1 /*
2 * Copyright (C) 2015 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 #include "common_arm64.h"
18 #include "nodes.h"
19
20 namespace art {
21
22 using arm64::helpers::CanFitInShifterOperand;
23
GetOpInfoFromInstruction(HInstruction * instruction,OpKind * op_kind,int * shift_amount)24 void HArm64DataProcWithShifterOp::GetOpInfoFromInstruction(HInstruction* instruction,
25 /*out*/OpKind* op_kind,
26 /*out*/int* shift_amount) {
27 DCHECK(CanFitInShifterOperand(instruction));
28 if (instruction->IsShl()) {
29 *op_kind = kLSL;
30 *shift_amount = instruction->AsShl()->GetRight()->AsIntConstant()->GetValue();
31 } else if (instruction->IsShr()) {
32 *op_kind = kASR;
33 *shift_amount = instruction->AsShr()->GetRight()->AsIntConstant()->GetValue();
34 } else if (instruction->IsUShr()) {
35 *op_kind = kLSR;
36 *shift_amount = instruction->AsUShr()->GetRight()->AsIntConstant()->GetValue();
37 } else {
38 DCHECK(instruction->IsTypeConversion());
39 Primitive::Type result_type = instruction->AsTypeConversion()->GetResultType();
40 Primitive::Type input_type = instruction->AsTypeConversion()->GetInputType();
41 int result_size = Primitive::ComponentSize(result_type);
42 int input_size = Primitive::ComponentSize(input_type);
43 int min_size = std::min(result_size, input_size);
44 // This follows the logic in
45 // `InstructionCodeGeneratorARM64::VisitTypeConversion()`.
46 if (result_type == Primitive::kPrimInt && input_type == Primitive::kPrimLong) {
47 // There is actually nothing to do. The register will be used as a W
48 // register, discarding the top bits. This is represented by the default
49 // encoding 'LSL 0'.
50 *op_kind = kLSL;
51 *shift_amount = 0;
52 } else if (result_type == Primitive::kPrimChar ||
53 (input_type == Primitive::kPrimChar && input_size < result_size)) {
54 *op_kind = kUXTH;
55 } else {
56 switch (min_size) {
57 case 1: *op_kind = kSXTB; break;
58 case 2: *op_kind = kSXTH; break;
59 case 4: *op_kind = kSXTW; break;
60 default:
61 LOG(FATAL) << "Unexpected min size " << min_size;
62 }
63 }
64 }
65 }
66
operator <<(std::ostream & os,const HArm64DataProcWithShifterOp::OpKind op)67 std::ostream& operator<<(std::ostream& os, const HArm64DataProcWithShifterOp::OpKind op) {
68 switch (op) {
69 case HArm64DataProcWithShifterOp::kLSL: return os << "LSL";
70 case HArm64DataProcWithShifterOp::kLSR: return os << "LSR";
71 case HArm64DataProcWithShifterOp::kASR: return os << "ASR";
72 case HArm64DataProcWithShifterOp::kUXTB: return os << "UXTB";
73 case HArm64DataProcWithShifterOp::kUXTH: return os << "UXTH";
74 case HArm64DataProcWithShifterOp::kUXTW: return os << "UXTW";
75 case HArm64DataProcWithShifterOp::kSXTB: return os << "SXTB";
76 case HArm64DataProcWithShifterOp::kSXTH: return os << "SXTH";
77 case HArm64DataProcWithShifterOp::kSXTW: return os << "SXTW";
78 default:
79 LOG(FATAL) << "Invalid OpKind " << static_cast<int>(op);
80 UNREACHABLE();
81 }
82 }
83
84 } // namespace art
85