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
|
; RUN: opt < %s -passes=loop-unroll -pragma-unroll-threshold=1024 -S | FileCheck -check-prefixes=CHECK,REM %s
; RUN: opt < %s -passes=loop-unroll,loop-unroll -pragma-unroll-threshold=1024 -S | FileCheck -check-prefixes=CHECK,REM %s
; RUN: opt < %s -passes=loop-unroll -unroll-allow-remainder=0 -pragma-unroll-threshold=1024 -S | FileCheck -check-prefixes=CHECK,NOREM %s
;
; Run loop unrolling twice to verify that loop unrolling metadata is properly
; removed and further unrolling is disabled after the pass is run once.
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
; loop4 contains a small loop which should be completely unrolled by
; the default unrolling heuristics. It serves as a control for the
; unroll(disable) pragma test loop4_with_disable.
;
; CHECK-LABEL: @loop4(
; CHECK-NOT: br i1
define void @loop4(ptr nocapture %a) {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 4
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; #pragma clang loop unroll(disable)
;
; CHECK-LABEL: @loop4_with_disable(
; CHECK: store i32
; CHECK-NOT: store i32
; CHECK: br i1
define void @loop4_with_disable(ptr nocapture %a) {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 4
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !1
for.end: ; preds = %for.body
ret void
}
!1 = !{!1, !2}
!2 = !{!"llvm.loop.unroll.disable"}
; loop64 has a high enough count that it should *not* be unrolled by
; the default unrolling heuristic. It serves as the control for the
; unroll(full) pragma test loop64_with_.* tests below.
;
; CHECK-LABEL: @loop64(
; CHECK: store i32
; CHECK-NOT: store i32
; CHECK: br i1
define void @loop64(ptr nocapture %a) {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 64
br i1 %exitcond, label %for.end, label %for.body
for.end: ; preds = %for.body
ret void
}
; #pragma clang loop unroll(full)
; Loop should be fully unrolled.
;
; CHECK-LABEL: @loop64_with_full(
; CHECK-NOT: br i1
define void @loop64_with_full(ptr nocapture %a) {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 64
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !3
for.end: ; preds = %for.body
ret void
}
!3 = !{!3, !4}
!4 = !{!"llvm.loop.unroll.full"}
; #pragma clang loop unroll_count(4)
; Loop should be unrolled 4 times.
;
; CHECK-LABEL: @loop64_with_count4(
; CHECK: store i32
; CHECK: store i32
; CHECK: store i32
; CHECK: store i32
; CHECK-NOT: store i32
; CHECK: br i1
define void @loop64_with_count4(ptr nocapture %a) {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 64
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !5
for.end: ; preds = %for.body
ret void
}
!5 = !{!5, !6}
!6 = !{!"llvm.loop.unroll.count", i32 4}
; #pragma clang loop unroll(full)
; Full unrolling is requested, but loop has a runtime trip count so
; no unrolling should occur.
;
; CHECK-LABEL: @runtime_loop_with_full(
; CHECK: store i32
; CHECK-NOT: store i32
define void @runtime_loop_with_full(ptr nocapture %a, i32 %b) {
entry:
%cmp3 = icmp sgt i32 %b, 0
br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !8
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %b
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !8
for.end: ; preds = %for.body, %entry
ret void
}
!8 = !{!8, !4}
; #pragma clang loop unroll_count(4)
; Loop has a runtime trip count. Runtime unrolling should occur and loop
; should be duplicated (original and 4x unrolled) if remainder is allowed,
; otherwise loop should not be unrolled.
;
; CHECK-LABEL: @runtime_loop_with_count4(
; CHECK: for.body
; CHECK: store
; REM: store
; REM: store
; REM: store
; CHECK-NOT: store
; CHECK: br i1
; REM: for.body.epil:
; REM: store
; NOREM-NOT: for.body.epil:
; NOREM-NOT: store
; CHECK-NOT: store
; REM: br i1
; NOREM-NOT: br i1
define void @runtime_loop_with_count4(ptr nocapture %a, i32 %b) {
entry:
%cmp3 = icmp sgt i32 %b, 0
br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !9
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %b
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !9
for.end: ; preds = %for.body, %entry
ret void
}
!9 = !{!9, !6}
; #pragma clang loop unroll_count(1)
; Loop should not be unrolled
;
; CHECK-LABEL: @unroll_1(
; CHECK: store i32
; CHECK-NOT: store i32
; CHECK: br i1
define void @unroll_1(ptr nocapture %a, i32 %b) {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 4
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !10
for.end: ; preds = %for.body
ret void
}
!10 = !{!10, !11}
!11 = !{!"llvm.loop.unroll.count", i32 1}
; #pragma clang loop unroll(enable)
; Loop should be fully unrolled.
;
; CHECK-LABEL: @loop64_with_enable(
; CHECK-NOT: br i1
define void @loop64_with_enable(ptr nocapture %a) {
entry:
br label %for.body
for.body: ; preds = %for.body, %entry
%indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%exitcond = icmp eq i64 %indvars.iv.next, 64
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !12
for.end: ; preds = %for.body
ret void
}
!12 = !{!12, !13}
!13 = !{!"llvm.loop.unroll.enable"}
; #pragma clang loop unroll(enable)
; Loop has a runtime trip count and should be runtime unrolled and duplicated
; (original and 8x) if remainder is allowed, otherwise it should not be
; unrolled.
;
; CHECK-LABEL: @runtime_loop_with_enable(
; CHECK: for.body:
; CHECK: store i32
; REM: store i32
; REM: store i32
; REM: store i32
; REM: store i32
; REM: store i32
; REM: store i32
; REM: store i32
; CHECK-NOT: store i32
; CHECK: br i1
; REM: for.body.epil:
; NOREM-NOT: for.body.epil:
; REM: store
; CHECK-NOT: store
; REM: br i1
; NOREM-NOT: br i1
define void @runtime_loop_with_enable(ptr nocapture %a, i32 %b) {
entry:
%cmp3 = icmp sgt i32 %b, 0
br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !8
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %b
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !14
for.end: ; preds = %for.body, %entry
ret void
}
!14 = !{!14, !13}
; #pragma clang loop unroll_count(3)
; Loop has a runtime trip count. Runtime unrolling should occur and loop
; should be duplicated (original and 3x unrolled) if remainder is allowed,
; otherwise it should not be unrolled.
;
; CHECK-LABEL: @runtime_loop_with_count3(
; CHECK: for.body
; CHECK: store
; REM: store
; REM: store
; CHECK-NOT: store
; CHECK: br i1
; REM: for.body.epil:
; REM: store
; NOREM-NOT: for.body.epil:
; NOREM-NOT: store
; CHECK-NOT: store
; REM: br i1
define void @runtime_loop_with_count3(ptr nocapture %a, i32 %b) {
entry:
%cmp3 = icmp sgt i32 %b, 0
br i1 %cmp3, label %for.body, label %for.end, !llvm.loop !16
for.body: ; preds = %entry, %for.body
%indvars.iv = phi i64 [ %indvars.iv.next, %for.body ], [ 0, %entry ]
%arrayidx = getelementptr inbounds i32, ptr %a, i64 %indvars.iv
%0 = load i32, ptr %arrayidx, align 4
%inc = add nsw i32 %0, 1
store i32 %inc, ptr %arrayidx, align 4
%indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
%lftr.wideiv = trunc i64 %indvars.iv.next to i32
%exitcond = icmp eq i32 %lftr.wideiv, %b
br i1 %exitcond, label %for.end, label %for.body, !llvm.loop !15
for.end: ; preds = %for.body, %entry
ret void
}
!15 = !{!15, !16}
!16 = !{!"llvm.loop.unroll.count", i32 3}
|
