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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::DecodeIntegerSet(BasicBlock& bb, const BasicBlock& code, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
const Node op_a = GetRegister(instr.gpr8);
const Node op_b = [&]() {
if (instr.is_b_imm) {
return Immediate(instr.alu.GetSignedImm20_20());
} else if (instr.is_b_gpr) {
return GetRegister(instr.gpr20);
} else {
return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
}
}();
// The iset instruction sets a register to 1.0 or -1 (depending on the bf bit) if the condition
// is true, and to 0 otherwise.
const Node second_pred = GetPredicate(instr.iset.pred39, instr.iset.neg_pred != 0);
const Node first_pred =
GetPredicateComparisonInteger(instr.iset.cond, instr.iset.is_signed, op_a, op_b);
const OperationCode combiner = GetPredicateCombiner(instr.iset.op);
const Node predicate = Operation(combiner, first_pred, second_pred);
const Node true_value = instr.iset.bf ? Immediate(1.0f) : Immediate(-1);
const Node false_value = instr.iset.bf ? Immediate(0.0f) : Immediate(0);
const Node value =
Operation(OperationCode::Select, PRECISE, predicate, true_value, false_value);
SetRegister(bb, instr.gpr0, value);
return pc;
}
} // namespace VideoCommon::Shader
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