# R4-V0 — Ghidra ground-truth decompiles (patchmem.gpr, fetched live 2026-07-03)

Authoritative resolutions for the two pins the BN pseudo-C garbled. Fetched
via the Ghidra MCP while the V0 pin workflow ran; these OVERRIDE any textual
adjudication that disagrees.

## P3 — `heading_diff` 0x00528fb0: the TurnLeft mirror EXISTS

```c
float __cdecl heading_diff(float param_1, float param_2, ulong param_3)
{
  float fVar1;

  fVar1 = param_1 - param_2;
  if (ABS(param_1 - param_2) < F_EPSILON) {
    fVar1 = 0.0f;
  }
  if (fVar1 < -F_EPSILON) {
    fVar1 = fVar1 + 360.0f;            // ___real_43b40000
  }
  if ((F_EPSILON < fVar1) && (param_3 != 0x6500000d)) {
    fVar1 = 360.0f - fVar1;            // the mirror — NOT-TurnRight only
  }
  return fVar1;
}
```

Adjudication of the research contradiction:
- `r4-moveto-decomp.md` §5g ("turn-command arg UNUSED") is **WRONG** — the
  arg gates the mirror.
- `r4-ace-moveto.md`'s suspicion (an x87-garbled `360−diff` TurnLeft branch)
  is **CONFIRMED**: the mirror applies whenever the turn command is not
  TurnRight (0x6500000d), i.e. the TurnLeft direction measures the
  complementary angle. Port verbatim with the epsilon literal
  0.000199999995f (F_EPSILON).

## P2 — `MovementParameters::get_desired_heading` 0x0052aad0: ACE-shaped constants CONFIRMED

```c
float __thiscall MovementParameters::get_desired_heading(
    MovementParameters* this, ulong command, int movingAway)
{
  if ((command == 0x44000007) || (command == 0x45000005)) {   // Run/WalkForward
    if (movingAway == 0)
      return 0.0f;
  }
  else {
    if (command != 0x45000006)                                 // not WalkBackward
      return 0.0f;
    if (movingAway != 0)
      return 0.0f;
  }
  return 180.0f;                                               // ___real_43340000
}
```

Truth table: forward+towards → 0°; forward+away → 180°;
backward+towards → 180°; backward+away → 0°; any other command → 0°.