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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#include "shader_recompiler/frontend/ir/ir_emitter.h"
#include "shader_recompiler/frontend/ir/opcodes.h"
#include "shader_recompiler/frontend/ir/value.h"
#include "shader_recompiler/ir_opt/passes.h"
namespace Shader::Optimization {
namespace {
constexpr s32 F64ToF32Exp = +1023 - 127;
constexpr s32 F32ToF64Exp = +127 - 1023;
IR::F32 PackedF64ToF32(IR::IREmitter& ir, const IR::Value& packed) {
const IR::U32 lo{ir.CompositeExtract(packed, 0)};
const IR::U32 hi{ir.CompositeExtract(packed, 1)};
const IR::U32 sign{ir.BitFieldExtract(hi, ir.Imm32(31), ir.Imm32(1))};
const IR::U32 exp{ir.BitFieldExtract(hi, ir.Imm32(20), ir.Imm32(11))};
const IR::U32 mantissa_hi{ir.BitFieldExtract(hi, ir.Imm32(0), ir.Imm32(20))};
const IR::U32 mantissa_lo{ir.BitFieldExtract(lo, ir.Imm32(29), ir.Imm32(3))};
const IR::U32 mantissa{
ir.BitwiseOr(ir.ShiftLeftLogical(mantissa_hi, ir.Imm32(3)), mantissa_lo)};
const IR::U32 exp_if_subnorm{
ir.Select(ir.IEqual(exp, ir.Imm32(0)), ir.Imm32(0), ir.IAdd(exp, ir.Imm32(F64ToF32Exp)))};
const IR::U32 exp_if_infnan{
ir.Select(ir.IEqual(exp, ir.Imm32(0x7ff)), ir.Imm32(0xff), exp_if_subnorm)};
const IR::U32 result{
ir.BitwiseOr(ir.ShiftLeftLogical(sign, ir.Imm32(31)),
ir.BitwiseOr(ir.ShiftLeftLogical(exp_if_infnan, ir.Imm32(23)), mantissa))};
return ir.BitCast<IR::F32>(result);
}
IR::Value F32ToPackedF64(IR::IREmitter& ir, const IR::Value& raw) {
const IR::U32 value{ir.BitCast<IR::U32>(IR::F32(raw))};
const IR::U32 sign{ir.BitFieldExtract(value, ir.Imm32(31), ir.Imm32(1))};
const IR::U32 exp{ir.BitFieldExtract(value, ir.Imm32(23), ir.Imm32(8))};
const IR::U32 mantissa{ir.BitFieldExtract(value, ir.Imm32(0), ir.Imm32(23))};
const IR::U32 mantissa_hi{ir.BitFieldExtract(mantissa, ir.Imm32(3), ir.Imm32(20))};
const IR::U32 mantissa_lo{ir.BitFieldExtract(mantissa, ir.Imm32(0), ir.Imm32(3))};
const IR::U32 exp_if_subnorm{
ir.Select(ir.IEqual(exp, ir.Imm32(0)), ir.Imm32(0), ir.IAdd(exp, ir.Imm32(F32ToF64Exp)))};
const IR::U32 exp_if_infnan{
ir.Select(ir.IEqual(exp, ir.Imm32(0xff)), ir.Imm32(0x7ff), exp_if_subnorm)};
const IR::U32 lo{ir.ShiftLeftLogical(mantissa_lo, ir.Imm32(29))};
const IR::U32 hi{
ir.BitwiseOr(ir.ShiftLeftLogical(sign, ir.Imm32(31)),
ir.BitwiseOr(ir.ShiftLeftLogical(exp_if_infnan, ir.Imm32(20)), mantissa_hi))};
return ir.CompositeConstruct(lo, hi);
}
IR::Opcode Replace(IR::Opcode op) {
switch (op) {
case IR::Opcode::FPAbs64:
return IR::Opcode::FPAbs32;
case IR::Opcode::FPAdd64:
return IR::Opcode::FPAdd32;
case IR::Opcode::FPCeil64:
return IR::Opcode::FPCeil32;
case IR::Opcode::FPFloor64:
return IR::Opcode::FPFloor32;
case IR::Opcode::FPFma64:
return IR::Opcode::FPFma32;
case IR::Opcode::FPMul64:
return IR::Opcode::FPMul32;
case IR::Opcode::FPNeg64:
return IR::Opcode::FPNeg32;
case IR::Opcode::FPRoundEven64:
return IR::Opcode::FPRoundEven32;
case IR::Opcode::FPSaturate64:
return IR::Opcode::FPSaturate32;
case IR::Opcode::FPClamp64:
return IR::Opcode::FPClamp32;
case IR::Opcode::FPTrunc64:
return IR::Opcode::FPTrunc32;
case IR::Opcode::CompositeConstructF64x2:
return IR::Opcode::CompositeConstructF32x2;
case IR::Opcode::CompositeConstructF64x3:
return IR::Opcode::CompositeConstructF32x3;
case IR::Opcode::CompositeConstructF64x4:
return IR::Opcode::CompositeConstructF32x4;
case IR::Opcode::CompositeExtractF64x2:
return IR::Opcode::CompositeExtractF32x2;
case IR::Opcode::CompositeExtractF64x3:
return IR::Opcode::CompositeExtractF32x3;
case IR::Opcode::CompositeExtractF64x4:
return IR::Opcode::CompositeExtractF32x4;
case IR::Opcode::CompositeInsertF64x2:
return IR::Opcode::CompositeInsertF32x2;
case IR::Opcode::CompositeInsertF64x3:
return IR::Opcode::CompositeInsertF32x3;
case IR::Opcode::CompositeInsertF64x4:
return IR::Opcode::CompositeInsertF32x4;
case IR::Opcode::FPOrdEqual64:
return IR::Opcode::FPOrdEqual32;
case IR::Opcode::FPUnordEqual64:
return IR::Opcode::FPUnordEqual32;
case IR::Opcode::FPOrdNotEqual64:
return IR::Opcode::FPOrdNotEqual32;
case IR::Opcode::FPUnordNotEqual64:
return IR::Opcode::FPUnordNotEqual32;
case IR::Opcode::FPOrdLessThan64:
return IR::Opcode::FPOrdLessThan32;
case IR::Opcode::FPUnordLessThan64:
return IR::Opcode::FPUnordLessThan32;
case IR::Opcode::FPOrdGreaterThan64:
return IR::Opcode::FPOrdGreaterThan32;
case IR::Opcode::FPUnordGreaterThan64:
return IR::Opcode::FPUnordGreaterThan32;
case IR::Opcode::FPOrdLessThanEqual64:
return IR::Opcode::FPOrdLessThanEqual32;
case IR::Opcode::FPUnordLessThanEqual64:
return IR::Opcode::FPUnordLessThanEqual32;
case IR::Opcode::FPOrdGreaterThanEqual64:
return IR::Opcode::FPOrdGreaterThanEqual32;
case IR::Opcode::FPUnordGreaterThanEqual64:
return IR::Opcode::FPUnordGreaterThanEqual32;
case IR::Opcode::FPIsNan64:
return IR::Opcode::FPIsNan32;
case IR::Opcode::ConvertS16F64:
return IR::Opcode::ConvertS16F32;
case IR::Opcode::ConvertS32F64:
return IR::Opcode::ConvertS32F32;
case IR::Opcode::ConvertS64F64:
return IR::Opcode::ConvertS64F32;
case IR::Opcode::ConvertU16F64:
return IR::Opcode::ConvertU16F32;
case IR::Opcode::ConvertU32F64:
return IR::Opcode::ConvertU32F32;
case IR::Opcode::ConvertU64F64:
return IR::Opcode::ConvertU64F32;
case IR::Opcode::ConvertF32F64:
return IR::Opcode::Identity;
case IR::Opcode::ConvertF64F32:
return IR::Opcode::Identity;
case IR::Opcode::ConvertF64S8:
return IR::Opcode::ConvertF32S8;
case IR::Opcode::ConvertF64S16:
return IR::Opcode::ConvertF32S16;
case IR::Opcode::ConvertF64S32:
return IR::Opcode::ConvertF32S32;
case IR::Opcode::ConvertF64S64:
return IR::Opcode::ConvertF32S64;
case IR::Opcode::ConvertF64U8:
return IR::Opcode::ConvertF32U8;
case IR::Opcode::ConvertF64U16:
return IR::Opcode::ConvertF32U16;
case IR::Opcode::ConvertF64U32:
return IR::Opcode::ConvertF32U32;
case IR::Opcode::ConvertF64U64:
return IR::Opcode::ConvertF32U64;
default:
return op;
}
}
void Lower(IR::Block& block, IR::Inst& inst) {
switch (inst.GetOpcode()) {
case IR::Opcode::PackDouble2x32: {
IR::IREmitter ir(block, IR::Block::InstructionList::s_iterator_to(inst));
inst.ReplaceUsesWith(PackedF64ToF32(ir, inst.Arg(0)));
break;
}
case IR::Opcode::UnpackDouble2x32: {
IR::IREmitter ir(block, IR::Block::InstructionList::s_iterator_to(inst));
inst.ReplaceUsesWith(F32ToPackedF64(ir, inst.Arg(0)));
break;
}
default:
inst.ReplaceOpcode(Replace(inst.GetOpcode()));
break;
}
}
} // Anonymous namespace
void LowerFp64ToFp32(IR::Program& program) {
for (IR::Block* const block : program.blocks) {
for (IR::Inst& inst : block->Instructions()) {
Lower(*block, inst);
}
}
}
} // namespace Shader::Optimization
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