1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
|
//===- Region.cpp ---------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/SandboxIR/Region.h"
#include "llvm/SandboxIR/Function.h"
namespace llvm::sandboxir {
InstructionCost ScoreBoard::getCost(Instruction *I) const {
auto *LLVMI = cast<llvm::Instruction>(I->Val);
SmallVector<const llvm::Value *> Operands(LLVMI->operands());
return TTI.getInstructionCost(LLVMI, Operands, CostKind);
}
void ScoreBoard::remove(Instruction *I) {
auto Cost = getCost(I);
if (Rgn.contains(I))
// If `I` is one the newly added ones, then we should adjust `AfterCost`
AfterCost -= Cost;
else
// If `I` is one of the original instructions (outside the region) then it
// is part of the original code, so adjust `BeforeCost`.
BeforeCost += Cost;
}
#ifndef NDEBUG
void ScoreBoard::dump() const { dump(dbgs()); }
#endif
Region::Region(Context &Ctx, TargetTransformInfo &TTI)
: Ctx(Ctx), Scoreboard(*this, TTI) {
LLVMContext &LLVMCtx = Ctx.LLVMCtx;
auto *RegionStrMD = MDString::get(LLVMCtx, RegionStr);
RegionMDN = MDNode::getDistinct(LLVMCtx, {RegionStrMD});
CreateInstCB = Ctx.registerCreateInstrCallback(
[this](Instruction *NewInst) { add(NewInst); });
EraseInstCB = Ctx.registerEraseInstrCallback(
[this](Instruction *ErasedInst) { remove(ErasedInst); });
}
Region::~Region() {
Ctx.unregisterCreateInstrCallback(CreateInstCB);
Ctx.unregisterEraseInstrCallback(EraseInstCB);
}
void Region::add(Instruction *I) {
Insts.insert(I);
// TODO: Consider tagging instructions lazily.
cast<llvm::Instruction>(I->Val)->setMetadata(MDKind, RegionMDN);
// Keep track of the instruction cost.
Scoreboard.add(I);
}
void Region::remove(Instruction *I) {
// Keep track of the instruction cost. This need to be done *before* we remove
// `I` from the region.
Scoreboard.remove(I);
Insts.remove(I);
cast<llvm::Instruction>(I->Val)->setMetadata(MDKind, nullptr);
}
#ifndef NDEBUG
bool Region::operator==(const Region &Other) const {
if (Insts.size() != Other.Insts.size())
return false;
if (!std::is_permutation(Insts.begin(), Insts.end(), Other.Insts.begin()))
return false;
return true;
}
void Region::dump(raw_ostream &OS) const {
for (auto *I : Insts)
OS << *I << "\n";
}
void Region::dump() const {
dump(dbgs());
dbgs() << "\n";
}
#endif // NDEBUG
SmallVector<std::unique_ptr<Region>>
Region::createRegionsFromMD(Function &F, TargetTransformInfo &TTI) {
SmallVector<std::unique_ptr<Region>> Regions;
DenseMap<MDNode *, Region *> MDNToRegion;
auto &Ctx = F.getContext();
for (BasicBlock &BB : F) {
for (Instruction &Inst : BB) {
if (auto *MDN = cast<llvm::Instruction>(Inst.Val)->getMetadata(MDKind)) {
Region *R = nullptr;
auto It = MDNToRegion.find(MDN);
if (It == MDNToRegion.end()) {
Regions.push_back(std::make_unique<Region>(Ctx, TTI));
R = Regions.back().get();
MDNToRegion[MDN] = R;
} else {
R = It->second;
}
R->add(&Inst);
}
}
}
return Regions;
}
} // namespace llvm::sandboxir
|
