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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/assert.h"
#include "common/common_types.h"
#include "video_core/engines/shader_bytecode.h"
#include "video_core/shader/shader_ir.h"
namespace VideoCommon::Shader {
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
u32 ShaderIR::DecodeRegisterSetPredicate(BasicBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
UNIMPLEMENTED_IF(instr.r2p.mode != Tegra::Shader::R2pMode::Pr);
const Node apply_mask = [&]() {
switch (opcode->get().GetId()) {
case OpCode::Id::R2P_IMM:
return Immediate(static_cast<u32>(instr.r2p.immediate_mask));
default:
UNREACHABLE();
return Immediate(static_cast<u32>(instr.r2p.immediate_mask));
}
}();
const Node mask =
Operation(OperationCode::ULogicalShiftRight, NO_PRECISE, GetRegister(instr.gpr8),
Immediate(static_cast<u32>(instr.r2p.byte)));
constexpr u32 programmable_preds = 7;
for (u64 pred = 0; pred < programmable_preds; ++pred) {
const Node shift = Immediate(1u << static_cast<u32>(pred));
const Node apply_compare = Operation(OperationCode::UBitwiseAnd, NO_PRECISE, apply_mask, shift);
const Node condition = Operation(OperationCode::LogicalUEqual, apply_compare, Immediate(0));
const Node value_compare = Operation(OperationCode::UBitwiseAnd, NO_PRECISE, mask, shift);
const Node value = Operation(OperationCode::LogicalUEqual, value_compare, Immediate(0));
const Node code = Operation(OperationCode::LogicalAssign, GetPredicate(pred), value);
bb.push_back(Conditional(condition, {code}));
}
return pc;
}
} // namespace VideoCommon::Shader
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