[Bug c/122203] New: FMV gives wrong result with C FE?

[sjames at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122203

            Bug ID: 122203
           Summary: FMV gives wrong result with C FE?
           Product: gcc
           Version: 16.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sjames at gcc dot gnu.org
  Target Milestone: ---

With -mavx2, this testcase works for me with C++ and aborts with C:
```
__attribute__ ((target ("default")))
int foo ()
{
  return 0;
}

__attribute__ ((target ("avx2")))
int foo ()
{
  return 1;
}

int main ()
{
  #ifdef __AVX2__
  if (foo () != 1)
    __builtin_abort();
  #else
  if (foo () != 0)
    __builtin_abort();
  #endif
  return 0;
}
```