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ppu: improve fnmsub instruction

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scribam 2018-06-26 22:11:08 +02:00 committed by Ivan
parent 1c9769670c
commit f1e6532ec0
2 changed files with 2 additions and 2 deletions
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2
rpcs3/Emu/Cell/PPUInterpreter.cpp
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@ -4813,7 +4813,7 @@ bool ppu_interpreter::FMADD(ppu_thread& ppu, ppu_opcode_t op)
bool ppu_interpreter::FNMSUB(ppu_thread& ppu, ppu_opcode_t op)
{
ppu.fpr[op.frd] = -(ppu.fpr[op.fra] * ppu.fpr[op.frc]) + ppu.fpr[op.frb];
ppu.fpr[op.frd] = -(ppu.fpr[op.fra] * ppu.fpr[op.frc] - ppu.fpr[op.frb]);
if (UNLIKELY(op.rc)) fmt::throw_exception("%s: op.rc", __func__); //ppu_cr_set(ppu, 1, ppu.fpscr.fg, ppu.fpscr.fl, ppu.fpscr.fe, ppu.fpscr.fu);
return true;
}

2
rpcs3/Emu/Cell/PPUTranslator.cpp
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@ -4189,7 +4189,7 @@ void PPUTranslator::FNMSUB(ppu_opcode_t op)
const auto a = GetFpr(op.fra);
const auto b = GetFpr(op.frb);
const auto c = GetFpr(op.frc);
const auto result = m_ir->CreateFSub(b, m_ir->CreateFMul(a, c));
const auto result = m_ir->CreateFNeg(m_ir->CreateFSub(m_ir->CreateFMul(a, c), b));
SetFpr(op.frd, result);
//SetFPSCR_FR(Call(GetType<bool>(), m_pure_attr, "__fmadd_get_fr", a, b, c)); // TODO ???