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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
|
//===- CodeExtractor.cpp - Unit tests for CodeExtractor -------------------===//
//
// 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/Transforms/Utils/CodeExtractor.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/Verifier.h"
#include "llvm/IRReader/IRReader.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
BasicBlock *getBlockByName(Function *F, StringRef name) {
for (auto &BB : *F)
if (BB.getName() == name)
return &BB;
return nullptr;
}
TEST(CodeExtractor, ExitStub) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"invalid(
define i32 @foo(i32 %x, i32 %y, i32 %z) {
header:
%0 = icmp ugt i32 %x, %y
br i1 %0, label %body1, label %body2
body1:
%1 = add i32 %z, 2
br label %notExtracted
body2:
%2 = mul i32 %z, 7
br label %notExtracted
notExtracted:
%3 = phi i32 [ %1, %body1 ], [ %2, %body2 ]
%4 = add i32 %3, %x
ret i32 %4
}
)invalid",
Err, Ctx));
Function *Func = M->getFunction("foo");
SmallVector<BasicBlock *, 3> Candidates{ getBlockByName(Func, "header"),
getBlockByName(Func, "body1"),
getBlockByName(Func, "body2") };
CodeExtractor CE(Candidates);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
BasicBlock *Exit = getBlockByName(Func, "notExtracted");
BasicBlock *ExitSplit = getBlockByName(Outlined, "notExtracted.split");
// Ensure that PHI in exit block has only one incoming value (from code
// replacer block).
EXPECT_TRUE(Exit && cast<PHINode>(Exit->front()).getNumIncomingValues() == 1);
// Ensure that there is a PHI in outlined function with 2 incoming values.
EXPECT_TRUE(ExitSplit &&
cast<PHINode>(ExitSplit->front()).getNumIncomingValues() == 2);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
}
TEST(CodeExtractor, ExitPHIOnePredFromRegion) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"invalid(
define i32 @foo() {
header:
br i1 undef, label %extracted1, label %pred
pred:
br i1 undef, label %exit1, label %exit2
extracted1:
br i1 undef, label %extracted2, label %exit1
extracted2:
br label %exit2
exit1:
%0 = phi i32 [ 1, %extracted1 ], [ 2, %pred ]
ret i32 %0
exit2:
%1 = phi i32 [ 3, %extracted2 ], [ 4, %pred ]
ret i32 %1
}
)invalid", Err, Ctx));
Function *Func = M->getFunction("foo");
SmallVector<BasicBlock *, 2> ExtractedBlocks{
getBlockByName(Func, "extracted1"),
getBlockByName(Func, "extracted2")
};
CodeExtractor CE(ExtractedBlocks);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
BasicBlock *Exit1 = getBlockByName(Func, "exit1");
BasicBlock *Exit2 = getBlockByName(Func, "exit2");
// Ensure that PHIs in exits are not splitted (since that they have only one
// incoming value from extracted region).
EXPECT_TRUE(Exit1 &&
cast<PHINode>(Exit1->front()).getNumIncomingValues() == 2);
EXPECT_TRUE(Exit2 &&
cast<PHINode>(Exit2->front()).getNumIncomingValues() == 2);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
}
TEST(CodeExtractor, StoreOutputInvokeResultAfterEHPad) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"invalid(
declare i8 @hoge()
define i32 @foo() personality i8* null {
entry:
%call = invoke i8 @hoge()
to label %invoke.cont unwind label %lpad
invoke.cont: ; preds = %entry
unreachable
lpad: ; preds = %entry
%0 = landingpad { i8*, i32 }
catch i8* null
br i1 undef, label %catch, label %finally.catchall
catch: ; preds = %lpad
%call2 = invoke i8 @hoge()
to label %invoke.cont2 unwind label %lpad2
invoke.cont2: ; preds = %catch
%call3 = invoke i8 @hoge()
to label %invoke.cont3 unwind label %lpad2
invoke.cont3: ; preds = %invoke.cont2
unreachable
lpad2: ; preds = %invoke.cont2, %catch
%ex.1 = phi i8* [ undef, %invoke.cont2 ], [ null, %catch ]
%1 = landingpad { i8*, i32 }
catch i8* null
br label %finally.catchall
finally.catchall: ; preds = %lpad33, %lpad
%ex.2 = phi i8* [ %ex.1, %lpad2 ], [ null, %lpad ]
unreachable
}
)invalid", Err, Ctx));
if (!M) {
Err.print("unit", errs());
exit(1);
}
Function *Func = M->getFunction("foo");
EXPECT_FALSE(verifyFunction(*Func, &errs()));
SmallVector<BasicBlock *, 2> ExtractedBlocks{
getBlockByName(Func, "catch"),
getBlockByName(Func, "invoke.cont2"),
getBlockByName(Func, "invoke.cont3"),
getBlockByName(Func, "lpad2")
};
CodeExtractor CE(ExtractedBlocks);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
EXPECT_FALSE(verifyFunction(*Outlined, &errs()));
EXPECT_FALSE(verifyFunction(*Func, &errs()));
}
TEST(CodeExtractor, StoreOutputInvokeResultInExitStub) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"invalid(
declare i32 @bar()
define i32 @foo() personality i8* null {
entry:
%0 = invoke i32 @bar() to label %exit unwind label %lpad
exit:
ret i32 %0
lpad:
%1 = landingpad { i8*, i32 }
cleanup
resume { i8*, i32 } %1
}
)invalid",
Err, Ctx));
Function *Func = M->getFunction("foo");
SmallVector<BasicBlock *, 1> Blocks{ getBlockByName(Func, "entry"),
getBlockByName(Func, "lpad") };
CodeExtractor CE(Blocks);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
}
TEST(CodeExtractor, ExtractAndInvalidateAssumptionCache) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"ir(
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64"
%b = type { i64 }
declare void @g(i8*)
declare void @llvm.assume(i1) #0
define void @test() {
entry:
br label %label
label:
%0 = load %b*, %b** inttoptr (i64 8 to %b**), align 8
%1 = getelementptr inbounds %b, %b* %0, i64 undef, i32 0
%2 = load i64, i64* %1, align 8
%3 = icmp ugt i64 %2, 1
br i1 %3, label %if.then, label %if.else
if.then:
unreachable
if.else:
call void @g(i8* undef)
store i64 undef, i64* null, align 536870912
%4 = icmp eq i64 %2, 0
call void @llvm.assume(i1 %4)
unreachable
}
attributes #0 = { nounwind willreturn }
)ir",
Err, Ctx));
assert(M && "Could not parse module?");
Function *Func = M->getFunction("test");
SmallVector<BasicBlock *, 1> Blocks{ getBlockByName(Func, "if.else") };
AssumptionCache AC(*Func);
CodeExtractor CE(Blocks, nullptr, false, nullptr, nullptr, &AC);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
EXPECT_FALSE(CE.verifyAssumptionCache(*Func, *Outlined, &AC));
}
TEST(CodeExtractor, RemoveBitcastUsesFromOuterLifetimeMarkers) {
LLVMContext Ctx;
SMDiagnostic Err;
std::unique_ptr<Module> M(parseAssemblyString(R"ir(
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare void @use(i32*)
declare void @llvm.lifetime.start.p0i8(i64, i8*)
declare void @llvm.lifetime.end.p0i8(i64, i8*)
define void @foo() {
entry:
%0 = alloca i32
br label %extract
extract:
%1 = bitcast i32* %0 to i8*
call void @llvm.lifetime.start.p0i8(i64 4, i8* %1)
call void @use(i32* %0)
br label %exit
exit:
call void @use(i32* %0)
call void @llvm.lifetime.end.p0i8(i64 4, i8* %1)
ret void
}
)ir",
Err, Ctx));
Function *Func = M->getFunction("foo");
SmallVector<BasicBlock *, 1> Blocks{getBlockByName(Func, "extract")};
CodeExtractor CE(Blocks);
EXPECT_TRUE(CE.isEligible());
CodeExtractorAnalysisCache CEAC(*Func);
SetVector<Value *> Inputs, Outputs, SinkingCands, HoistingCands;
BasicBlock *CommonExit = nullptr;
CE.findAllocas(CEAC, SinkingCands, HoistingCands, CommonExit);
CE.findInputsOutputs(Inputs, Outputs, SinkingCands);
EXPECT_EQ(Outputs.size(), 0U);
Function *Outlined = CE.extractCodeRegion(CEAC);
EXPECT_TRUE(Outlined);
EXPECT_FALSE(verifyFunction(*Outlined));
EXPECT_FALSE(verifyFunction(*Func));
}
} // end anonymous namespace
|
