[Bug tree-optimization/118466] New: Not removing bounds checking enough to vectorize

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118466

            Bug ID: 118466
           Summary: Not removing bounds checking enough to vectorize
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: enhancement
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
            Blocks: 85316
  Target Milestone: ---

Take:
```
typedef __SIZE_TYPE__ size_t;
void f(size_t t, int *v1, int *s2) {
  for (size_t i = 0; i != t; i++) {
    if (!(i < t)) __builtin_abort();
    v1[i] = s2[i];
  }
}
```

VRP2 is able to remove the bounds check that is inside the loop but that is too
late to vectorize the loop.

Note I found this while looking into PR 118464 which is an issue with the early
out vectorizer.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85316
[Bug 85316] [meta-bug] VRP range propagation missed cases