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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