blob: f145bf9130251a8795690dbb16e874bff407f7d6 [file] [log] [blame]
/*
* Copyright (C) 2017 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common_arm64.h"
#include "nodes_shared.h"
namespace art {
using helpers::CanFitInShifterOperand;
void HDataProcWithShifterOp::GetOpInfoFromInstruction(HInstruction* instruction,
/*out*/OpKind* op_kind,
/*out*/int* shift_amount) {
DCHECK(CanFitInShifterOperand(instruction));
if (instruction->IsShl()) {
*op_kind = kLSL;
*shift_amount = instruction->AsShl()->GetRight()->AsIntConstant()->GetValue();
} else if (instruction->IsShr()) {
*op_kind = kASR;
*shift_amount = instruction->AsShr()->GetRight()->AsIntConstant()->GetValue();
} else if (instruction->IsUShr()) {
*op_kind = kLSR;
*shift_amount = instruction->AsUShr()->GetRight()->AsIntConstant()->GetValue();
} else {
DCHECK(instruction->IsTypeConversion());
Primitive::Type result_type = instruction->AsTypeConversion()->GetResultType();
Primitive::Type input_type = instruction->AsTypeConversion()->GetInputType();
int result_size = Primitive::ComponentSize(result_type);
int input_size = Primitive::ComponentSize(input_type);
int min_size = std::min(result_size, input_size);
if (result_type == Primitive::kPrimInt && input_type == Primitive::kPrimLong) {
// There is actually nothing to do. On ARM the high register from the
// pair will be ignored. On ARM64 the register will be used as a W
// register, discarding the top bits. This is represented by the
// default encoding 'LSL 0'.
*op_kind = kLSL;
*shift_amount = 0;
} else if (result_type == Primitive::kPrimChar ||
(input_type == Primitive::kPrimChar && input_size < result_size)) {
*op_kind = kUXTH;
} else {
switch (min_size) {
case 1: *op_kind = kSXTB; break;
case 2: *op_kind = kSXTH; break;
case 4: *op_kind = kSXTW; break;
default:
LOG(FATAL) << "Unexpected min size " << min_size;
}
}
}
}
std::ostream& operator<<(std::ostream& os, const HDataProcWithShifterOp::OpKind op) {
switch (op) {
case HDataProcWithShifterOp::kLSL: return os << "LSL";
case HDataProcWithShifterOp::kLSR: return os << "LSR";
case HDataProcWithShifterOp::kASR: return os << "ASR";
case HDataProcWithShifterOp::kUXTB: return os << "UXTB";
case HDataProcWithShifterOp::kUXTH: return os << "UXTH";
case HDataProcWithShifterOp::kUXTW: return os << "UXTW";
case HDataProcWithShifterOp::kSXTB: return os << "SXTB";
case HDataProcWithShifterOp::kSXTH: return os << "SXTH";
case HDataProcWithShifterOp::kSXTW: return os << "SXTW";
default:
LOG(FATAL) << "Invalid OpKind " << static_cast<int>(op);
UNREACHABLE();
}
}
} // namespace art