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93 lines
3.8 KiB
93 lines
3.8 KiB
4 months ago
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/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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// Note: this include order may seem strange and is against the regular style. However it is the
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// required order as nodes_shared does not have the right dependency chain and compilation
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// will fail (as AsType on HInstruction will be defined before the full Instruction).
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#include "nodes.h"
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#include "nodes_shared.h"
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#include "instruction_simplifier_shared.h"
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namespace art {
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using helpers::CanFitInShifterOperand;
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void HDataProcWithShifterOp::GetOpInfoFromInstruction(HInstruction* instruction,
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/*out*/OpKind* op_kind,
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/*out*/int* shift_amount) {
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DCHECK(CanFitInShifterOperand(instruction));
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if (instruction->IsShl()) {
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*op_kind = kLSL;
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*shift_amount = instruction->AsShl()->GetRight()->AsIntConstant()->GetValue();
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} else if (instruction->IsShr()) {
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*op_kind = kASR;
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*shift_amount = instruction->AsShr()->GetRight()->AsIntConstant()->GetValue();
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} else if (instruction->IsUShr()) {
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*op_kind = kLSR;
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*shift_amount = instruction->AsUShr()->GetRight()->AsIntConstant()->GetValue();
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} else {
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DCHECK(instruction->IsTypeConversion());
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DataType::Type result_type = instruction->AsTypeConversion()->GetResultType();
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DataType::Type input_type = instruction->AsTypeConversion()->GetInputType();
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int result_size = DataType::Size(result_type);
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int input_size = DataType::Size(input_type);
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int min_size = std::min(result_size, input_size);
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if (result_type == DataType::Type::kInt32 && input_type == DataType::Type::kInt64) {
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// There is actually nothing to do. On ARM the high register from the
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// pair will be ignored. On ARM64 the register will be used as a W
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// register, discarding the top bits. This is represented by the
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// default encoding 'LSL 0'.
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*op_kind = kLSL;
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*shift_amount = 0;
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} else if (result_type == DataType::Type::kUint8 ||
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(input_type == DataType::Type::kUint8 && input_size < result_size)) {
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*op_kind = kUXTB;
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} else if (result_type == DataType::Type::kUint16 ||
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(input_type == DataType::Type::kUint16 && input_size < result_size)) {
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*op_kind = kUXTH;
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} else {
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switch (min_size) {
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case 1: *op_kind = kSXTB; break;
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case 2: *op_kind = kSXTH; break;
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case 4: *op_kind = kSXTW; break;
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default:
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LOG(FATAL) << "Unexpected min size " << min_size;
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}
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}
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}
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}
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std::ostream& operator<<(std::ostream& os, const HDataProcWithShifterOp::OpKind op) {
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switch (op) {
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case HDataProcWithShifterOp::kLSL: return os << "LSL";
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case HDataProcWithShifterOp::kLSR: return os << "LSR";
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case HDataProcWithShifterOp::kASR: return os << "ASR";
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case HDataProcWithShifterOp::kUXTB: return os << "UXTB";
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case HDataProcWithShifterOp::kUXTH: return os << "UXTH";
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case HDataProcWithShifterOp::kUXTW: return os << "UXTW";
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case HDataProcWithShifterOp::kSXTB: return os << "SXTB";
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case HDataProcWithShifterOp::kSXTH: return os << "SXTH";
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case HDataProcWithShifterOp::kSXTW: return os << "SXTW";
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default:
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LOG(FATAL) << "Invalid OpKind " << static_cast<int>(op);
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UNREACHABLE();
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}
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}
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} // namespace art
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