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CPU: Fix overflow bit calculation in SUBFO instruction

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Since rD can overlap with rA or rB the result needs to be stored in a temporary
This commit is contained in:
Exzap 2024-07-26 05:13:45 +02:00
parent 47f1dcf996
commit 5328e9eb10
1 changed files with 4 additions and 3 deletions
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7
src/Cafe/HW/Espresso/Interpreter/PPCInterpreterALU.hpp
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@ -212,11 +212,12 @@ static void PPCInterpreter_SUBF(PPCInterpreter_t* hCPU, uint32 opcode)
static void PPCInterpreter_SUBFO(PPCInterpreter_t* hCPU, uint32 opcode)
{
// untested (Don't Starve Giant Edition uses this)
// Seen in Don't Starve Giant Edition and Teslagrad
// also used by DS Virtual Console (Super Mario 64 DS)
PPC_OPC_TEMPL3_XO();
hCPU->gpr[rD] = ~hCPU->gpr[rA] + hCPU->gpr[rB] + 1;
PPCInterpreter_setXerOV(hCPU, checkAdditionOverflow(~hCPU->gpr[rA], hCPU->gpr[rB], hCPU->gpr[rD]));
uint32 result = ~hCPU->gpr[rA] + hCPU->gpr[rB] + 1;
PPCInterpreter_setXerOV(hCPU, checkAdditionOverflow(~hCPU->gpr[rA], hCPU->gpr[rB], result));
hCPU->gpr[rD] = result;
if (opHasRC())
ppc_update_cr0(hCPU, hCPU->gpr[rD]);
PPCInterpreter_nextInstruction(hCPU);