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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include <array>
#include "common/assert.h"
#include "common/common_types.h"
#include "common/logging/log.h"
#include "video_core/engines/shader_bytecode.h"
#include "video_core/shader/node_helper.h"
#include "video_core/shader/shader_ir.h"
namespace VideoCommon::Shader {
using std::move;
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
using Tegra::Shader::PredCondition;
u32 ShaderIR::DecodeHalfSet(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
PredCondition cond{};
bool bf = false;
bool ftz = false;
bool neg_a = false;
bool abs_a = false;
bool neg_b = false;
bool abs_b = false;
switch (opcode->get().GetId()) {
case OpCode::Id::HSET2_C:
case OpCode::Id::HSET2_IMM:
cond = instr.hsetp2.cbuf_and_imm.cond;
bf = instr.Bit(53);
ftz = instr.Bit(54);
neg_a = instr.Bit(43);
abs_a = instr.Bit(44);
neg_b = instr.Bit(56);
abs_b = instr.Bit(54);
break;
case OpCode::Id::HSET2_R:
cond = instr.hsetp2.reg.cond;
bf = instr.Bit(49);
ftz = instr.Bit(50);
neg_a = instr.Bit(43);
abs_a = instr.Bit(44);
neg_b = instr.Bit(31);
abs_b = instr.Bit(30);
break;
default:
UNREACHABLE();
}
Node op_b = [this, instr, opcode] {
switch (opcode->get().GetId()) {
case OpCode::Id::HSET2_C:
// Inform as unimplemented as this is not tested.
UNIMPLEMENTED_MSG("HSET2_C is not implemented");
return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
case OpCode::Id::HSET2_R:
return GetRegister(instr.gpr20);
case OpCode::Id::HSET2_IMM:
return UnpackHalfImmediate(instr, true);
default:
UNREACHABLE();
return Node{};
}
}();
if (!ftz) {
LOG_DEBUG(HW_GPU, "{} without FTZ is not implemented", opcode->get().GetName());
}
Node op_a = UnpackHalfFloat(GetRegister(instr.gpr8), instr.hset2.type_a);
op_a = GetOperandAbsNegHalf(op_a, abs_a, neg_a);
switch (opcode->get().GetId()) {
case OpCode::Id::HSET2_R:
op_b = GetOperandAbsNegHalf(move(op_b), abs_b, neg_b);
[[fallthrough]];
case OpCode::Id::HSET2_C:
op_b = UnpackHalfFloat(move(op_b), instr.hset2.type_b);
break;
default:
break;
}
Node second_pred = GetPredicate(instr.hset2.pred39, instr.hset2.neg_pred);
Node comparison_pair = GetPredicateComparisonHalf(cond, op_a, op_b);
const OperationCode combiner = GetPredicateCombiner(instr.hset2.op);
// HSET2 operates on each half float in the pack.
std::array<Node, 2> values;
for (u32 i = 0; i < 2; ++i) {
const u32 raw_value = bf ? 0x3c00 : 0xffff;
Node true_value = Immediate(raw_value << (i * 16));
Node false_value = Immediate(0);
Node comparison = Operation(OperationCode::LogicalPick2, comparison_pair, Immediate(i));
Node predicate = Operation(combiner, comparison, second_pred);
values[i] =
Operation(OperationCode::Select, predicate, move(true_value), move(false_value));
}
Node value = Operation(OperationCode::UBitwiseOr, values[0], values[1]);
SetRegister(bb, instr.gpr0, move(value));
return pc;
}
} // namespace VideoCommon::Shader
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