diff options
Diffstat (limited to '')
-rw-r--r-- | src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_fused_multiply_add.cpp | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_fused_multiply_add.cpp b/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_fused_multiply_add.cpp new file mode 100644 index 000000000..fa2a7807b --- /dev/null +++ b/src/shader_recompiler/frontend/maxwell/translate/impl/floating_point_fused_multiply_add.cpp @@ -0,0 +1,94 @@ +// Copyright 2021 yuzu Emulator Project +// Licensed under GPLv2 or any later version +// Refer to the license.txt file included. + +#include "common/common_types.h" +#include "shader_recompiler/exception.h" +#include "shader_recompiler/frontend/maxwell/translate/impl/common_encoding.h" +#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h" + +namespace Shader::Maxwell { +namespace { +void FFMA(TranslatorVisitor& v, u64 insn, const IR::F32& src_b, const IR::F32& src_c, bool neg_a, + bool neg_b, bool neg_c, bool sat, bool cc, FmzMode fmz_mode, FpRounding fp_rounding) { + union { + u64 raw; + BitField<0, 8, IR::Reg> dest_reg; + BitField<8, 8, IR::Reg> src_a; + } const ffma{insn}; + + if (cc) { + throw NotImplementedException("FFMA CC"); + } + const IR::F32 op_a{v.ir.FPAbsNeg(v.F(ffma.src_a), false, neg_a)}; + const IR::F32 op_b{v.ir.FPAbsNeg(src_b, false, neg_b)}; + const IR::F32 op_c{v.ir.FPAbsNeg(src_c, false, neg_c)}; + const IR::FpControl fp_control{ + .no_contraction = true, + .rounding = CastFpRounding(fp_rounding), + .fmz_mode = CastFmzMode(fmz_mode), + }; + IR::F32 value{v.ir.FPFma(op_a, op_b, op_c, fp_control)}; + if (fmz_mode == FmzMode::FMZ && !sat) { + // Do not implement FMZ if SAT is enabled, as it does the logic for us. + // On D3D9 mode, anything * 0 is zero, even NAN and infinity + const IR::F32 zero{v.ir.Imm32(0.0f)}; + const IR::U1 zero_a{v.ir.FPEqual(op_a, zero)}; + const IR::U1 zero_b{v.ir.FPEqual(op_b, zero)}; + const IR::U1 any_zero{v.ir.LogicalOr(zero_a, zero_b)}; + value = IR::F32{v.ir.Select(any_zero, op_c, value)}; + } + if (sat) { + value = v.ir.FPSaturate(value); + } + v.F(ffma.dest_reg, value); +} + +void FFMA(TranslatorVisitor& v, u64 insn, const IR::F32& src_b, const IR::F32& src_c) { + union { + u64 raw; + BitField<47, 1, u64> cc; + BitField<48, 1, u64> neg_b; + BitField<49, 1, u64> neg_c; + BitField<50, 1, u64> sat; + BitField<51, 2, FpRounding> fp_rounding; + BitField<53, 2, FmzMode> fmz_mode; + } const ffma{insn}; + + FFMA(v, insn, src_b, src_c, false, ffma.neg_b != 0, ffma.neg_c != 0, ffma.sat != 0, + ffma.cc != 0, ffma.fmz_mode, ffma.fp_rounding); +} +} // Anonymous namespace + +void TranslatorVisitor::FFMA_reg(u64 insn) { + FFMA(*this, insn, GetFloatReg20(insn), GetFloatReg39(insn)); +} + +void TranslatorVisitor::FFMA_rc(u64 insn) { + FFMA(*this, insn, GetFloatReg39(insn), GetFloatCbuf(insn)); +} + +void TranslatorVisitor::FFMA_cr(u64 insn) { + FFMA(*this, insn, GetFloatCbuf(insn), GetFloatReg39(insn)); +} + +void TranslatorVisitor::FFMA_imm(u64 insn) { + FFMA(*this, insn, GetFloatImm20(insn), GetFloatReg39(insn)); +} + +void TranslatorVisitor::FFMA32I(u64 insn) { + union { + u64 raw; + BitField<0, 8, IR::Reg> src_c; // FFMA32I mirrors the destination and addition register + BitField<52, 1, u64> cc; + BitField<53, 2, FmzMode> fmz_mode; + BitField<55, 1, u64> sat; + BitField<56, 1, u64> neg_a; + BitField<57, 1, u64> neg_c; + } const ffma32i{insn}; + + FFMA(*this, insn, GetFloatImm32(insn), F(ffma32i.src_c), ffma32i.neg_a != 0, false, + ffma32i.neg_c != 0, ffma32i.sat != 0, ffma32i.cc != 0, ffma32i.fmz_mode, FpRounding::RN); +} + +} // namespace Shader::Maxwell |