1//=== lib/CodeGen/GlobalISel/MipsPostLegalizerCombiner.cpp ----------------===//
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//
9// This pass does combining of machine instructions at the generic MI level,
10// after the legalizer.
11//
12//===----------------------------------------------------------------------===//
13
14#include "MCTargetDesc/MipsMCTargetDesc.h"
15#include "Mips.h"
16#include "MipsLegalizerInfo.h"
17#include "MipsSubtarget.h"
18#include "llvm/CodeGen/GlobalISel/Combiner.h"
19#include "llvm/CodeGen/GlobalISel/CombinerHelper.h"
20#include "llvm/CodeGen/GlobalISel/CombinerInfo.h"
21#include "llvm/CodeGen/GlobalISel/GIMatchTableExecutorImpl.h"
22#include "llvm/CodeGen/GlobalISel/GISelKnownBits.h"
23#include "llvm/CodeGen/GlobalISel/MIPatternMatch.h"
24#include "llvm/CodeGen/MachineDominators.h"
25#include "llvm/CodeGen/TargetPassConfig.h"
26#include "llvm/Target/TargetMachine.h"
27
28#define GET_GICOMBINER_DEPS
29#include "MipsGenPostLegalizeGICombiner.inc"
30#undef GET_GICOMBINER_DEPS
31
32#define DEBUG_TYPE "mips-postlegalizer-combiner"
33
34using namespace llvm;
35using namespace MIPatternMatch;
36
37namespace {
38#define GET_GICOMBINER_TYPES
39#include "MipsGenPostLegalizeGICombiner.inc"
40#undef GET_GICOMBINER_TYPES
41
42class MipsPostLegalizerCombinerImpl : public Combiner {
43protected:
44 const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig;
45 const MipsSubtarget &STI;
46 // TODO: Make CombinerHelper methods const.
47 mutable CombinerHelper Helper;
48
49public:
50 MipsPostLegalizerCombinerImpl(
51 MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC,
52 GISelKnownBits &KB, GISelCSEInfo *CSEInfo,
53 const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig,
54 const MipsSubtarget &STI, MachineDominatorTree *MDT,
55 const LegalizerInfo *LI);
56
57 static const char *getName() { return "MipsPostLegalizerCombiner"; }
58
59 bool tryCombineAll(MachineInstr &I) const override;
60
61private:
62#define GET_GICOMBINER_CLASS_MEMBERS
63#include "MipsGenPostLegalizeGICombiner.inc"
64#undef GET_GICOMBINER_CLASS_MEMBERS
65};
66
67#define GET_GICOMBINER_IMPL
68#include "MipsGenPostLegalizeGICombiner.inc"
69#undef GET_GICOMBINER_IMPL
70
71MipsPostLegalizerCombinerImpl::MipsPostLegalizerCombinerImpl(
72 MachineFunction &MF, CombinerInfo &CInfo, const TargetPassConfig *TPC,
73 GISelKnownBits &KB, GISelCSEInfo *CSEInfo,
74 const MipsPostLegalizerCombinerImplRuleConfig &RuleConfig,
75 const MipsSubtarget &STI, MachineDominatorTree *MDT,
76 const LegalizerInfo *LI)
77 : Combiner(MF, CInfo, TPC, &KB, CSEInfo), RuleConfig(RuleConfig), STI(STI),
78 Helper(Observer, B, /*IsPreLegalize*/ false, &KB, MDT, LI),
79#define GET_GICOMBINER_CONSTRUCTOR_INITS
80#include "MipsGenPostLegalizeGICombiner.inc"
81#undef GET_GICOMBINER_CONSTRUCTOR_INITS
82{
83}
84
85// Pass boilerplate
86// ================
87
88class MipsPostLegalizerCombiner : public MachineFunctionPass {
89public:
90 static char ID;
91
92 MipsPostLegalizerCombiner(bool IsOptNone = false);
93
94 StringRef getPassName() const override { return "MipsPostLegalizerCombiner"; }
95
96 bool runOnMachineFunction(MachineFunction &MF) override;
97
98 void getAnalysisUsage(AnalysisUsage &AU) const override;
99
100private:
101 bool IsOptNone;
102 MipsPostLegalizerCombinerImplRuleConfig RuleConfig;
103};
104} // end anonymous namespace
105
106void MipsPostLegalizerCombiner::getAnalysisUsage(AnalysisUsage &AU) const {
107 AU.addRequired<TargetPassConfig>();
108 AU.setPreservesCFG();
109 getSelectionDAGFallbackAnalysisUsage(AU);
110 AU.addRequired<GISelKnownBitsAnalysis>();
111 AU.addPreserved<GISelKnownBitsAnalysis>();
112 if (!IsOptNone) {
113 AU.addRequired<MachineDominatorTreeWrapperPass>();
114 AU.addPreserved<MachineDominatorTreeWrapperPass>();
115 }
116 MachineFunctionPass::getAnalysisUsage(AU);
117}
118
119MipsPostLegalizerCombiner::MipsPostLegalizerCombiner(bool IsOptNone)
120 : MachineFunctionPass(ID), IsOptNone(IsOptNone) {
121 initializeMipsPostLegalizerCombinerPass(*PassRegistry::getPassRegistry());
122
123 if (!RuleConfig.parseCommandLineOption())
124 report_fatal_error(reason: "Invalid rule identifier");
125}
126
127bool MipsPostLegalizerCombiner::runOnMachineFunction(MachineFunction &MF) {
128 if (MF.getProperties().hasProperty(
129 P: MachineFunctionProperties::Property::FailedISel))
130 return false;
131 auto *TPC = &getAnalysis<TargetPassConfig>();
132 const Function &F = MF.getFunction();
133 bool EnableOpt =
134 MF.getTarget().getOptLevel() != CodeGenOptLevel::None && !skipFunction(F);
135
136 const MipsSubtarget &ST = MF.getSubtarget<MipsSubtarget>();
137 const MipsLegalizerInfo *LI =
138 static_cast<const MipsLegalizerInfo *>(ST.getLegalizerInfo());
139
140 GISelKnownBits *KB = &getAnalysis<GISelKnownBitsAnalysis>().get(MF);
141 MachineDominatorTree *MDT =
142 IsOptNone ? nullptr
143 : &getAnalysis<MachineDominatorTreeWrapperPass>().getDomTree();
144 CombinerInfo CInfo(/*AllowIllegalOps*/ false, /*ShouldLegalizeIllegal*/ true,
145 LI, EnableOpt, F.hasOptSize(), F.hasMinSize());
146 MipsPostLegalizerCombinerImpl Impl(MF, CInfo, TPC, *KB, /*CSEInfo*/ nullptr,
147 RuleConfig, ST, MDT, LI);
148 return Impl.combineMachineInstrs();
149}
150
151char MipsPostLegalizerCombiner::ID = 0;
152INITIALIZE_PASS_BEGIN(MipsPostLegalizerCombiner, DEBUG_TYPE,
153 "Combine Mips machine instrs after legalization", false,
154 false)
155INITIALIZE_PASS_DEPENDENCY(TargetPassConfig)
156INITIALIZE_PASS_DEPENDENCY(GISelKnownBitsAnalysis)
157INITIALIZE_PASS_END(MipsPostLegalizerCombiner, DEBUG_TYPE,
158 "Combine Mips machine instrs after legalization", false,
159 false)
160
161namespace llvm {
162FunctionPass *createMipsPostLegalizeCombiner(bool IsOptNone) {
163 return new MipsPostLegalizerCombiner(IsOptNone);
164}
165} // end namespace llvm
166