/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/include/llvm/CodeGen/SelectionDAGTargetInfo.h
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1 | | //==- llvm/CodeGen/SelectionDAGTargetInfo.h - SelectionDAG Info --*- C++ -*-==// |
2 | | // |
3 | | // The LLVM Compiler Infrastructure |
4 | | // |
5 | | // This file is distributed under the University of Illinois Open Source |
6 | | // License. See LICENSE.TXT for details. |
7 | | // |
8 | | //===----------------------------------------------------------------------===// |
9 | | // |
10 | | // This file declares the SelectionDAGTargetInfo class, which targets can |
11 | | // subclass to parameterize the SelectionDAG lowering and instruction |
12 | | // selection process. |
13 | | // |
14 | | //===----------------------------------------------------------------------===// |
15 | | |
16 | | #ifndef LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H |
17 | | #define LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H |
18 | | |
19 | | #include "llvm/CodeGen/MachineMemOperand.h" |
20 | | #include "llvm/CodeGen/SelectionDAGNodes.h" |
21 | | #include "llvm/Support/CodeGen.h" |
22 | | #include <utility> |
23 | | |
24 | | namespace llvm { |
25 | | |
26 | | class SelectionDAG; |
27 | | |
28 | | //===----------------------------------------------------------------------===// |
29 | | /// Targets can subclass this to parameterize the |
30 | | /// SelectionDAG lowering and instruction selection process. |
31 | | /// |
32 | | class SelectionDAGTargetInfo { |
33 | | public: |
34 | 44.6k | explicit SelectionDAGTargetInfo() = default; |
35 | | SelectionDAGTargetInfo(const SelectionDAGTargetInfo &) = delete; |
36 | | SelectionDAGTargetInfo &operator=(const SelectionDAGTargetInfo &) = delete; |
37 | | virtual ~SelectionDAGTargetInfo(); |
38 | | |
39 | | /// Emit target-specific code that performs a memcpy. |
40 | | /// This can be used by targets to provide code sequences for cases |
41 | | /// that don't fit the target's parameters for simple loads/stores and can be |
42 | | /// more efficient than using a library call. This function can return a null |
43 | | /// SDValue if the target declines to use custom code and a different |
44 | | /// lowering strategy should be used. |
45 | | /// |
46 | | /// If AlwaysInline is true, the size is constant and the target should not |
47 | | /// emit any calls and is strongly encouraged to attempt to emit inline code |
48 | | /// even if it is beyond the usual threshold because this intrinsic is being |
49 | | /// expanded in a place where calls are not feasible (e.g. within the prologue |
50 | | /// for another call). If the target chooses to decline an AlwaysInline |
51 | | /// request here, legalize will resort to using simple loads and stores. |
52 | | virtual SDValue EmitTargetCodeForMemcpy(SelectionDAG &DAG, const SDLoc &dl, |
53 | | SDValue Chain, SDValue Op1, |
54 | | SDValue Op2, SDValue Op3, |
55 | | unsigned Align, bool isVolatile, |
56 | | bool AlwaysInline, |
57 | | MachinePointerInfo DstPtrInfo, |
58 | 8.01k | MachinePointerInfo SrcPtrInfo) const { |
59 | 8.01k | return SDValue(); |
60 | 8.01k | } |
61 | | |
62 | | /// Emit target-specific code that performs a memmove. |
63 | | /// This can be used by targets to provide code sequences for cases |
64 | | /// that don't fit the target's parameters for simple loads/stores and can be |
65 | | /// more efficient than using a library call. This function can return a null |
66 | | /// SDValue if the target declines to use custom code and a different |
67 | | /// lowering strategy should be used. |
68 | | virtual SDValue EmitTargetCodeForMemmove( |
69 | | SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, SDValue Op1, |
70 | | SDValue Op2, SDValue Op3, unsigned Align, bool isVolatile, |
71 | 232 | MachinePointerInfo DstPtrInfo, MachinePointerInfo SrcPtrInfo) const { |
72 | 232 | return SDValue(); |
73 | 232 | } |
74 | | |
75 | | /// Emit target-specific code that performs a memset. |
76 | | /// This can be used by targets to provide code sequences for cases |
77 | | /// that don't fit the target's parameters for simple stores and can be more |
78 | | /// efficient than using a library call. This function can return a null |
79 | | /// SDValue if the target declines to use custom code and a different |
80 | | /// lowering strategy should be used. |
81 | | virtual SDValue EmitTargetCodeForMemset(SelectionDAG &DAG, const SDLoc &dl, |
82 | | SDValue Chain, SDValue Op1, |
83 | | SDValue Op2, SDValue Op3, |
84 | | unsigned Align, bool isVolatile, |
85 | 17 | MachinePointerInfo DstPtrInfo) const { |
86 | 17 | return SDValue(); |
87 | 17 | } |
88 | | |
89 | | /// Emit target-specific code that performs a memcmp, in cases where that is |
90 | | /// faster than a libcall. The first returned SDValue is the result of the |
91 | | /// memcmp and the second is the chain. Both SDValues can be null if a normal |
92 | | /// libcall should be used. |
93 | | virtual std::pair<SDValue, SDValue> |
94 | | EmitTargetCodeForMemcmp(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, |
95 | | SDValue Op1, SDValue Op2, SDValue Op3, |
96 | | MachinePointerInfo Op1PtrInfo, |
97 | 666 | MachinePointerInfo Op2PtrInfo) const { |
98 | 666 | return std::make_pair(SDValue(), SDValue()); |
99 | 666 | } |
100 | | |
101 | | /// Emit target-specific code that performs a memchr, in cases where that is |
102 | | /// faster than a libcall. The first returned SDValue is the result of the |
103 | | /// memchr and the second is the chain. Both SDValues can be null if a normal |
104 | | /// libcall should be used. |
105 | | virtual std::pair<SDValue, SDValue> |
106 | | EmitTargetCodeForMemchr(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, |
107 | | SDValue Src, SDValue Char, SDValue Length, |
108 | 77 | MachinePointerInfo SrcPtrInfo) const { |
109 | 77 | return std::make_pair(SDValue(), SDValue()); |
110 | 77 | } |
111 | | |
112 | | /// Emit target-specific code that performs a strcpy or stpcpy, in cases |
113 | | /// where that is faster than a libcall. |
114 | | /// The first returned SDValue is the result of the copy (the start |
115 | | /// of the destination string for strcpy, a pointer to the null terminator |
116 | | /// for stpcpy) and the second is the chain. Both SDValues can be null |
117 | | /// if a normal libcall should be used. |
118 | | virtual std::pair<SDValue, SDValue> |
119 | | EmitTargetCodeForStrcpy(SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, |
120 | | SDValue Dest, SDValue Src, |
121 | | MachinePointerInfo DestPtrInfo, |
122 | 835 | MachinePointerInfo SrcPtrInfo, bool isStpcpy) const { |
123 | 835 | return std::make_pair(SDValue(), SDValue()); |
124 | 835 | } |
125 | | |
126 | | /// Emit target-specific code that performs a strcmp, in cases where that is |
127 | | /// faster than a libcall. |
128 | | /// The first returned SDValue is the result of the strcmp and the second is |
129 | | /// the chain. Both SDValues can be null if a normal libcall should be used. |
130 | | virtual std::pair<SDValue, SDValue> |
131 | | EmitTargetCodeForStrcmp(SelectionDAG &DAG, const SDLoc &dl, SDValue Chain, |
132 | | SDValue Op1, SDValue Op2, |
133 | | MachinePointerInfo Op1PtrInfo, |
134 | 11.9k | MachinePointerInfo Op2PtrInfo) const { |
135 | 11.9k | return std::make_pair(SDValue(), SDValue()); |
136 | 11.9k | } |
137 | | |
138 | | virtual std::pair<SDValue, SDValue> |
139 | | EmitTargetCodeForStrlen(SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, |
140 | 3.31k | SDValue Src, MachinePointerInfo SrcPtrInfo) const { |
141 | 3.31k | return std::make_pair(SDValue(), SDValue()); |
142 | 3.31k | } |
143 | | |
144 | | virtual std::pair<SDValue, SDValue> |
145 | | EmitTargetCodeForStrnlen(SelectionDAG &DAG, const SDLoc &DL, SDValue Chain, |
146 | | SDValue Src, SDValue MaxLength, |
147 | 2 | MachinePointerInfo SrcPtrInfo) const { |
148 | 2 | return std::make_pair(SDValue(), SDValue()); |
149 | 2 | } |
150 | | |
151 | | // Return true when the decision to generate FMA's (or FMS, FMLA etc) rather |
152 | | // than FMUL and ADD is delegated to the machine combiner. |
153 | 7.29k | virtual bool generateFMAsInMachineCombiner(CodeGenOpt::Level OptLevel) const { |
154 | 7.29k | return false; |
155 | 7.29k | } |
156 | | }; |
157 | | |
158 | | } // end namespace llvm |
159 | | |
160 | | #endif // LLVM_CODEGEN_SELECTIONDAGTARGETINFO_H |