[Bug tree-optimization/119484] New: [14/15 Regression] v2: tail call vs IPA-VRP return value range with constant value

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119484

            Bug ID: 119484
           Summary: [14/15 Regression] v2: tail call vs IPA-VRP return
                    value range with constant value
           Product: gcc
           Version: 15.0
            Status: UNCONFIRMED
          Keywords: missed-optimization, tail-call
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
            Blocks: 119376
  Target Milestone: ---

This is similar to PR 118430 and I think it is one of reduced testcases from PR
119376 after all of the current fixes are applied.

Take:
```
void x();

[[gnu::noinline]]
static int f(int)
{
  x();
  return 0;
}
int g(int);
int h(int t)
{
  if (t == 1)
  [[clang::musttail]]
    return f(t);
  return 0;
}
```

This fails on the trunk because we decide to always return 0.


Referenced Bugs:

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119376
[Bug 119376] [15 Regression] musttail does not get dropped after inlining?