https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118895
Bug ID: 118895
Summary: ICE: during GIMPLE pass: pre
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: yunboni at smail dot nju.edu.cn
Target Milestone: ---
This code crashes at -O2:
```c
unsigned long a;
void fn1() {
unsigned long e = a;
int c = e;
int d = c < 100 ? c : 0;
if (d + (int)e & 608)
while (e & 608)
e <<= 1;
}
```
Compiler Explorer: https://godbolt.org/z/qvvhh5M5j
Crash: during GIMPLE pass: pre
Backtrace:
simple.c: In function ‘b’:
simple.c:2:6: internal compiler error: Segmentation fault
2 | void b() {
| ^
0x260a386 internal_error(char const*, ...)
../../gcc/diagnostic-global-context.cc:517
0x1143f13 crash_signal
../../gcc/toplev.cc:322
0x1345424 bmp_iter_set_init(bitmap_iterator*, bitmap_head const*, unsigned int,
unsigned int*)
../../gcc/bitmap.h:542
0x1345424 find_or_generate_expression
../../gcc/tree-ssa-pre.cc:2776
0x1344a3a find_or_generate_expression
../../gcc/tree-ssa-pre.cc:2748
0x1344a3a create_expression_by_pieces
../../gcc/tree-ssa-pre.cc:2924
0x1349943 insert_into_preds_of_block
../../gcc/tree-ssa-pre.cc:3132
0x134c360 do_pre_regular_insertion
../../gcc/tree-ssa-pre.cc:3398
0x134c360 insert
../../gcc/tree-ssa-pre.cc:3833
0x134c360 execute
../../gcc/tree-ssa-pre.cc:4470
