11-20200510-chk -c z1.c -O2 -fopenmp
z1.c: In function 'foo.simdclone.7':
z1.c:14:1: error: definition in block 6 follows the use
14 | }
| ^
for SSA_NAME: _8 in statement:
_9 = &MEM <int> [(void *)_8 + 4B];
during IPA pass: simdclone
z1.c:14:1: internal compiler error: verify_ssa failed
0xf3faab verify_ssa(bool, bool)
../../gcc/tree-ssa.c:1208
0xbe8827 execute_function_todo
../../gcc/passes.c:1992
0xbe952d do_per_function
../../gcc/passes.c:1647
0xbe9592 execute_todo
../../gcc/passes.c:2039
