-
Notifications
You must be signed in to change notification settings - Fork 10.8k
/
nsw.ll
444 lines (397 loc) · 24 KB
/
nsw.ll
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
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt < %s -disable-output "-passes=print<scalar-evolution>" 2>&1 | FileCheck %s
; The addrecs in this loop are analyzable only by using nsw information.
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64"
define void @test1(ptr %p) nounwind {
; CHECK-LABEL: 'test1'
; CHECK-NEXT: Classifying expressions for: @test1
; CHECK-NEXT: %i.01 = phi i32 [ %tmp8, %bb1 ], [ 0, %bb.nph ]
; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%bb> U: [0,-2147483648) S: [0,-2147483648) Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %tmp2 = sext i32 %i.01 to i64
; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%bb> U: [0,-9223372036854775808) S: [0,-9223372036854775808) Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %tmp3 = getelementptr double, ptr %p, i64 %tmp2
; CHECK-NEXT: --> {%p,+,8}<%bb> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %tmp6 = sext i32 %i.01 to i64
; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%bb> U: [0,-9223372036854775808) S: [0,-9223372036854775808) Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %tmp7 = getelementptr double, ptr %p, i64 %tmp6
; CHECK-NEXT: --> {%p,+,8}<%bb> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %tmp8 = add nsw i32 %i.01, 1
; CHECK-NEXT: --> {1,+,1}<nuw><nsw><%bb> U: [1,-2147483648) S: [1,-2147483648) Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %p.gep = getelementptr double, ptr %p, i32 %tmp8
; CHECK-NEXT: --> {(8 + %p),+,8}<%bb> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %phitmp = sext i32 %tmp8 to i64
; CHECK-NEXT: --> {1,+,1}<nuw><nsw><%bb> U: [1,-9223372036854775808) S: [1,-9223372036854775808) Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: %tmp9 = getelementptr inbounds double, ptr %p, i64 %phitmp
; CHECK-NEXT: --> {(8 + %p),+,8}<%bb> U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %bb: Computable }
; CHECK-NEXT: Determining loop execution counts for: @test1
; CHECK-NEXT: Loop %bb: Unpredictable backedge-taken count.
; CHECK-NEXT: Loop %bb: Unpredictable constant max backedge-taken count.
; CHECK-NEXT: Loop %bb: Unpredictable symbolic max backedge-taken count.
; CHECK-NEXT: Loop %bb: Unpredictable predicated backedge-taken count.
;
entry:
%tmp = load double, ptr %p, align 8 ; <double> [#uses=1]
%tmp1 = fcmp ogt double %tmp, 2.000000e+00 ; <i1> [#uses=1]
br i1 %tmp1, label %bb.nph, label %return
bb.nph: ; preds = %entry
br label %bb
bb: ; preds = %bb1, %bb.nph
%i.01 = phi i32 [ %tmp8, %bb1 ], [ 0, %bb.nph ] ; <i32> [#uses=3]
%tmp2 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
%tmp3 = getelementptr double, ptr %p, i64 %tmp2 ; <ptr> [#uses=1]
%tmp4 = load double, ptr %tmp3, align 8 ; <double> [#uses=1]
%tmp5 = fmul double %tmp4, 9.200000e+00 ; <double> [#uses=1]
%tmp6 = sext i32 %i.01 to i64 ; <i64> [#uses=1]
%tmp7 = getelementptr double, ptr %p, i64 %tmp6 ; <ptr> [#uses=1]
store double %tmp5, ptr %tmp7, align 8
%tmp8 = add nsw i32 %i.01, 1 ; <i32> [#uses=2]
%p.gep = getelementptr double, ptr %p, i32 %tmp8
%p.val = load double, ptr %p.gep
br label %bb1
bb1: ; preds = %bb
%phitmp = sext i32 %tmp8 to i64 ; <i64> [#uses=1]
%tmp9 = getelementptr inbounds double, ptr %p, i64 %phitmp ; <ptr> [#uses=1]
%tmp10 = load double, ptr %tmp9, align 8 ; <double> [#uses=1]
%tmp11 = fcmp ogt double %tmp10, 2.000000e+00 ; <i1> [#uses=1]
br i1 %tmp11, label %bb, label %bb1.return_crit_edge
bb1.return_crit_edge: ; preds = %bb1
br label %return
return: ; preds = %bb1.return_crit_edge, %entry
ret void
}
define void @test2(ptr %begin, ptr %end) ssp {
; CHECK-LABEL: 'test2'
; CHECK-NEXT: Classifying expressions for: @test2
; CHECK-NEXT: %__first.addr.02.i.i = phi ptr [ %begin, %for.body.lr.ph.i.i ], [ %ptrincdec.i.i, %for.body.i.i ]
; CHECK-NEXT: --> {%begin,+,4}<nuw><%for.body.i.i> U: full-set S: full-set Exits: ((4 * ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4))<nuw> + %begin) LoopDispositions: { %for.body.i.i: Computable }
; CHECK-NEXT: %ptrincdec.i.i = getelementptr inbounds i32, ptr %__first.addr.02.i.i, i64 1
; CHECK-NEXT: --> {(4 + %begin),+,4}<nuw><%for.body.i.i> U: full-set S: full-set Exits: (4 + (4 * ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4))<nuw> + %begin) LoopDispositions: { %for.body.i.i: Computable }
; CHECK-NEXT: Determining loop execution counts for: @test2
; CHECK-NEXT: Loop %for.body.i.i: backedge-taken count is ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4)
; CHECK-NEXT: Loop %for.body.i.i: constant max backedge-taken count is 4611686018427387903
; CHECK-NEXT: Loop %for.body.i.i: symbolic max backedge-taken count is ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4)
; CHECK-NEXT: Loop %for.body.i.i: Predicated backedge-taken count is ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4)
; CHECK-NEXT: Predicates:
; CHECK: Loop %for.body.i.i: Trip multiple is 1
;
entry:
%cmp1.i.i = icmp eq ptr %begin, %end
br i1 %cmp1.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.lr.ph.i.i
for.body.lr.ph.i.i: ; preds = %entry
br label %for.body.i.i
for.body.i.i: ; preds = %for.body.i.i, %for.body.lr.ph.i.i
%__first.addr.02.i.i = phi ptr [ %begin, %for.body.lr.ph.i.i ], [ %ptrincdec.i.i, %for.body.i.i ]
store i32 0, ptr %__first.addr.02.i.i, align 4
%ptrincdec.i.i = getelementptr inbounds i32, ptr %__first.addr.02.i.i, i64 1
%cmp.i.i = icmp eq ptr %ptrincdec.i.i, %end
br i1 %cmp.i.i, label %for.cond.for.end_crit_edge.i.i, label %for.body.i.i
for.cond.for.end_crit_edge.i.i: ; preds = %for.body.i.i
br label %_ZSt4fillIPiiEvT_S1_RKT0_.exit
_ZSt4fillIPiiEvT_S1_RKT0_.exit: ; preds = %entry, %for.cond.for.end_crit_edge.i.i
ret void
}
; Various checks for inbounds geps.
define void @test3(ptr %begin, ptr %end) nounwind ssp {
; CHECK-LABEL: 'test3'
; CHECK-NEXT: Classifying expressions for: @test3
; CHECK-NEXT: %indvar.i.i = phi i64 [ %tmp, %for.body.i.i ], [ 0, %entry ]
; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%for.body.i.i> U: [0,4611686018427387904) S: [0,4611686018427387904) Exits: ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4) LoopDispositions: { %for.body.i.i: Computable }
; CHECK-NEXT: %tmp = add nsw i64 %indvar.i.i, 1
; CHECK-NEXT: --> {1,+,1}<nuw><nsw><%for.body.i.i> U: [1,4611686018427387905) S: [1,4611686018427387905) Exits: (1 + ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4))<nuw><nsw> LoopDispositions: { %for.body.i.i: Computable }
; CHECK-NEXT: %ptrincdec.i.i = getelementptr inbounds i32, ptr %begin, i64 %tmp
; CHECK-NEXT: --> {(4 + %begin),+,4}<nuw><%for.body.i.i> U: full-set S: full-set Exits: (4 + (4 * ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4))<nuw> + %begin) LoopDispositions: { %for.body.i.i: Computable }
; CHECK-NEXT: %__first.addr.08.i.i = getelementptr inbounds i32, ptr %begin, i64 %indvar.i.i
; CHECK-NEXT: --> {%begin,+,4}<nuw><%for.body.i.i> U: full-set S: full-set Exits: ((4 * ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4))<nuw> + %begin) LoopDispositions: { %for.body.i.i: Computable }
; CHECK-NEXT: Determining loop execution counts for: @test3
; CHECK-NEXT: Loop %for.body.i.i: backedge-taken count is ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4)
; CHECK-NEXT: Loop %for.body.i.i: constant max backedge-taken count is 4611686018427387903
; CHECK-NEXT: Loop %for.body.i.i: symbolic max backedge-taken count is ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4)
; CHECK-NEXT: Loop %for.body.i.i: Predicated backedge-taken count is ((-4 + (-1 * (ptrtoint ptr %begin to i64)) + (ptrtoint ptr %end to i64)) /u 4)
; CHECK-NEXT: Predicates:
; CHECK: Loop %for.body.i.i: Trip multiple is 1
;
entry:
%cmp7.i.i = icmp eq ptr %begin, %end
br i1 %cmp7.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.i.i
for.body.i.i: ; preds = %entry, %for.body.i.i
%indvar.i.i = phi i64 [ %tmp, %for.body.i.i ], [ 0, %entry ]
%tmp = add nsw i64 %indvar.i.i, 1
%ptrincdec.i.i = getelementptr inbounds i32, ptr %begin, i64 %tmp
%__first.addr.08.i.i = getelementptr inbounds i32, ptr %begin, i64 %indvar.i.i
store i32 0, ptr %__first.addr.08.i.i, align 4
%cmp.i.i = icmp eq ptr %ptrincdec.i.i, %end
br i1 %cmp.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.i.i
_ZSt4fillIPiiEvT_S1_RKT0_.exit: ; preds = %for.body.i.i, %entry
ret void
}
; A single AddExpr exists for (%a + %b), which is not always <nsw>.
define i32 @addnsw(i32 %a, i32 %b) nounwind ssp {
; CHECK-LABEL: 'addnsw'
; CHECK-NEXT: Classifying expressions for: @addnsw
; CHECK-NEXT: %tmp = add i32 %a, %b
; CHECK-NEXT: --> (%a + %b) U: full-set S: full-set
; CHECK-NEXT: %tmp2 = add nsw i32 %a, %b
; CHECK-NEXT: --> (%a + %b) U: full-set S: full-set
; CHECK-NEXT: %result = phi i32 [ %a, %entry ], [ %tmp2, %greater ]
; CHECK-NEXT: --> %result U: full-set S: full-set
; CHECK-NEXT: Determining loop execution counts for: @addnsw
;
entry:
%tmp = add i32 %a, %b
%cmp = icmp sgt i32 %tmp, 0
br i1 %cmp, label %greater, label %exit
greater:
%tmp2 = add nsw i32 %a, %b
br label %exit
exit:
%result = phi i32 [ %a, %entry ], [ %tmp2, %greater ]
ret i32 %result
}
define i32 @PR12375(ptr readnone %arg) {
; CHECK-LABEL: 'PR12375'
; CHECK-NEXT: Classifying expressions for: @PR12375
; CHECK-NEXT: %tmp = getelementptr inbounds i32, ptr %arg, i64 2
; CHECK-NEXT: --> (8 + %arg)<nuw> U: [8,0) S: [8,0)
; CHECK-NEXT: %tmp2 = phi ptr [ %arg, %bb ], [ %tmp5, %bb1 ]
; CHECK-NEXT: --> {%arg,+,4}<nuw><%bb1> U: full-set S: full-set Exits: (4 + %arg)<nuw> LoopDispositions: { %bb1: Computable }
; CHECK-NEXT: %tmp3 = phi i32 [ 0, %bb ], [ %tmp4, %bb1 ]
; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%bb1> U: [0,2) S: [0,2) Exits: 1 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT: %tmp4 = add nsw i32 %tmp3, 1
; CHECK-NEXT: --> {1,+,1}<nuw><nsw><%bb1> U: [1,3) S: [1,3) Exits: 2 LoopDispositions: { %bb1: Computable }
; CHECK-NEXT: %tmp5 = getelementptr inbounds i32, ptr %tmp2, i64 1
; CHECK-NEXT: --> {(4 + %arg)<nuw>,+,4}<nuw><%bb1> U: [4,0) S: [4,0) Exits: (8 + %arg)<nuw> LoopDispositions: { %bb1: Computable }
; CHECK-NEXT: Determining loop execution counts for: @PR12375
; CHECK-NEXT: Loop %bb1: backedge-taken count is 1
; CHECK-NEXT: Loop %bb1: constant max backedge-taken count is 1
; CHECK-NEXT: Loop %bb1: symbolic max backedge-taken count is 1
; CHECK-NEXT: Loop %bb1: Predicated backedge-taken count is 1
; CHECK-NEXT: Predicates:
; CHECK: Loop %bb1: Trip multiple is 2
;
bb:
%tmp = getelementptr inbounds i32, ptr %arg, i64 2
br label %bb1
bb1: ; preds = %bb1, %bb
%tmp2 = phi ptr [ %arg, %bb ], [ %tmp5, %bb1 ]
%tmp3 = phi i32 [ 0, %bb ], [ %tmp4, %bb1 ]
%tmp4 = add nsw i32 %tmp3, 1
%tmp5 = getelementptr inbounds i32, ptr %tmp2, i64 1
%tmp6 = icmp ult ptr %tmp5, %tmp
br i1 %tmp6, label %bb1, label %bb7
bb7: ; preds = %bb1
ret i32 %tmp4
}
define void @PR12376(ptr nocapture %arg, ptr nocapture %arg1) {
; CHECK-LABEL: 'PR12376'
; CHECK-NEXT: Classifying expressions for: @PR12376
; CHECK-NEXT: %tmp = phi ptr [ %arg, %bb ], [ %tmp4, %bb2 ]
; CHECK-NEXT: --> {%arg,+,4}<nuw><%bb2> U: full-set S: full-set Exits: ((4 * ((-1 + (-1 * (ptrtoint ptr %arg to i64)) + ((4 + (ptrtoint ptr %arg to i64))<nuw> umax (ptrtoint ptr %arg1 to i64))) /u 4))<nuw> + %arg) LoopDispositions: { %bb2: Computable }
; CHECK-NEXT: %tmp4 = getelementptr inbounds i32, ptr %tmp, i64 1
; CHECK-NEXT: --> {(4 + %arg)<nuw>,+,4}<nuw><%bb2> U: [4,0) S: [4,0) Exits: (4 + (4 * ((-1 + (-1 * (ptrtoint ptr %arg to i64)) + ((4 + (ptrtoint ptr %arg to i64))<nuw> umax (ptrtoint ptr %arg1 to i64))) /u 4))<nuw> + %arg) LoopDispositions: { %bb2: Computable }
; CHECK-NEXT: Determining loop execution counts for: @PR12376
; CHECK-NEXT: Loop %bb2: backedge-taken count is ((-1 + (-1 * (ptrtoint ptr %arg to i64)) + ((4 + (ptrtoint ptr %arg to i64))<nuw> umax (ptrtoint ptr %arg1 to i64))) /u 4)
; CHECK-NEXT: Loop %bb2: constant max backedge-taken count is 4611686018427387902
; CHECK-NEXT: Loop %bb2: symbolic max backedge-taken count is ((-1 + (-1 * (ptrtoint ptr %arg to i64)) + ((4 + (ptrtoint ptr %arg to i64))<nuw> umax (ptrtoint ptr %arg1 to i64))) /u 4)
; CHECK-NEXT: Loop %bb2: Predicated backedge-taken count is ((-1 + (-1 * (ptrtoint ptr %arg to i64)) + ((4 + (ptrtoint ptr %arg to i64))<nuw> umax (ptrtoint ptr %arg1 to i64))) /u 4)
; CHECK-NEXT: Predicates:
; CHECK: Loop %bb2: Trip multiple is 1
;
bb:
br label %bb2
bb2: ; preds = %bb2, %bb
%tmp = phi ptr [ %arg, %bb ], [ %tmp4, %bb2 ]
%tmp4 = getelementptr inbounds i32, ptr %tmp, i64 1
%tmp3 = icmp ult ptr %tmp4, %arg1
br i1 %tmp3, label %bb2, label %bb5
bb5: ; preds = %bb2
ret void
}
declare void @f(i32)
define void @nswnowrap(i32 %v, ptr %buf) {
; CHECK-LABEL: 'nswnowrap'
; CHECK-NEXT: Classifying expressions for: @nswnowrap
; CHECK-NEXT: %add = add nsw i32 %v, 1
; CHECK-NEXT: --> (1 + %v) U: full-set S: full-set
; CHECK-NEXT: %i.04 = phi i32 [ %v, %entry ], [ %inc, %for.body ]
; CHECK-NEXT: --> {%v,+,1}<nsw><%for.body> U: full-set S: full-set Exits: ((1 + %v) smax %v) LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %inc = add nsw i32 %i.04, 1
; CHECK-NEXT: --> {(1 + %v)<nsw>,+,1}<nsw><%for.body> U: full-set S: full-set Exits: (1 + ((1 + %v)<nsw> smax %v)) LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %buf.gep = getelementptr inbounds i32, ptr %buf, i32 %inc
; CHECK-NEXT: --> {(4 + (4 * (sext i32 %v to i64))<nsw> + %buf),+,4}<nw><%for.body> U: full-set S: full-set Exits: (4 + (4 * (zext i32 ((-1 * %v) + ((1 + %v)<nsw> smax %v)) to i64))<nuw><nsw> + (4 * (sext i32 %v to i64))<nsw> + %buf) LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %buf.val = load i32, ptr %buf.gep, align 4
; CHECK-NEXT: --> %buf.val U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.body: Variant }
; CHECK-NEXT: Determining loop execution counts for: @nswnowrap
; CHECK-NEXT: Loop %for.body: backedge-taken count is ((-1 * %v) + ((1 + %v)<nsw> smax %v))
; CHECK-NEXT: Loop %for.body: constant max backedge-taken count is 1, actual taken count either this or zero.
; CHECK-NEXT: Loop %for.body: symbolic max backedge-taken count is ((-1 * %v) + ((1 + %v)<nsw> smax %v)), actual taken count either this or zero.
; CHECK-NEXT: Loop %for.body: Predicated backedge-taken count is ((-1 * %v) + ((1 + %v)<nsw> smax %v))
; CHECK-NEXT: Predicates:
; CHECK: Loop %for.body: Trip multiple is 1
;
entry:
%add = add nsw i32 %v, 1
br label %for.body
for.body:
%i.04 = phi i32 [ %v, %entry ], [ %inc, %for.body ]
%inc = add nsw i32 %i.04, 1
%buf.gep = getelementptr inbounds i32, ptr %buf, i32 %inc
%buf.val = load i32, ptr %buf.gep
%cmp = icmp slt i32 %i.04, %add
tail call void @f(i32 %i.04)
br i1 %cmp, label %for.body, label %for.end
for.end:
ret void
}
; This test checks if no-wrap flags are propagated when folding {S,+,X}+T ==> {S+T,+,X}
define void @test4(i32 %arg) {
; CHECK-LABEL: 'test4'
; CHECK-NEXT: Classifying expressions for: @test4
; CHECK-NEXT: %array = alloca [10 x i32], align 4
; CHECK-NEXT: --> %array U: [0,-43) S: [-9223372036854775808,9223372036854775805)
; CHECK-NEXT: %index = phi i32 [ %inc5, %for.body ], [ %arg, %entry ]
; CHECK-NEXT: --> {%arg,+,1}<nsw><%for.body> U: full-set S: full-set Exits: (-1 + (10 smax (1 + %arg)<nsw>))<nsw> LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %sub = add nsw i32 %index, -2
; CHECK-NEXT: --> {(-2 + %arg)<nsw>,+,1}<nsw><%for.body> U: full-set S: full-set Exits: (-3 + (10 smax (1 + %arg)<nsw>))<nsw> LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %idxprom = sext i32 %sub to i64
; CHECK-NEXT: --> {(-2 + (sext i32 %arg to i64))<nsw>,+,1}<nsw><%for.body> U: [-2147483650,4294967303) S: [-2147483650,4294967303) Exits: (-2 + (zext i32 (-1 + (-1 * %arg) + (10 smax (1 + %arg)<nsw>)) to i64) + (sext i32 %arg to i64)) LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %arrayidx = getelementptr inbounds [10 x i32], ptr %array, i64 0, i64 %idxprom
; CHECK-NEXT: --> {(-8 + (4 * (sext i32 %arg to i64))<nsw> + %array),+,4}<nw><%for.body> U: [0,-3) S: [-9223372036854775808,9223372036854775805) Exits: (-8 + (4 * (zext i32 (-1 + (-1 * %arg) + (10 smax (1 + %arg)<nsw>)) to i64))<nuw><nsw> + (4 * (sext i32 %arg to i64))<nsw> + %array) LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: %data = load i32, ptr %arrayidx, align 4
; CHECK-NEXT: --> %data U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %for.body: Variant }
; CHECK-NEXT: %inc5 = add nsw i32 %index, 1
; CHECK-NEXT: --> {(1 + %arg)<nsw>,+,1}<nsw><%for.body> U: [-2147483647,-2147483648) S: [-2147483647,-2147483648) Exits: (10 smax (1 + %arg)<nsw>) LoopDispositions: { %for.body: Computable }
; CHECK-NEXT: Determining loop execution counts for: @test4
; CHECK-NEXT: Loop %for.body: backedge-taken count is (-1 + (-1 * %arg) + (10 smax (1 + %arg)<nsw>))
; CHECK-NEXT: Loop %for.body: constant max backedge-taken count is -2147483639
; CHECK-NEXT: Loop %for.body: symbolic max backedge-taken count is (-1 + (-1 * %arg) + (10 smax (1 + %arg)<nsw>))
; CHECK-NEXT: Loop %for.body: Predicated backedge-taken count is (-1 + (-1 * %arg) + (10 smax (1 + %arg)<nsw>))
; CHECK-NEXT: Predicates:
; CHECK: Loop %for.body: Trip multiple is 1
;
entry:
%array = alloca [10 x i32], align 4
br label %for.body
for.body:
%index = phi i32 [ %inc5, %for.body ], [ %arg, %entry ]
%sub = add nsw i32 %index, -2
%idxprom = sext i32 %sub to i64
%arrayidx = getelementptr inbounds [10 x i32], ptr %array, i64 0, i64 %idxprom
%data = load i32, ptr %arrayidx, align 4
%inc5 = add nsw i32 %index, 1
%cmp2 = icmp slt i32 %inc5, 10
br i1 %cmp2, label %for.body, label %for.end
for.end:
ret void
}
define void @bad_postinc_nsw_a(i32 %n) {
; CHECK-LABEL: 'bad_postinc_nsw_a'
; CHECK-NEXT: Classifying expressions for: @bad_postinc_nsw_a
; CHECK-NEXT: %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
; CHECK-NEXT: --> {0,+,7}<nuw><nsw><%loop> U: [0,-2147483648) S: [0,-2147483648) Exits: (7 * ((((-1 * (1 umin %n))<nuw><nsw> + %n) /u 7) + (1 umin %n))) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.inc = add nsw i32 %iv, 7
; CHECK-NEXT: --> {7,+,7}<nuw><%loop> U: [7,-3) S: [7,0) Exits: (7 + (7 * ((((-1 * (1 umin %n))<nuw><nsw> + %n) /u 7) + (1 umin %n)))) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: Determining loop execution counts for: @bad_postinc_nsw_a
; CHECK-NEXT: Loop %loop: backedge-taken count is ((((-1 * (1 umin %n))<nuw><nsw> + %n) /u 7) + (1 umin %n))
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is 613566756
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is ((((-1 * (1 umin %n))<nuw><nsw> + %n) /u 7) + (1 umin %n))
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is ((((-1 * (1 umin %n))<nuw><nsw> + %n) /u 7) + (1 umin %n))
; CHECK-NEXT: Predicates:
; CHECK: Loop %loop: Trip multiple is 1
;
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
%iv.inc = add nsw i32 %iv, 7
%becond = icmp ult i32 %iv, %n
br i1 %becond, label %loop, label %leave
leave:
ret void
}
; Unlike @bad_postinc_nsw_a(), the SCEV expression of %iv.inc has <nsw> flag
; because poison can be propagated through 'and %iv.inc, 0'.
define void @postinc_poison_prop_through_and(i32 %n) {
; CHECK-LABEL: 'postinc_poison_prop_through_and'
; CHECK-NEXT: Classifying expressions for: @postinc_poison_prop_through_and
; CHECK-NEXT: %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
; CHECK-NEXT: --> {0,+,7}<nuw><nsw><%loop> U: [0,-2147483648) S: [0,-2147483648) Exits: <<Unknown>> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.inc = add nsw i32 %iv, 7
; CHECK-NEXT: --> {7,+,7}<nuw><nsw><%loop> U: [7,-2147483648) S: [7,-2147483648) Exits: <<Unknown>> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.inc.and = and i32 %iv.inc, 0
; CHECK-NEXT: --> 0 U: [0,1) S: [0,1) Exits: 0 LoopDispositions: { %loop: Invariant }
; CHECK-NEXT: Determining loop execution counts for: @postinc_poison_prop_through_and
; CHECK-NEXT: Loop %loop: Unpredictable backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable constant max backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable symbolic max backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable predicated backedge-taken count.
;
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
%iv.inc = add nsw i32 %iv, 7
%iv.inc.and = and i32 %iv.inc, 0
%becond = icmp ult i32 %iv.inc.and, %n
br i1 %becond, label %loop, label %leave
leave:
ret void
}
declare void @may_exit() nounwind
define void @pr28012(i32 %n) {
; CHECK-LABEL: 'pr28012'
; CHECK-NEXT: Classifying expressions for: @pr28012
; CHECK-NEXT: %iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
; CHECK-NEXT: --> {0,+,7}<nuw><nsw><%loop> U: [0,-2147483648) S: [0,-2147483648) Exits: (7 * ((-1 + (7 umax %n)) /u 7))<nuw> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.inc = add nsw i32 %iv, 7
; CHECK-NEXT: --> {7,+,7}<nuw><%loop> U: [7,-3) S: [7,-3) Exits: (7 + (7 * ((-1 + (7 umax %n)) /u 7))<nuw>) LoopDispositions: { %loop: Computable }
; CHECK-NEXT: Determining loop execution counts for: @pr28012
; CHECK-NEXT: Loop %loop: backedge-taken count is ((-1 + (7 umax %n)) /u 7)
; CHECK-NEXT: Loop %loop: constant max backedge-taken count is 613566755
; CHECK-NEXT: Loop %loop: symbolic max backedge-taken count is ((-1 + (7 umax %n)) /u 7)
; CHECK-NEXT: Loop %loop: Predicated backedge-taken count is ((-1 + (7 umax %n)) /u 7)
; CHECK-NEXT: Predicates:
; CHECK: Loop %loop: Trip multiple is 1
;
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %iv.inc, %loop ]
%iv.inc = add nsw i32 %iv, 7
%becond = icmp ult i32 %iv.inc, %n
call void @may_exit()
br i1 %becond, label %loop, label %leave
leave:
ret void
}
define void @select_cond_poison_propagation(ptr %p, i32 %x) nounwind {
; CHECK-LABEL: 'select_cond_poison_propagation'
; CHECK-NEXT: Classifying expressions for: @select_cond_poison_propagation
; CHECK-NEXT: %iv = phi i32 [ %iv.next, %loop ], [ 0, %entry ]
; CHECK-NEXT: --> {0,+,1}<nuw><nsw><%loop> U: [0,-2147483648) S: [0,-2147483648) Exits: <<Unknown>> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %iv.next = add nsw i32 %iv, 1
; CHECK-NEXT: --> {1,+,1}<nuw><nsw><%loop> U: [1,-2147483648) S: [1,-2147483648) Exits: <<Unknown>> LoopDispositions: { %loop: Computable }
; CHECK-NEXT: %sel = select i1 %cmp, i32 10, i32 20
; CHECK-NEXT: --> %sel U: [0,31) S: [0,31) Exits: <<Unknown>> LoopDispositions: { %loop: Variant }
; CHECK-NEXT: %cond = call i1 @cond()
; CHECK-NEXT: --> %cond U: full-set S: full-set Exits: <<Unknown>> LoopDispositions: { %loop: Variant }
; CHECK-NEXT: Determining loop execution counts for: @select_cond_poison_propagation
; CHECK-NEXT: Loop %loop: Unpredictable backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable constant max backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable symbolic max backedge-taken count.
; CHECK-NEXT: Loop %loop: Unpredictable predicated backedge-taken count.
;
entry:
br label %loop
loop:
%iv = phi i32 [ %iv.next, %loop ], [ 0, %entry ]
%iv.next = add nsw i32 %iv, 1
%cmp = icmp ult i32 %iv.next, %x
%sel = select i1 %cmp, i32 10, i32 20
call void @foo(i32 noundef %sel)
%cond = call i1 @cond()
br i1 %cond, label %loop, label %return
return:
ret void
}
declare void @foo(i32)
declare i1 @cond()