https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105786
Bug ID: 105786
Summary: ICE in compute_distributive_range, at
tree-data-ref.cc:593
Product: gcc
Version: 12.1.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: gcc at olupton dot com
Target Milestone: ---
The following example:
```
void sink(const char*);
static const char *a;
int main() {
const char *b = a;
for (int i = 0; i < 2; ++i)
while (*b++)
;
sink(b);
return 0;
}
```
produces an ICE at -O2 and above with 12.1:
```
during GIMPLE pass: pcom
<source>: In function 'int main()':
<source>:3:5: internal compiler error: in compute_distributive_range, at
tree-data-ref.cc:593
3 | int main() {
| ^~~~
```
this is reproducible on Compiler Explorer (https://godbolt.org/z/z1zrqrrEs) and
also using 12.1.1 installed via `dnf` in a `fedora:latest` Docker container.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102853 reports a similar error
message, but it says the issue is resolved so opening this new issue seems
justified.
Note that adding
```
void set_a(const char* x) {
a = x;
}
```
so that `a` can be non-null avoids the ICE.
