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PPU LLVM: Improve VMADDFP and VNMSUBFP #7798

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merged 1 commit into from Mar 19, 2020
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PPU LLVM: Improve VMADDFP and VNMSUBFP #7798

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41 changes: 37 additions & 4 deletions rpcs3/Emu/Cell/PPUTranslator.cpp
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Expand Up @@ -902,8 +902,24 @@ void PPUTranslator::VLOGEFP(ppu_opcode_t op)

void PPUTranslator::VMADDFP(ppu_opcode_t op)
{
const auto acb = GetVrs(VrType::vf, op.va, op.vc, op.vb);
SetVr(op.vd, m_ir->CreateFAdd(m_ir->CreateFMul(acb[0], acb[1]), acb[2]));
if (m_use_fma)
{
const auto acb = GetVrs(VrType::vf, op.va, op.vc, op.vb);
SetVr(op.vd, m_ir->CreateCall(get_intrinsic<f32[4]>(llvm::Intrinsic::fma), { acb[0], acb[1], acb[2] }));
return;
}

// Emulated FMA via double precision
auto a = get_vr<f32[4]>(op.va);
auto b = get_vr<f32[4]>(op.vb);
auto c = get_vr<f32[4]>(op.vc);

const auto xa = m_ir->CreateFPExt(a.value, get_type<f64[4]>());
const auto xb = m_ir->CreateFPExt(b.value, get_type<f64[4]>());
const auto xc = m_ir->CreateFPExt(c.value, get_type<f64[4]>());

const auto xr = m_ir->CreateCall(get_intrinsic<f64[4]>(llvm::Intrinsic::fmuladd), {xa, xc, xb});
SetVr(op.vd, m_ir->CreateFPTrunc(xr, get_type<f32[4]>()));
}

void PPUTranslator::VMAXFP(ppu_opcode_t op)
Expand Down Expand Up @@ -1182,8 +1198,25 @@ void PPUTranslator::VMULOUH(ppu_opcode_t op)

void PPUTranslator::VNMSUBFP(ppu_opcode_t op)
{
const auto acb = GetVrs(VrType::vf, op.va, op.vc, op.vb);
SetVr(op.vd, m_ir->CreateFNeg(m_ir->CreateFSub(m_ir->CreateFMul(acb[0], acb[1]), acb[2])));
// Differs from the emulated path with regards to negative zero
if (m_use_fma)
{
const auto acb = GetVrs(VrType::vf, op.va, op.vc, op.vb);
SetVr(op.vd, m_ir->CreateFNeg(m_ir->CreateCall(get_intrinsic<f32[4]>(llvm::Intrinsic::fma), { acb[0], acb[1], m_ir->CreateFNeg(acb[2]) })));
return;
}

// Emulated FMA via double precision
auto a = get_vr<f32[4]>(op.va);
auto b = get_vr<f32[4]>(op.vb);
auto c = get_vr<f32[4]>(op.vc);

const auto xa = m_ir->CreateFPExt(a.value, get_type<f64[4]>());
const auto xb = m_ir->CreateFPExt(b.value, get_type<f64[4]>());
const auto xc = m_ir->CreateFPExt(c.value, get_type<f64[4]>());

const auto xr = m_ir->CreateFNeg(m_ir->CreateFSub(m_ir->CreateFMul(xa, xc), xb));
SetVr(op.vd, m_ir->CreateFPTrunc(xr, get_type<f32[4]>()));
}

void PPUTranslator::VNOR(ppu_opcode_t op)
Expand Down