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a7d6bd1ef1
I2F's byte selector is used to choose what bytes to convert to float. e.g. if the input is 0xaabbccdd and the selector is ".B3" it will convert 0xaa. The default (when it's not shown in nvdisasm) is ".B0", in that example the default would convert 0xdd to float.
229 lines
9 KiB
C++
229 lines
9 KiB
C++
// Copyright 2018 yuzu Emulator Project
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// Licensed under GPLv2 or any later version
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// Refer to the license.txt file included.
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#include "common/assert.h"
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#include "common/common_types.h"
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#include "video_core/engines/shader_bytecode.h"
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#include "video_core/shader/node_helper.h"
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#include "video_core/shader/shader_ir.h"
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namespace VideoCommon::Shader {
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using Tegra::Shader::Instruction;
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using Tegra::Shader::OpCode;
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using Tegra::Shader::Register;
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namespace {
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constexpr OperationCode GetFloatSelector(u64 selector) {
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return selector == 0 ? OperationCode::FCastHalf0 : OperationCode::FCastHalf1;
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}
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} // Anonymous namespace
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u32 ShaderIR::DecodeConversion(NodeBlock& bb, u32 pc) {
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const Instruction instr = {program_code[pc]};
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const auto opcode = OpCode::Decode(instr);
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switch (opcode->get().GetId()) {
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case OpCode::Id::I2I_R:
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case OpCode::Id::I2I_C:
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case OpCode::Id::I2I_IMM: {
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UNIMPLEMENTED_IF(instr.conversion.int_src.selector != 0);
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UNIMPLEMENTED_IF(instr.conversion.dst_size != Register::Size::Word);
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UNIMPLEMENTED_IF(instr.alu.saturate_d);
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const bool input_signed = instr.conversion.is_input_signed;
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const bool output_signed = instr.conversion.is_output_signed;
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Node value = [&]() {
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switch (opcode->get().GetId()) {
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case OpCode::Id::I2I_R:
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return GetRegister(instr.gpr20);
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case OpCode::Id::I2I_C:
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return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
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case OpCode::Id::I2I_IMM:
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return Immediate(instr.alu.GetSignedImm20_20());
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default:
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UNREACHABLE();
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return Immediate(0);
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}
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}();
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value = ConvertIntegerSize(value, instr.conversion.src_size, input_signed);
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value = GetOperandAbsNegInteger(value, instr.conversion.abs_a, instr.conversion.negate_a,
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input_signed);
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if (input_signed != output_signed) {
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value = SignedOperation(OperationCode::ICastUnsigned, output_signed, NO_PRECISE, value);
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}
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SetInternalFlagsFromInteger(bb, value, instr.generates_cc);
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SetRegister(bb, instr.gpr0, value);
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break;
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}
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case OpCode::Id::I2F_R:
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case OpCode::Id::I2F_C:
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case OpCode::Id::I2F_IMM: {
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UNIMPLEMENTED_IF(instr.conversion.dst_size == Register::Size::Long);
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UNIMPLEMENTED_IF_MSG(instr.generates_cc,
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"Condition codes generation in I2F is not implemented");
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Node value = [&] {
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switch (opcode->get().GetId()) {
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case OpCode::Id::I2F_R:
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return GetRegister(instr.gpr20);
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case OpCode::Id::I2F_C:
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return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
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case OpCode::Id::I2F_IMM:
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return Immediate(instr.alu.GetSignedImm20_20());
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default:
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UNREACHABLE();
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return Immediate(0);
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}
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}();
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const bool input_signed = instr.conversion.is_input_signed;
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if (instr.conversion.src_size == Register::Size::Byte) {
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const u32 offset = static_cast<u32>(instr.conversion.int_src.selector) * 8;
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if (offset > 0) {
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value = SignedOperation(OperationCode::ILogicalShiftRight, input_signed,
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std::move(value), Immediate(offset));
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}
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} else {
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UNIMPLEMENTED_IF(instr.conversion.int_src.selector != 0);
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}
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value = ConvertIntegerSize(value, instr.conversion.src_size, input_signed);
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value = GetOperandAbsNegInteger(value, instr.conversion.abs_a, false, input_signed);
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value = SignedOperation(OperationCode::FCastInteger, input_signed, PRECISE, value);
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value = GetOperandAbsNegFloat(value, false, instr.conversion.negate_a);
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SetInternalFlagsFromFloat(bb, value, instr.generates_cc);
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if (instr.conversion.dst_size == Register::Size::Short) {
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value = Operation(OperationCode::HCastFloat, PRECISE, value);
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}
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SetRegister(bb, instr.gpr0, value);
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break;
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}
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case OpCode::Id::F2F_R:
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case OpCode::Id::F2F_C:
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case OpCode::Id::F2F_IMM: {
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UNIMPLEMENTED_IF(instr.conversion.dst_size == Register::Size::Long);
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UNIMPLEMENTED_IF(instr.conversion.src_size == Register::Size::Long);
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UNIMPLEMENTED_IF_MSG(instr.generates_cc,
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"Condition codes generation in F2F is not implemented");
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Node value = [&]() {
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switch (opcode->get().GetId()) {
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case OpCode::Id::F2F_R:
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return GetRegister(instr.gpr20);
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case OpCode::Id::F2F_C:
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return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
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case OpCode::Id::F2F_IMM:
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return GetImmediate19(instr);
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default:
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UNREACHABLE();
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return Immediate(0);
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}
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}();
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if (instr.conversion.src_size == Register::Size::Short) {
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value = Operation(GetFloatSelector(instr.conversion.float_src.selector), NO_PRECISE,
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std::move(value));
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} else {
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ASSERT(instr.conversion.float_src.selector == 0);
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}
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value = GetOperandAbsNegFloat(value, instr.conversion.abs_a, instr.conversion.negate_a);
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value = [&]() {
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switch (instr.conversion.f2f.GetRoundingMode()) {
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case Tegra::Shader::F2fRoundingOp::None:
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return value;
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case Tegra::Shader::F2fRoundingOp::Round:
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return Operation(OperationCode::FRoundEven, PRECISE, value);
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case Tegra::Shader::F2fRoundingOp::Floor:
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return Operation(OperationCode::FFloor, PRECISE, value);
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case Tegra::Shader::F2fRoundingOp::Ceil:
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return Operation(OperationCode::FCeil, PRECISE, value);
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case Tegra::Shader::F2fRoundingOp::Trunc:
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return Operation(OperationCode::FTrunc, PRECISE, value);
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default:
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UNIMPLEMENTED_MSG("Unimplemented F2F rounding mode {}",
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static_cast<u32>(instr.conversion.f2f.rounding.Value()));
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return value;
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}
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}();
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value = GetSaturatedFloat(value, instr.alu.saturate_d);
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SetInternalFlagsFromFloat(bb, value, instr.generates_cc);
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if (instr.conversion.dst_size == Register::Size::Short) {
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value = Operation(OperationCode::HCastFloat, PRECISE, value);
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}
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SetRegister(bb, instr.gpr0, value);
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break;
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}
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case OpCode::Id::F2I_R:
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case OpCode::Id::F2I_C:
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case OpCode::Id::F2I_IMM: {
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UNIMPLEMENTED_IF(instr.conversion.src_size == Register::Size::Long);
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UNIMPLEMENTED_IF_MSG(instr.generates_cc,
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"Condition codes generation in F2I is not implemented");
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Node value = [&]() {
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switch (opcode->get().GetId()) {
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case OpCode::Id::F2I_R:
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return GetRegister(instr.gpr20);
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case OpCode::Id::F2I_C:
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return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
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case OpCode::Id::F2I_IMM:
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return GetImmediate19(instr);
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default:
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UNREACHABLE();
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return Immediate(0);
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}
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}();
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if (instr.conversion.src_size == Register::Size::Short) {
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value = Operation(GetFloatSelector(instr.conversion.float_src.selector), NO_PRECISE,
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std::move(value));
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} else {
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ASSERT(instr.conversion.float_src.selector == 0);
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}
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value = GetOperandAbsNegFloat(value, instr.conversion.abs_a, instr.conversion.negate_a);
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value = [&]() {
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switch (instr.conversion.f2i.rounding) {
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case Tegra::Shader::F2iRoundingOp::RoundEven:
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return Operation(OperationCode::FRoundEven, PRECISE, value);
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case Tegra::Shader::F2iRoundingOp::Floor:
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return Operation(OperationCode::FFloor, PRECISE, value);
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case Tegra::Shader::F2iRoundingOp::Ceil:
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return Operation(OperationCode::FCeil, PRECISE, value);
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case Tegra::Shader::F2iRoundingOp::Trunc:
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return Operation(OperationCode::FTrunc, PRECISE, value);
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default:
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UNIMPLEMENTED_MSG("Unimplemented F2I rounding mode {}",
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static_cast<u32>(instr.conversion.f2i.rounding.Value()));
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return Immediate(0);
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}
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}();
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const bool is_signed = instr.conversion.is_output_signed;
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value = SignedOperation(OperationCode::ICastFloat, is_signed, PRECISE, value);
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value = ConvertIntegerSize(value, instr.conversion.dst_size, is_signed);
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SetRegister(bb, instr.gpr0, value);
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break;
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}
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default:
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UNIMPLEMENTED_MSG("Unhandled conversion instruction: {}", opcode->get().GetName());
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}
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return pc;
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}
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} // namespace VideoCommon::Shader
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