1//===-- R600TargetMachine.cpp - TargetMachine for hw codegen targets-------===//
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/// \file
10/// This file contains both AMDGPU-R600 target machine and the CodeGen pass
11/// builder. The target machine contains all of the hardware specific
12/// information needed to emit code for R600 GPUs and the CodeGen pass builder
13/// handles the pass pipeline for new pass manager.
14//
15//===----------------------------------------------------------------------===//
16
17#include "R600TargetMachine.h"
18#include "R600.h"
19#include "R600MachineFunctionInfo.h"
20#include "R600MachineScheduler.h"
21#include "R600TargetTransformInfo.h"
22#include "llvm/Transforms/Scalar.h"
23#include <optional>
24
25using namespace llvm;
26
27static cl::opt<bool>
28 EnableR600StructurizeCFG("r600-ir-structurize",
29 cl::desc("Use StructurizeCFG IR pass"),
30 cl::init(Val: true));
31
32static cl::opt<bool> EnableR600IfConvert("r600-if-convert",
33 cl::desc("Use if conversion pass"),
34 cl::ReallyHidden, cl::init(Val: true));
35
36static cl::opt<bool, true> EnableAMDGPUFunctionCallsOpt(
37 "amdgpu-function-calls", cl::desc("Enable AMDGPU function call support"),
38 cl::location(L&: AMDGPUTargetMachine::EnableFunctionCalls), cl::init(Val: true),
39 cl::Hidden);
40
41static ScheduleDAGInstrs *createR600MachineScheduler(MachineSchedContext *C) {
42 return new ScheduleDAGMILive(C, std::make_unique<R600SchedStrategy>());
43}
44
45static MachineSchedRegistry R600SchedRegistry("r600",
46 "Run R600's custom scheduler",
47 createR600MachineScheduler);
48
49//===----------------------------------------------------------------------===//
50// R600 Target Machine (R600 -> Cayman)
51//===----------------------------------------------------------------------===//
52
53R600TargetMachine::R600TargetMachine(const Target &T, const Triple &TT,
54 StringRef CPU, StringRef FS,
55 const TargetOptions &Options,
56 std::optional<Reloc::Model> RM,
57 std::optional<CodeModel::Model> CM,
58 CodeGenOptLevel OL, bool JIT)
59 : AMDGPUTargetMachine(T, TT, CPU, FS, Options, RM, CM, OL) {
60 setRequiresStructuredCFG(true);
61
62 // Override the default since calls aren't supported for r600.
63 if (EnableFunctionCalls &&
64 EnableAMDGPUFunctionCallsOpt.getNumOccurrences() == 0)
65 EnableFunctionCalls = false;
66}
67
68const TargetSubtargetInfo *
69R600TargetMachine::getSubtargetImpl(const Function &F) const {
70 StringRef GPU = getGPUName(F);
71 StringRef FS = getFeatureString(F);
72
73 SmallString<128> SubtargetKey(GPU);
74 SubtargetKey.append(RHS: FS);
75
76 auto &I = SubtargetMap[SubtargetKey];
77 if (!I) {
78 // This needs to be done before we create a new subtarget since any
79 // creation will depend on the TM and the code generation flags on the
80 // function that reside in TargetOptions.
81 resetTargetOptions(F);
82 I = std::make_unique<R600Subtarget>(args: TargetTriple, args&: GPU, args&: FS, args: *this);
83 }
84
85 return I.get();
86}
87
88TargetTransformInfo
89R600TargetMachine::getTargetTransformInfo(const Function &F) const {
90 return TargetTransformInfo(std::make_unique<R600TTIImpl>(args: this, args: F));
91}
92
93ScheduleDAGInstrs *
94R600TargetMachine::createMachineScheduler(MachineSchedContext *C) const {
95 return createR600MachineScheduler(C);
96}
97
98namespace {
99class R600PassConfig final : public AMDGPUPassConfig {
100public:
101 R600PassConfig(TargetMachine &TM, PassManagerBase &PM)
102 : AMDGPUPassConfig(TM, PM) {}
103
104 bool addPreISel() override;
105 bool addInstSelector() override;
106 void addPreRegAlloc() override;
107 void addPreSched2() override;
108 void addPreEmitPass() override;
109};
110} // namespace
111
112//===----------------------------------------------------------------------===//
113// R600 Pass Setup
114//===----------------------------------------------------------------------===//
115
116bool R600PassConfig::addPreISel() {
117 AMDGPUPassConfig::addPreISel();
118
119 if (EnableR600StructurizeCFG)
120 addPass(P: createStructurizeCFGPass());
121 return false;
122}
123
124bool R600PassConfig::addInstSelector() {
125 addPass(P: createR600ISelDag(TM&: getAMDGPUTargetMachine(), OptLevel: getOptLevel()));
126 return false;
127}
128
129void R600PassConfig::addPreRegAlloc() { addPass(P: createR600VectorRegMerger()); }
130
131void R600PassConfig::addPreSched2() {
132 addPass(P: createR600EmitClauseMarkers());
133 if (EnableR600IfConvert)
134 addPass(PassID: &IfConverterID);
135 addPass(P: createR600ClauseMergePass());
136}
137
138void R600PassConfig::addPreEmitPass() {
139 addPass(P: createR600MachineCFGStructurizerPass());
140 addPass(P: createR600ExpandSpecialInstrsPass());
141 addPass(PassID: &FinalizeMachineBundlesID);
142 addPass(P: createR600Packetizer());
143 addPass(P: createR600ControlFlowFinalizer());
144}
145
146TargetPassConfig *R600TargetMachine::createPassConfig(PassManagerBase &PM) {
147 return new R600PassConfig(*this, PM);
148}
149
150Error R600TargetMachine::buildCodeGenPipeline(
151 ModulePassManager &MPM, raw_pwrite_stream &Out, raw_pwrite_stream *DwoOut,
152 CodeGenFileType FileType, const CGPassBuilderOption &Opts,
153 PassInstrumentationCallbacks *PIC) {
154 R600CodeGenPassBuilder CGPB(*this, Opts, PIC);
155 return CGPB.buildPipeline(MPM, Out, DwoOut, FileType);
156}
157
158MachineFunctionInfo *R600TargetMachine::createMachineFunctionInfo(
159 BumpPtrAllocator &Allocator, const Function &F,
160 const TargetSubtargetInfo *STI) const {
161 return R600MachineFunctionInfo::create<R600MachineFunctionInfo>(
162 Allocator, F, STI: static_cast<const R600Subtarget *>(STI));
163}
164
165//===----------------------------------------------------------------------===//
166// R600 CodeGen Pass Builder interface.
167//===----------------------------------------------------------------------===//
168
169R600CodeGenPassBuilder::R600CodeGenPassBuilder(
170 R600TargetMachine &TM, const CGPassBuilderOption &Opts,
171 PassInstrumentationCallbacks *PIC)
172 : CodeGenPassBuilder(TM, Opts, PIC) {
173 Opt.RequiresCodeGenSCCOrder = true;
174}
175
176void R600CodeGenPassBuilder::addPreISel(AddIRPass &addPass) const {
177 // TODO: Add passes pre instruction selection.
178}
179
180void R600CodeGenPassBuilder::addAsmPrinter(AddMachinePass &addPass,
181 CreateMCStreamer) const {
182 // TODO: Add AsmPrinter.
183}
184
185Error R600CodeGenPassBuilder::addInstSelector(AddMachinePass &) const {
186 // TODO: Add instruction selector.
187 return Error::success();
188}
189