1 /*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 // Note: this include order may seem strange and is against the regular style. However it is the
18 // required order as nodes_shared does not have the right dependency chain and compilation
19 // will fail (as AsType on HInstruction will be defined before the full Instruction).
20 #include "nodes.h"
21
22 #include "nodes_shared.h"
23
24 #include "common_arm64.h"
25
26 namespace art {
27
28 using helpers::CanFitInShifterOperand;
29
GetOpInfoFromInstruction(HInstruction * instruction,OpKind * op_kind,int * shift_amount)30 void HDataProcWithShifterOp::GetOpInfoFromInstruction(HInstruction* instruction,
31 /*out*/OpKind* op_kind,
32 /*out*/int* shift_amount) {
33 DCHECK(CanFitInShifterOperand(instruction));
34 if (instruction->IsShl()) {
35 *op_kind = kLSL;
36 *shift_amount = instruction->AsShl()->GetRight()->AsIntConstant()->GetValue();
37 } else if (instruction->IsShr()) {
38 *op_kind = kASR;
39 *shift_amount = instruction->AsShr()->GetRight()->AsIntConstant()->GetValue();
40 } else if (instruction->IsUShr()) {
41 *op_kind = kLSR;
42 *shift_amount = instruction->AsUShr()->GetRight()->AsIntConstant()->GetValue();
43 } else {
44 DCHECK(instruction->IsTypeConversion());
45 DataType::Type result_type = instruction->AsTypeConversion()->GetResultType();
46 DataType::Type input_type = instruction->AsTypeConversion()->GetInputType();
47 int result_size = DataType::Size(result_type);
48 int input_size = DataType::Size(input_type);
49 int min_size = std::min(result_size, input_size);
50 if (result_type == DataType::Type::kInt32 && input_type == DataType::Type::kInt64) {
51 // There is actually nothing to do. On ARM the high register from the
52 // pair will be ignored. On ARM64 the register will be used as a W
53 // register, discarding the top bits. This is represented by the
54 // default encoding 'LSL 0'.
55 *op_kind = kLSL;
56 *shift_amount = 0;
57 } else if (result_type == DataType::Type::kUint8 ||
58 (input_type == DataType::Type::kUint8 && input_size < result_size)) {
59 *op_kind = kUXTB;
60 } else if (result_type == DataType::Type::kUint16 ||
61 (input_type == DataType::Type::kUint16 && input_size < result_size)) {
62 *op_kind = kUXTH;
63 } else {
64 switch (min_size) {
65 case 1: *op_kind = kSXTB; break;
66 case 2: *op_kind = kSXTH; break;
67 case 4: *op_kind = kSXTW; break;
68 default:
69 LOG(FATAL) << "Unexpected min size " << min_size;
70 }
71 }
72 }
73 }
74
operator <<(std::ostream & os,const HDataProcWithShifterOp::OpKind op)75 std::ostream& operator<<(std::ostream& os, const HDataProcWithShifterOp::OpKind op) {
76 switch (op) {
77 case HDataProcWithShifterOp::kLSL: return os << "LSL";
78 case HDataProcWithShifterOp::kLSR: return os << "LSR";
79 case HDataProcWithShifterOp::kASR: return os << "ASR";
80 case HDataProcWithShifterOp::kUXTB: return os << "UXTB";
81 case HDataProcWithShifterOp::kUXTH: return os << "UXTH";
82 case HDataProcWithShifterOp::kUXTW: return os << "UXTW";
83 case HDataProcWithShifterOp::kSXTB: return os << "SXTB";
84 case HDataProcWithShifterOp::kSXTH: return os << "SXTH";
85 case HDataProcWithShifterOp::kSXTW: return os << "SXTW";
86 default:
87 LOG(FATAL) << "Invalid OpKind " << static_cast<int>(op);
88 UNREACHABLE();
89 }
90 }
91
92 } // namespace art
93