[Bug rtl-optimization/116544] [15] RISC-V: Miscompile at -O3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116544

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|target                      |rtl-optimization
             Status|UNCONFIRMED                 |NEW
      Known to fail|                            |12.3.0
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2024-08-30

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
A couple of things.
Looks like there is a missing optimization on the gimple level:
```
  if (c.2_7 != 0)
    goto <bb 3>; [50.00%]
  else
    goto <bb 4>; [50.00%]

  <bb 3> [local count: 238871722]:
  _61 = MEM[(long long int *)f.0_1 + 16B];
  _62 = (int) _61;
  e[2] = _62;
  _37 = MEM[(long long int *)f.0_1 + 40B];
  _30 = (int) _37;
  goto <bb 5>; [100.00%]

  <bb 4> [local count: 353842862]:
  _15 = MEM[(long long int *)f.0_1 + 16B];
  _14 = (int) _15;
  e[2] = _14;
  _5 = MEM[(long long int *)f.0_1 + 40B];
  _6 = (int) _5;

  <bb 5> [local count: 247801162]:
  # _25 = PHI <_30(3), _6(4)>

```

But then jump2 (which is after RA) goes wrong when it is commoning the 2 bb.