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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
; RUN: opt < %s -passes=tailcallelim -verify-dom-info -S | FileCheck %s
define i32 @test1_factorial(i32 %x) {
; CHECK-LABEL: define i32 @test1_factorial(
; CHECK-SAME: i32 [[X:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
; CHECK: tailrecurse:
; CHECK-NEXT: [[ACCUMULATOR_TR:%.*]] = phi i32 [ 1, [[ENTRY:%.*]] ], [ [[ACCUMULATE:%.*]], [[THEN:%.*]] ]
; CHECK-NEXT: [[X_TR:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[TMP_6:%.*]], [[THEN]] ]
; CHECK-NEXT: [[TMP_1:%.*]] = icmp sgt i32 [[X_TR]], 0
; CHECK-NEXT: br i1 [[TMP_1]], label [[THEN]], label [[ELSE:%.*]]
; CHECK: then:
; CHECK-NEXT: [[TMP_6]] = add i32 [[X_TR]], -1
; CHECK-NEXT: [[ACCUMULATE]] = mul i32 [[ACCUMULATOR_TR]], [[X_TR]]
; CHECK-NEXT: br label [[TAILRECURSE]]
; CHECK: else:
; CHECK-NEXT: [[ACCUMULATOR_RET_TR:%.*]] = mul i32 [[ACCUMULATOR_TR]], 1
; CHECK-NEXT: ret i32 [[ACCUMULATOR_RET_TR]]
;
entry:
%tmp.1 = icmp sgt i32 %x, 0
br i1 %tmp.1, label %then, label %else
then:
%tmp.6 = add i32 %x, -1
%recurse = call i32 @test1_factorial( i32 %tmp.6 )
%accumulate = mul i32 %recurse, %x
ret i32 %accumulate
else:
ret i32 1
}
; This is a more aggressive form of accumulator recursion insertion, which
; requires noticing that X doesn't change as we perform the tailcall.
define i32 @test2_mul(i32 %x, i32 %y) {
; CHECK-LABEL: define i32 @test2_mul(
; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
; CHECK: tailrecurse:
; CHECK-NEXT: [[ACCUMULATOR_TR:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ACCUMULATE:%.*]], [[ENDIF:%.*]] ]
; CHECK-NEXT: [[Y_TR:%.*]] = phi i32 [ [[Y]], [[ENTRY]] ], [ [[TMP_8:%.*]], [[ENDIF]] ]
; CHECK-NEXT: [[TMP_1:%.*]] = icmp eq i32 [[Y_TR]], 0
; CHECK-NEXT: br i1 [[TMP_1]], label [[RETURN:%.*]], label [[ENDIF]]
; CHECK: endif:
; CHECK-NEXT: [[TMP_8]] = add i32 [[Y_TR]], -1
; CHECK-NEXT: [[ACCUMULATE]] = add i32 [[ACCUMULATOR_TR]], [[X]]
; CHECK-NEXT: br label [[TAILRECURSE]]
; CHECK: return:
; CHECK-NEXT: [[ACCUMULATOR_RET_TR:%.*]] = add i32 [[ACCUMULATOR_TR]], [[X]]
; CHECK-NEXT: ret i32 [[ACCUMULATOR_RET_TR]]
;
entry:
%tmp.1 = icmp eq i32 %y, 0
br i1 %tmp.1, label %return, label %endif
endif:
%tmp.8 = add i32 %y, -1
%recurse = call i32 @test2_mul( i32 %x, i32 %tmp.8 )
%accumulate = add i32 %recurse, %x
ret i32 %accumulate
return:
ret i32 %x
}
define i64 @test3_fib(i64 %n) nounwind readnone {
; CHECK-LABEL: define i64 @test3_fib(
; CHECK-SAME: i64 [[N:%.*]]) #[[ATTR0:[0-9]+]] {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
; CHECK: tailrecurse:
; CHECK-NEXT: [[ACCUMULATOR_TR:%.*]] = phi i64 [ 0, [[ENTRY:%.*]] ], [ [[ACCUMULATE:%.*]], [[BB1:%.*]] ]
; CHECK-NEXT: [[N_TR:%.*]] = phi i64 [ [[N]], [[ENTRY]] ], [ [[TMP1:%.*]], [[BB1]] ]
; CHECK-NEXT: switch i64 [[N_TR]], label [[BB1]] [
; CHECK-NEXT: i64 0, label [[BB2:%.*]]
; CHECK-NEXT: i64 1, label [[BB2]]
; CHECK-NEXT: ]
; CHECK: bb1:
; CHECK-NEXT: [[TMP0:%.*]] = add i64 [[N_TR]], -1
; CHECK-NEXT: [[RECURSE1:%.*]] = tail call i64 @test3_fib(i64 [[TMP0]]) #[[ATTR2:[0-9]+]]
; CHECK-NEXT: [[TMP1]] = add i64 [[N_TR]], -2
; CHECK-NEXT: [[ACCUMULATE]] = add nsw i64 [[ACCUMULATOR_TR]], [[RECURSE1]]
; CHECK-NEXT: br label [[TAILRECURSE]]
; CHECK: bb2:
; CHECK-NEXT: [[ACCUMULATOR_RET_TR:%.*]] = add nsw i64 [[ACCUMULATOR_TR]], [[N_TR]]
; CHECK-NEXT: ret i64 [[ACCUMULATOR_RET_TR]]
;
entry:
switch i64 %n, label %bb1 [
i64 0, label %bb2
i64 1, label %bb2
]
bb1:
%0 = add i64 %n, -1
%recurse1 = tail call i64 @test3_fib(i64 %0) nounwind
%1 = add i64 %n, -2
%recurse2 = tail call i64 @test3_fib(i64 %1) nounwind
%accumulate = add nsw i64 %recurse2, %recurse1
ret i64 %accumulate
bb2:
ret i64 %n
}
define i32 @test4_base_case_call() local_unnamed_addr {
; CHECK-LABEL: define i32 @test4_base_case_call() local_unnamed_addr {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
; CHECK: tailrecurse:
; CHECK-NEXT: [[ACCUMULATOR_TR:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ACCUMULATE:%.*]], [[SW_DEFAULT:%.*]] ]
; CHECK-NEXT: [[BASE:%.*]] = tail call i32 @test4_helper()
; CHECK-NEXT: switch i32 [[BASE]], label [[SW_DEFAULT]] [
; CHECK-NEXT: i32 1, label [[CLEANUP:%.*]]
; CHECK-NEXT: i32 5, label [[CLEANUP]]
; CHECK-NEXT: i32 7, label [[CLEANUP]]
; CHECK-NEXT: ]
; CHECK: sw.default:
; CHECK-NEXT: [[ACCUMULATE]] = add nsw i32 [[ACCUMULATOR_TR]], 1
; CHECK-NEXT: br label [[TAILRECURSE]]
; CHECK: cleanup:
; CHECK-NEXT: [[ACCUMULATOR_RET_TR:%.*]] = add nsw i32 [[ACCUMULATOR_TR]], [[BASE]]
; CHECK-NEXT: ret i32 [[ACCUMULATOR_RET_TR]]
;
entry:
%base = call i32 @test4_helper()
switch i32 %base, label %sw.default [
i32 1, label %cleanup
i32 5, label %cleanup
i32 7, label %cleanup
]
sw.default:
%recurse = call i32 @test4_base_case_call()
%accumulate = add nsw i32 %recurse, 1
br label %cleanup
cleanup:
%retval.0 = phi i32 [ %accumulate, %sw.default ], [ %base, %entry ], [ %base, %entry ], [ %base, %entry ]
ret i32 %retval.0
}
declare i32 @test4_helper()
define i32 @test5_base_case_load(ptr nocapture %A, i32 %n) local_unnamed_addr {
; CHECK-LABEL: define i32 @test5_base_case_load(
; CHECK-SAME: ptr nocapture [[A:%.*]], i32 [[N:%.*]]) local_unnamed_addr {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
; CHECK: tailrecurse:
; CHECK-NEXT: [[ACCUMULATOR_TR:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ACCUMULATE:%.*]], [[IF_END:%.*]] ]
; CHECK-NEXT: [[N_TR:%.*]] = phi i32 [ [[N]], [[ENTRY]] ], [ [[SUB:%.*]], [[IF_END]] ]
; CHECK-NEXT: [[CMP:%.*]] = icmp eq i32 [[N_TR]], 0
; CHECK-NEXT: br i1 [[CMP]], label [[IF_THEN:%.*]], label [[IF_END]]
; CHECK: if.then:
; CHECK-NEXT: [[BASE:%.*]] = load i32, ptr [[A]], align 4
; CHECK-NEXT: [[ACCUMULATOR_RET_TR:%.*]] = add i32 [[ACCUMULATOR_TR]], [[BASE]]
; CHECK-NEXT: ret i32 [[ACCUMULATOR_RET_TR]]
; CHECK: if.end:
; CHECK-NEXT: [[IDXPROM:%.*]] = zext i32 [[N_TR]] to i64
; CHECK-NEXT: [[ARRAYIDX1:%.*]] = getelementptr inbounds i32, ptr [[A]], i64 [[IDXPROM]]
; CHECK-NEXT: [[LOAD:%.*]] = load i32, ptr [[ARRAYIDX1]], align 4
; CHECK-NEXT: [[SUB]] = add i32 [[N_TR]], -1
; CHECK-NEXT: [[ACCUMULATE]] = add i32 [[ACCUMULATOR_TR]], [[LOAD]]
; CHECK-NEXT: br label [[TAILRECURSE]]
;
entry:
%cmp = icmp eq i32 %n, 0
br i1 %cmp, label %if.then, label %if.end
if.then:
%base = load i32, ptr %A, align 4
ret i32 %base
if.end:
%idxprom = zext i32 %n to i64
%arrayidx1 = getelementptr inbounds i32, ptr %A, i64 %idxprom
%load = load i32, ptr %arrayidx1, align 4
%sub = add i32 %n, -1
%recurse = tail call i32 @test5_base_case_load(ptr %A, i32 %sub)
%accumulate = add i32 %recurse, %load
ret i32 %accumulate
}
define i32 @test6_multiple_returns(i32 %x, i32 %y) local_unnamed_addr {
; CHECK-LABEL: define i32 @test6_multiple_returns(
; CHECK-SAME: i32 [[X:%.*]], i32 [[Y:%.*]]) local_unnamed_addr {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
; CHECK: tailrecurse:
; CHECK-NEXT: [[ACCUMULATOR_TR:%.*]] = phi i32 [ [[ACCUMULATOR_TR]], [[CASE99:%.*]] ], [ 0, [[ENTRY:%.*]] ], [ [[ACCUMULATE:%.*]], [[DEFAULT:%.*]] ]
; CHECK-NEXT: [[X_TR:%.*]] = phi i32 [ [[X]], [[ENTRY]] ], [ [[SUB1:%.*]], [[CASE99]] ], [ [[SUB2:%.*]], [[DEFAULT]] ]
; CHECK-NEXT: [[RET_TR:%.*]] = phi i32 [ poison, [[ENTRY]] ], [ [[CURRENT_RET_TR:%.*]], [[CASE99]] ], [ [[RET_TR]], [[DEFAULT]] ]
; CHECK-NEXT: [[RET_KNOWN_TR:%.*]] = phi i1 [ false, [[ENTRY]] ], [ true, [[CASE99]] ], [ [[RET_KNOWN_TR]], [[DEFAULT]] ]
; CHECK-NEXT: switch i32 [[X_TR]], label [[DEFAULT]] [
; CHECK-NEXT: i32 0, label [[CASE0:%.*]]
; CHECK-NEXT: i32 99, label [[CASE99]]
; CHECK-NEXT: ]
; CHECK: case0:
; CHECK-NEXT: [[HELPER:%.*]] = tail call i32 @test6_helper()
; CHECK-NEXT: [[ACCUMULATOR_RET_TR2:%.*]] = add i32 [[ACCUMULATOR_TR]], [[HELPER]]
; CHECK-NEXT: [[CURRENT_RET_TR1:%.*]] = select i1 [[RET_KNOWN_TR]], i32 [[RET_TR]], i32 [[ACCUMULATOR_RET_TR2]]
; CHECK-NEXT: ret i32 [[CURRENT_RET_TR1]]
; CHECK: case99:
; CHECK-NEXT: [[SUB1]] = add i32 [[X_TR]], -1
; CHECK-NEXT: [[ACCUMULATOR_RET_TR:%.*]] = add i32 [[ACCUMULATOR_TR]], 18
; CHECK-NEXT: [[CURRENT_RET_TR]] = select i1 [[RET_KNOWN_TR]], i32 [[RET_TR]], i32 [[ACCUMULATOR_RET_TR]]
; CHECK-NEXT: br label [[TAILRECURSE]]
; CHECK: default:
; CHECK-NEXT: [[SUB2]] = add i32 [[X_TR]], -1
; CHECK-NEXT: [[ACCUMULATE]] = add i32 [[ACCUMULATOR_TR]], [[Y]]
; CHECK-NEXT: br label [[TAILRECURSE]]
;
entry:
switch i32 %x, label %default [
i32 0, label %case0
i32 99, label %case99
]
case0:
%helper = call i32 @test6_helper()
ret i32 %helper
case99:
%sub1 = add i32 %x, -1
%recurse1 = call i32 @test6_multiple_returns(i32 %sub1, i32 %y)
ret i32 18
default:
%sub2 = add i32 %x, -1
%recurse2 = call i32 @test6_multiple_returns(i32 %sub2, i32 %y)
%accumulate = add i32 %recurse2, %y
ret i32 %accumulate
}
declare i32 @test6_helper()
; It is only safe to transform one accumulator per function, make sure we don't
; try to remove more.
define i32 @test7_multiple_accumulators(i32 %a) local_unnamed_addr {
; CHECK-LABEL: define i32 @test7_multiple_accumulators(
; CHECK-SAME: i32 [[A:%.*]]) local_unnamed_addr {
; CHECK-NEXT: entry:
; CHECK-NEXT: br label [[TAILRECURSE:%.*]]
; CHECK: tailrecurse:
; CHECK-NEXT: [[ACCUMULATOR_TR:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[ACCUMULATE1:%.*]], [[IF_THEN2:%.*]] ]
; CHECK-NEXT: [[A_TR:%.*]] = phi i32 [ [[A]], [[ENTRY]] ], [ [[SUB:%.*]], [[IF_THEN2]] ]
; CHECK-NEXT: [[TOBOOL:%.*]] = icmp eq i32 [[A_TR]], 0
; CHECK-NEXT: br i1 [[TOBOOL]], label [[RETURN:%.*]], label [[IF_END:%.*]]
; CHECK: if.end:
; CHECK-NEXT: [[AND:%.*]] = and i32 [[A_TR]], 1
; CHECK-NEXT: [[TOBOOL1:%.*]] = icmp eq i32 [[AND]], 0
; CHECK-NEXT: [[SUB]] = add nsw i32 [[A_TR]], -1
; CHECK-NEXT: br i1 [[TOBOOL1]], label [[IF_END3:%.*]], label [[IF_THEN2]]
; CHECK: if.then2:
; CHECK-NEXT: [[ACCUMULATE1]] = add nsw i32 [[ACCUMULATOR_TR]], 1
; CHECK-NEXT: br label [[TAILRECURSE]]
; CHECK: if.end3:
; CHECK-NEXT: [[RECURSE2:%.*]] = tail call i32 @test7_multiple_accumulators(i32 [[SUB]])
; CHECK-NEXT: [[ACCUMULATE2:%.*]] = mul nsw i32 [[RECURSE2]], 2
; CHECK-NEXT: [[ACCUMULATOR_RET_TR:%.*]] = add nsw i32 [[ACCUMULATOR_TR]], [[ACCUMULATE2]]
; CHECK-NEXT: ret i32 [[ACCUMULATOR_RET_TR]]
; CHECK: return:
; CHECK-NEXT: [[ACCUMULATOR_RET_TR1:%.*]] = add nsw i32 [[ACCUMULATOR_TR]], 0
; CHECK-NEXT: ret i32 [[ACCUMULATOR_RET_TR1]]
;
entry:
%tobool = icmp eq i32 %a, 0
br i1 %tobool, label %return, label %if.end
if.end:
%and = and i32 %a, 1
%tobool1 = icmp eq i32 %and, 0
%sub = add nsw i32 %a, -1
br i1 %tobool1, label %if.end3, label %if.then2
if.then2:
%recurse1 = tail call i32 @test7_multiple_accumulators(i32 %sub)
%accumulate1 = add nsw i32 %recurse1, 1
br label %return
if.end3:
%recurse2 = tail call i32 @test7_multiple_accumulators(i32 %sub)
%accumulate2 = mul nsw i32 %recurse2, 2
br label %return
return:
%retval.0 = phi i32 [ %accumulate1, %if.then2 ], [ %accumulate2, %if.end3 ], [ 0, %entry ]
ret i32 %retval.0
}
%struct.ListNode = type { i32, ptr }
; We cannot TRE commutative, non-associative intrinsics
define i32 @test_non_associative_sadd_sat(ptr %a) local_unnamed_addr {
; CHECK-LABEL: define i32 @test_non_associative_sadd_sat(
; CHECK-SAME: ptr [[A:%.*]]) local_unnamed_addr {
; CHECK-NEXT: entry:
; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq ptr [[A]], null
; CHECK-NEXT: br i1 [[TOBOOL_NOT]], label [[COMMON_RET6:%.*]], label [[IF_END:%.*]]
; CHECK: common.ret6:
; CHECK-NEXT: ret i32 -1
; CHECK: if.end:
; CHECK-NEXT: [[TMP0:%.*]] = load i32, ptr [[A]], align 4
; CHECK-NEXT: [[NEXT:%.*]] = getelementptr inbounds [[STRUCT_LISTNODE:%.*]], ptr [[A]], i64 0, i32 1
; CHECK-NEXT: [[TMP1:%.*]] = load ptr, ptr [[NEXT]], align 8
; CHECK-NEXT: [[CALL:%.*]] = tail call i32 @test_non_associative_sadd_sat(ptr [[TMP1]])
; CHECK-NEXT: [[DOTSROA_SPECULATED:%.*]] = tail call i32 @llvm.sadd.sat.i32(i32 [[TMP0]], i32 [[CALL]])
; CHECK-NEXT: ret i32 [[DOTSROA_SPECULATED]]
;
entry:
%tobool.not = icmp eq ptr %a, null
br i1 %tobool.not, label %common.ret6, label %if.end
common.ret6: ; preds = %entry, %if.end
%common.ret6.op = phi i32 [ %.sroa.speculated, %if.end ], [ -1, %entry ]
ret i32 %common.ret6.op
if.end: ; preds = %entry
%0 = load i32, ptr %a
%next = getelementptr inbounds %struct.ListNode, ptr %a, i64 0, i32 1
%1 = load ptr, ptr %next
%call = tail call i32 @test_non_associative_sadd_sat(ptr %1)
%.sroa.speculated = tail call i32 @llvm.sadd.sat.i32(i32 %0, i32 %call)
br label %common.ret6
}
declare i32 @llvm.sadd.sat.i32(i32, i32)
|
