AssumeBundleQueries.cpp
7.96 KB
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
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
//===- AssumeBundleQueries.cpp - tool to query assume bundles ---*- C++ -*-===//
//
// 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
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "assume-queries"
#include "llvm/Analysis/AssumeBundleQueries.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InstIterator.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/Support/DebugCounter.h"
using namespace llvm;
using namespace llvm::PatternMatch;
STATISTIC(NumAssumeQueries, "Number of Queries into an assume assume bundles");
STATISTIC(
NumUsefullAssumeQueries,
"Number of Queries into an assume assume bundles that were satisfied");
DEBUG_COUNTER(AssumeQueryCounter, "assume-queries-counter",
"Controls which assumes gets created");
static bool bundleHasArgument(const CallBase::BundleOpInfo &BOI, unsigned Idx) {
return BOI.End - BOI.Begin > Idx;
}
static Value *getValueFromBundleOpInfo(CallInst &Assume,
const CallBase::BundleOpInfo &BOI,
unsigned Idx) {
assert(bundleHasArgument(BOI, Idx) && "index out of range");
return (Assume.op_begin() + BOI.Begin + Idx)->get();
}
bool llvm::hasAttributeInAssume(CallInst &AssumeCI, Value *IsOn,
StringRef AttrName, uint64_t *ArgVal) {
assert(isa<IntrinsicInst>(AssumeCI) &&
"this function is intended to be used on llvm.assume");
IntrinsicInst &Assume = cast<IntrinsicInst>(AssumeCI);
assert(Assume.getIntrinsicID() == Intrinsic::assume &&
"this function is intended to be used on llvm.assume");
assert(Attribute::isExistingAttribute(AttrName) &&
"this attribute doesn't exist");
assert((ArgVal == nullptr || Attribute::doesAttrKindHaveArgument(
Attribute::getAttrKindFromName(AttrName))) &&
"requested value for an attribute that has no argument");
if (Assume.bundle_op_infos().empty())
return false;
for (auto &BOI : Assume.bundle_op_infos()) {
if (BOI.Tag->getKey() != AttrName)
continue;
if (IsOn && (BOI.End - BOI.Begin <= ABA_WasOn ||
IsOn != getValueFromBundleOpInfo(Assume, BOI, ABA_WasOn)))
continue;
if (ArgVal) {
assert(BOI.End - BOI.Begin > ABA_Argument);
*ArgVal =
cast<ConstantInt>(getValueFromBundleOpInfo(Assume, BOI, ABA_Argument))
->getZExtValue();
}
return true;
}
return false;
}
void llvm::fillMapFromAssume(CallInst &AssumeCI, RetainedKnowledgeMap &Result) {
IntrinsicInst &Assume = cast<IntrinsicInst>(AssumeCI);
assert(Assume.getIntrinsicID() == Intrinsic::assume &&
"this function is intended to be used on llvm.assume");
for (auto &Bundles : Assume.bundle_op_infos()) {
std::pair<Value *, Attribute::AttrKind> Key{
nullptr, Attribute::getAttrKindFromName(Bundles.Tag->getKey())};
if (bundleHasArgument(Bundles, ABA_WasOn))
Key.first = getValueFromBundleOpInfo(Assume, Bundles, ABA_WasOn);
if (Key.first == nullptr && Key.second == Attribute::None)
continue;
if (!bundleHasArgument(Bundles, ABA_Argument)) {
Result[Key][&Assume] = {0, 0};
continue;
}
unsigned Val = cast<ConstantInt>(
getValueFromBundleOpInfo(Assume, Bundles, ABA_Argument))
->getZExtValue();
auto Lookup = Result.find(Key);
if (Lookup == Result.end() || !Lookup->second.count(&Assume)) {
Result[Key][&Assume] = {Val, Val};
continue;
}
Lookup->second[&Assume].Min = std::min(Val, Lookup->second[&Assume].Min);
Lookup->second[&Assume].Max = std::max(Val, Lookup->second[&Assume].Max);
}
}
RetainedKnowledge
llvm::getKnowledgeFromBundle(CallInst &Assume,
const CallBase::BundleOpInfo &BOI) {
RetainedKnowledge Result;
Result.AttrKind = Attribute::getAttrKindFromName(BOI.Tag->getKey());
if (bundleHasArgument(BOI, ABA_WasOn))
Result.WasOn = getValueFromBundleOpInfo(Assume, BOI, ABA_WasOn);
if (BOI.End - BOI.Begin > ABA_Argument)
Result.ArgValue =
cast<ConstantInt>(getValueFromBundleOpInfo(Assume, BOI, ABA_Argument))
->getZExtValue();
return Result;
}
RetainedKnowledge llvm::getKnowledgeFromOperandInAssume(CallInst &AssumeCI,
unsigned Idx) {
IntrinsicInst &Assume = cast<IntrinsicInst>(AssumeCI);
assert(Assume.getIntrinsicID() == Intrinsic::assume &&
"this function is intended to be used on llvm.assume");
CallBase::BundleOpInfo BOI = Assume.getBundleOpInfoForOperand(Idx);
return getKnowledgeFromBundle(AssumeCI, BOI);
}
bool llvm::isAssumeWithEmptyBundle(CallInst &CI) {
IntrinsicInst &Assume = cast<IntrinsicInst>(CI);
assert(Assume.getIntrinsicID() == Intrinsic::assume &&
"this function is intended to be used on llvm.assume");
return none_of(Assume.bundle_op_infos(),
[](const CallBase::BundleOpInfo &BOI) {
return BOI.Tag->getKey() != IgnoreBundleTag;
});
}
static CallInst::BundleOpInfo *getBundleFromUse(const Use *U) {
auto *Intr = dyn_cast<IntrinsicInst>(U->getUser());
if (!match(U->getUser(),
m_Intrinsic<Intrinsic::assume>(m_Unless(m_Specific(U->get())))))
return nullptr;
return &Intr->getBundleOpInfoForOperand(U->getOperandNo());
}
RetainedKnowledge
llvm::getKnowledgeFromUse(const Use *U,
ArrayRef<Attribute::AttrKind> AttrKinds) {
CallInst::BundleOpInfo* Bundle = getBundleFromUse(U);
if (!Bundle)
return RetainedKnowledge::none();
RetainedKnowledge RK =
getKnowledgeFromBundle(*cast<CallInst>(U->getUser()), *Bundle);
for (auto Attr : AttrKinds)
if (Attr == RK.AttrKind)
return RK;
return RetainedKnowledge::none();
}
RetainedKnowledge
llvm::getKnowledgeForValue(const Value *V,
ArrayRef<Attribute::AttrKind> AttrKinds,
AssumptionCache *AC,
function_ref<bool(RetainedKnowledge, Instruction *,
const CallBase::BundleOpInfo *)>
Filter) {
NumAssumeQueries++;
if (!DebugCounter::shouldExecute(AssumeQueryCounter))
return RetainedKnowledge::none();
if (AC) {
for (AssumptionCache::ResultElem &Elem : AC->assumptionsFor(V)) {
IntrinsicInst *II = cast_or_null<IntrinsicInst>(Elem.Assume);
if (!II || Elem.Index == AssumptionCache::ExprResultIdx)
continue;
if (RetainedKnowledge RK = getKnowledgeFromBundle(
*II, II->bundle_op_info_begin()[Elem.Index]))
if (is_contained(AttrKinds, RK.AttrKind) &&
Filter(RK, II, &II->bundle_op_info_begin()[Elem.Index])) {
NumUsefullAssumeQueries++;
return RK;
}
}
return RetainedKnowledge::none();
}
for (const auto &U : V->uses()) {
CallInst::BundleOpInfo* Bundle = getBundleFromUse(&U);
if (!Bundle)
continue;
if (RetainedKnowledge RK =
getKnowledgeFromBundle(*cast<CallInst>(U.getUser()), *Bundle))
if (is_contained(AttrKinds, RK.AttrKind) &&
Filter(RK, cast<Instruction>(U.getUser()), Bundle)) {
NumUsefullAssumeQueries++;
return RK;
}
}
return RetainedKnowledge::none();
}
RetainedKnowledge llvm::getKnowledgeValidInContext(
const Value *V, ArrayRef<Attribute::AttrKind> AttrKinds,
const Instruction *CtxI, const DominatorTree *DT, AssumptionCache *AC) {
return getKnowledgeForValue(V, AttrKinds, AC,
[&](auto, Instruction *I, auto) {
return isValidAssumeForContext(I, CtxI, DT);
});
}