1 //===- MipsLegalizerInfo.cpp ------------------------------------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 /// \file
9 /// This file implements the targeting of the Machinelegalizer class for Mips.
10 /// \todo This should be generated by TableGen.
11 //===----------------------------------------------------------------------===//
12 
13 #include "MipsLegalizerInfo.h"
14 #include "MipsTargetMachine.h"
15 #include "llvm/CodeGen/GlobalISel/LegalizerHelper.h"
16 
17 using namespace llvm;
18 
19 MipsLegalizerInfo::MipsLegalizerInfo(const MipsSubtarget &ST) {
20   using namespace TargetOpcode;
21 
22   const LLT s1 = LLT::scalar(1);
23   const LLT s32 = LLT::scalar(32);
24   const LLT s64 = LLT::scalar(64);
25   const LLT p0 = LLT::pointer(0, 32);
26 
27   getActionDefinitionsBuilder({G_ADD, G_SUB, G_MUL})
28       .legalFor({s32})
29       .clampScalar(0, s32, s32);
30 
31   getActionDefinitionsBuilder({G_UADDO, G_UADDE, G_USUBO, G_USUBE, G_UMULO})
32       .lowerFor({{s32, s1}});
33 
34   getActionDefinitionsBuilder(G_UMULH)
35       .legalFor({s32})
36       .maxScalar(0, s32);
37 
38   getActionDefinitionsBuilder({G_LOAD, G_STORE})
39       .legalForTypesWithMemDesc({{s32, p0, 8, 8},
40                                  {s32, p0, 16, 8},
41                                  {s32, p0, 32, 8},
42                                  {p0, p0, 32, 8}})
43       .minScalar(0, s32);
44 
45   getActionDefinitionsBuilder({G_ZEXTLOAD, G_SEXTLOAD})
46     .legalForTypesWithMemDesc({{s32, p0, 8, 8},
47                                {s32, p0, 16, 8}})
48       .minScalar(0, s32);
49 
50   getActionDefinitionsBuilder(G_SELECT)
51       .legalForCartesianProduct({p0, s32}, {s32})
52       .minScalar(0, s32)
53       .minScalar(1, s32);
54 
55   getActionDefinitionsBuilder(G_BRCOND)
56       .legalFor({s32})
57       .minScalar(0, s32);
58 
59   getActionDefinitionsBuilder(G_PHI)
60       .legalFor({p0, s32})
61       .minScalar(0, s32);
62 
63   getActionDefinitionsBuilder({G_AND, G_OR, G_XOR})
64       .legalFor({s32})
65       .clampScalar(0, s32, s32);
66 
67   getActionDefinitionsBuilder({G_SDIV, G_SREM, G_UREM, G_UDIV})
68       .legalFor({s32})
69       .minScalar(0, s32)
70       .libcallFor({s64});
71 
72   getActionDefinitionsBuilder({G_SHL, G_ASHR, G_LSHR})
73     .legalFor({s32, s32})
74     .minScalar(1, s32);
75 
76   getActionDefinitionsBuilder(G_ICMP)
77       .legalFor({{s32, s32}})
78       .minScalar(0, s32);
79 
80   getActionDefinitionsBuilder(G_CONSTANT)
81       .legalFor({s32})
82       .clampScalar(0, s32, s32);
83 
84   getActionDefinitionsBuilder(G_GEP)
85       .legalFor({{p0, s32}});
86 
87   getActionDefinitionsBuilder(G_FRAME_INDEX)
88       .legalFor({p0});
89 
90   getActionDefinitionsBuilder(G_GLOBAL_VALUE)
91       .legalFor({p0});
92 
93   // FP instructions
94   getActionDefinitionsBuilder(G_FCONSTANT)
95       .legalFor({s32, s64});
96 
97   getActionDefinitionsBuilder({G_FADD, G_FSUB, G_FMUL, G_FDIV, G_FABS, G_FSQRT})
98       .legalFor({s32, s64});
99 
100   getActionDefinitionsBuilder(G_FCMP)
101       .legalFor({{s32, s32}, {s32, s64}})
102       .minScalar(0, s32);
103 
104   getActionDefinitionsBuilder({G_FCEIL, G_FFLOOR})
105       .libcallFor({s32, s64});
106 
107   getActionDefinitionsBuilder(G_FPEXT)
108       .legalFor({{s64, s32}});
109 
110   getActionDefinitionsBuilder(G_FPTRUNC)
111       .legalFor({{s32, s64}});
112 
113   // FP to int conversion instructions
114   getActionDefinitionsBuilder(G_FPTOSI)
115       .legalForCartesianProduct({s32}, {s64, s32})
116       .libcallForCartesianProduct({s64}, {s64, s32})
117       .minScalar(0, s32);
118 
119   getActionDefinitionsBuilder(G_FPTOUI)
120       .libcallForCartesianProduct({s64}, {s64, s32})
121       .minScalar(0, s32);
122 
123   // Int to FP conversion instructions
124   getActionDefinitionsBuilder(G_SITOFP)
125       .legalForCartesianProduct({s64, s32}, {s32})
126       .libcallForCartesianProduct({s64, s32}, {s64})
127       .minScalar(1, s32);
128 
129   getActionDefinitionsBuilder(G_UITOFP)
130       .libcallForCartesianProduct({s64, s32}, {s64})
131       .minScalar(1, s32);
132 
133   computeTables();
134   verify(*ST.getInstrInfo());
135 }
136 
137 bool MipsLegalizerInfo::legalizeCustom(MachineInstr &MI,
138                                        MachineRegisterInfo &MRI,
139                                        MachineIRBuilder &MIRBuilder,
140                                        GISelChangeObserver &Observer) const {
141 
142   using namespace TargetOpcode;
143 
144   MIRBuilder.setInstr(MI);
145 
146   return false;
147 }
148