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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; REQUIRES: x86-registered-target
; RUN: opt < %s -passes=reassociate,instcombine -S | FileCheck %s --check-prefixes=CHECK,REASSOC_AND_IC --allow-unused-prefixes
; RUN: opt < %s -O2 -S | FileCheck %s --check-prefixes=CHECK,O2 --allow-unused-prefixes
target triple = "x86_64--"
; Test cases in this file are intended to be run with both reassociate and
; instcombine passes enabled.
;
; Test numbering remains continuous across:
; - InstCombine/fast-basictest.ll
; - PhaseOrdering/fast-basictest.ll
; - PhaseOrdering/fast-reassociate-gvn.ll
; - Reassociate/fast-basictest.ll
; test2 ... test18 - both reassociate and instcombine passes
; are required to perform a transform
; ((a + (-3)) + b) + 3 -> a + b
define float @test2(float %reg109, float %reg1111) {
; CHECK-LABEL: @test2(
; CHECK-NEXT: [[REG117:%.*]] = fadd fast float [[REG109:%.*]], [[REG1111:%.*]]
; CHECK-NEXT: ret float [[REG117]]
;
%reg115 = fadd fast float %reg109, -3.000000e+01
%reg116 = fadd fast float %reg115, %reg1111
%reg117 = fadd fast float %reg116, 3.000000e+01
ret float %reg117
}
; Verify that fold is not done without 'fast'
define float @test2_no_FMF(float %reg109, float %reg1111) {
; CHECK-LABEL: @test2_no_FMF(
; CHECK-NEXT: [[REG115:%.*]] = fadd float [[REG109:%.*]], -3.000000e+01
; CHECK-NEXT: [[REG116:%.*]] = fadd float [[REG115]], [[REG1111:%.*]]
; CHECK-NEXT: [[REG117:%.*]] = fadd float [[REG116]], 3.000000e+01
; CHECK-NEXT: ret float [[REG117]]
;
%reg115 = fadd float %reg109, -3.000000e+01
%reg116 = fadd float %reg115, %reg1111
%reg117 = fadd float %reg116, 3.000000e+01
ret float %reg117
}
define float @test2_reassoc(float %reg109, float %reg1111) {
; CHECK-LABEL: @test2_reassoc(
; CHECK-NEXT: [[REG115:%.*]] = fadd reassoc float [[REG109:%.*]], -3.000000e+01
; CHECK-NEXT: [[REG116:%.*]] = fadd reassoc float [[REG115]], [[REG1111:%.*]]
; CHECK-NEXT: [[REG117:%.*]] = fadd reassoc float [[REG116]], 3.000000e+01
; CHECK-NEXT: ret float [[REG117]]
;
%reg115 = fadd reassoc float %reg109, -3.000000e+01
%reg116 = fadd reassoc float %reg115, %reg1111
%reg117 = fadd reassoc float %reg116, 3.000000e+01
ret float %reg117
}
; (x1 * 47) + (x2 * -47) => (x1 - x2) * 47
define float @test13(float %X1, float %X2) {
; CHECK-LABEL: @test13(
; CHECK-NEXT: [[TMP1:%.*]] = fsub fast float [[X1:%.*]], [[X2:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = fmul fast float [[TMP1]], 4.700000e+01
; CHECK-NEXT: ret float [[TMP2]]
;
%B = fmul fast float %X1, 47. ; X1*47
%C = fmul fast float %X2, -47. ; X2*-47
%D = fadd fast float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
ret float %D
}
; Check again with 'reassoc' and 'nsz' ('nsz' not technically required).
define float @test13_reassoc_nsz(float %X1, float %X2) {
; CHECK-LABEL: @test13_reassoc_nsz(
; CHECK-NEXT: [[TMP1:%.*]] = fsub reassoc nsz float [[X1:%.*]], [[X2:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = fmul reassoc nsz float [[TMP1]], 4.700000e+01
; CHECK-NEXT: ret float [[TMP2]]
;
%B = fmul reassoc nsz float %X1, 47. ; X1*47
%C = fmul reassoc nsz float %X2, -47. ; X2*-47
%D = fadd reassoc nsz float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
ret float %D
}
; TODO: This doesn't require 'nsz'. It should fold to ((x1 - x2) * 47.0)
define float @test13_reassoc(float %X1, float %X2) {
; CHECK-LABEL: @test13_reassoc(
; CHECK-NEXT: [[B:%.*]] = fmul reassoc float [[X1:%.*]], 4.700000e+01
; CHECK-NEXT: [[C:%.*]] = fmul reassoc float [[X2:%.*]], 4.700000e+01
; CHECK-NEXT: [[TMP1:%.*]] = fsub reassoc float [[B]], [[C]]
; CHECK-NEXT: ret float [[TMP1]]
;
%B = fmul reassoc float %X1, 47. ; X1*47
%C = fmul reassoc float %X2, -47. ; X2*-47
%D = fadd reassoc float %B, %C ; X1*47 + X2*-47 -> 47*(X1-X2)
ret float %D
}
; (b+(a+1234))+-a -> b+1234
define float @test15(float %b, float %a) {
; CHECK-LABEL: @test15(
; CHECK-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], 1.234000e+03
; CHECK-NEXT: ret float [[TMP1]]
;
%1 = fadd fast float %a, 1234.0
%2 = fadd fast float %b, %1
%3 = fsub fast float 0.0, %a
%4 = fadd fast float %2, %3
ret float %4
}
define float @test15_unary_fneg(float %b, float %a) {
; CHECK-LABEL: @test15_unary_fneg(
; CHECK-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], 1.234000e+03
; CHECK-NEXT: ret float [[TMP1]]
;
%1 = fadd fast float %a, 1234.0
%2 = fadd fast float %b, %1
%3 = fneg fast float %a
%4 = fadd fast float %2, %3
ret float %4
}
define float @test15_reassoc_nsz(float %b, float %a) {
; CHECK-LABEL: @test15_reassoc_nsz(
; CHECK-NEXT: [[TMP1:%.*]] = fadd reassoc nsz float [[B:%.*]], 1.234000e+03
; CHECK-NEXT: ret float [[TMP1]]
;
%1 = fadd reassoc nsz float %a, 1234.0
%2 = fadd reassoc nsz float %b, %1
%3 = fsub reassoc nsz float 0.0, %a
%4 = fadd reassoc nsz float %2, %3
ret float %4
}
define float @test15_reassoc(float %b, float %a) {
; CHECK-LABEL: @test15_reassoc(
; CHECK-NEXT: [[TMP1:%.*]] = fadd reassoc float [[A:%.*]], 1.234000e+03
; CHECK-NEXT: [[TMP2:%.*]] = fadd reassoc float [[TMP1]], [[B:%.*]]
; CHECK-NEXT: [[TMP3:%.*]] = fsub reassoc float 0.000000e+00, [[A]]
; CHECK-NEXT: [[TMP4:%.*]] = fadd reassoc float [[TMP3]], [[TMP2]]
; CHECK-NEXT: ret float [[TMP4]]
;
%1 = fadd reassoc float %a, 1234.0
%2 = fadd reassoc float %b, %1
%3 = fsub reassoc float 0.0, %a
%4 = fadd reassoc float %2, %3
ret float %4
}
; Test that we can turn things like X*-(Y*Z) -> X*-1*Y*Z.
define float @test16(float %a, float %b, float %z) {
; REASSOC_AND_IC-LABEL: @test16(
; REASSOC_AND_IC-NEXT: [[C:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
; REASSOC_AND_IC-NEXT: [[E:%.*]] = fmul fast float [[C]], [[B:%.*]]
; REASSOC_AND_IC-NEXT: [[F:%.*]] = fmul fast float [[E]], [[Z:%.*]]
; REASSOC_AND_IC-NEXT: ret float [[F]]
;
; O2-LABEL: @test16(
; O2-NEXT: [[D:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
; O2-NEXT: [[E:%.*]] = fmul fast float [[D]], [[B:%.*]]
; O2-NEXT: [[G:%.*]] = fmul fast float [[E]], [[Z:%.*]]
; O2-NEXT: ret float [[G]]
;
%c = fsub fast float 0.000000e+00, %z
%d = fmul fast float %a, %b
%e = fmul fast float %c, %d
%f = fmul fast float %e, 1.234500e+04
%g = fsub fast float 0.000000e+00, %f
ret float %g
}
define float @test16_unary_fneg(float %a, float %b, float %z) {
; REASSOC_AND_IC-LABEL: @test16_unary_fneg(
; REASSOC_AND_IC-NEXT: [[E:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
; REASSOC_AND_IC-NEXT: [[F:%.*]] = fmul fast float [[E]], [[B:%.*]]
; REASSOC_AND_IC-NEXT: [[G:%.*]] = fmul fast float [[F]], [[Z:%.*]]
; REASSOC_AND_IC-NEXT: ret float [[G]]
;
; O2-LABEL: @test16_unary_fneg(
; O2-NEXT: [[D:%.*]] = fmul fast float [[A:%.*]], 1.234500e+04
; O2-NEXT: [[E:%.*]] = fmul fast float [[D]], [[B:%.*]]
; O2-NEXT: [[G:%.*]] = fmul fast float [[E]], [[Z:%.*]]
; O2-NEXT: ret float [[G]]
;
%c = fneg fast float %z
%d = fmul fast float %a, %b
%e = fmul fast float %c, %d
%f = fmul fast float %e, 1.234500e+04
%g = fneg fast float %f
ret float %g
}
define float @test16_reassoc_nsz(float %a, float %b, float %z) {
; REASSOC_AND_IC-LABEL: @test16_reassoc_nsz(
; REASSOC_AND_IC-NEXT: [[C:%.*]] = fmul reassoc nsz float [[A:%.*]], 1.234500e+04
; REASSOC_AND_IC-NEXT: [[E:%.*]] = fmul reassoc nsz float [[C]], [[B:%.*]]
; REASSOC_AND_IC-NEXT: [[F:%.*]] = fmul reassoc nsz float [[E]], [[Z:%.*]]
; REASSOC_AND_IC-NEXT: ret float [[F]]
;
; O2-LABEL: @test16_reassoc_nsz(
; O2-NEXT: [[D:%.*]] = fmul reassoc nsz float [[A:%.*]], 1.234500e+04
; O2-NEXT: [[E:%.*]] = fmul reassoc nsz float [[D]], [[B:%.*]]
; O2-NEXT: [[G:%.*]] = fmul reassoc nsz float [[E]], [[Z:%.*]]
; O2-NEXT: ret float [[G]]
;
%c = fsub reassoc nsz float 0.000000e+00, %z
%d = fmul reassoc nsz float %a, %b
%e = fmul reassoc nsz float %c, %d
%f = fmul reassoc nsz float %e, 1.234500e+04
%g = fsub reassoc nsz float 0.000000e+00, %f
ret float %g
}
define float @test16_reassoc(float %a, float %b, float %z) {
; CHECK-LABEL: @test16_reassoc(
; CHECK-NEXT: [[C:%.*]] = fsub reassoc float 0.000000e+00, [[Z:%.*]]
; CHECK-NEXT: [[D:%.*]] = fmul reassoc float [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: [[E:%.*]] = fmul reassoc float [[D]], [[C]]
; CHECK-NEXT: [[F:%.*]] = fmul reassoc float [[E]], 1.234500e+04
; CHECK-NEXT: [[G:%.*]] = fsub reassoc float 0.000000e+00, [[F]]
; CHECK-NEXT: ret float [[G]]
;
%c = fsub reassoc float 0.000000e+00, %z
%d = fmul reassoc float %a, %b
%e = fmul reassoc float %c, %d
%f = fmul reassoc float %e, 1.234500e+04
%g = fsub reassoc float 0.000000e+00, %f
ret float %g
}
; With sub reassociation, constant folding can eliminate the 12 and -12 constants.
define float @test18(float %A, float %B) {
; CHECK-LABEL: @test18(
; CHECK-NEXT: [[Z:%.*]] = fsub fast float [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: ret float [[Z]]
;
%X = fadd fast float -1.200000e+01, %A
%Y = fsub fast float %X, %B
%Z = fadd fast float %Y, 1.200000e+01
ret float %Z
}
define float @test18_reassoc(float %A, float %B) {
; CHECK-LABEL: @test18_reassoc(
; CHECK-NEXT: [[X:%.*]] = fadd reassoc float [[A:%.*]], -1.200000e+01
; CHECK-NEXT: [[Y:%.*]] = fsub reassoc float [[X]], [[B:%.*]]
; CHECK-NEXT: [[Z:%.*]] = fadd reassoc float [[Y]], 1.200000e+01
; CHECK-NEXT: ret float [[Z]]
;
%X = fadd reassoc float -1.200000e+01, %A
%Y = fsub reassoc float %X, %B
%Z = fadd reassoc float %Y, 1.200000e+01
ret float %Z
}
; test18 - check that the bug described in the revision does not appear:
; https://reviews.llvm.org/D72521
; With sub reassociation, constant folding can eliminate the uses of %a.
define float @test19(float %a, float %b, float %c) nounwind {
; REASSOC_AND_IC-LABEL: @test19(
; REASSOC_AND_IC-NEXT: [[TMP1:%.*]] = fadd fast float [[B:%.*]], [[C:%.*]]
; REASSOC_AND_IC-NEXT: [[T7:%.*]] = fneg fast float [[TMP1]]
; REASSOC_AND_IC-NEXT: ret float [[T7]]
;
; O2-LABEL: @test19(
; O2-NEXT: [[TMP1:%.*]] = fadd fast float [[C:%.*]], [[B:%.*]]
; O2-NEXT: [[T7:%.*]] = fneg fast float [[TMP1]]
; O2-NEXT: ret float [[T7]]
;
%t3 = fsub fast float %a, %b
%t5 = fsub fast float %t3, %c
%t7 = fsub fast float %t5, %a
ret float %t7
}
define float @test19_reassoc_nsz(float %a, float %b, float %c) nounwind {
; REASSOC_AND_IC-LABEL: @test19_reassoc_nsz(
; REASSOC_AND_IC-NEXT: [[TMP1:%.*]] = fadd reassoc nsz float [[B:%.*]], [[C:%.*]]
; REASSOC_AND_IC-NEXT: [[T7:%.*]] = fneg reassoc nsz float [[TMP1]]
; REASSOC_AND_IC-NEXT: ret float [[T7]]
;
; O2-LABEL: @test19_reassoc_nsz(
; O2-NEXT: [[TMP1:%.*]] = fadd reassoc nsz float [[C:%.*]], [[B:%.*]]
; O2-NEXT: [[T7:%.*]] = fneg reassoc nsz float [[TMP1]]
; O2-NEXT: ret float [[T7]]
;
%t3 = fsub reassoc nsz float %a, %b
%t5 = fsub reassoc nsz float %t3, %c
%t7 = fsub reassoc nsz float %t5, %a
ret float %t7
}
; Verify the fold is not done with only 'reassoc' ('nsz' is required).
define float @test19_reassoc(float %a, float %b, float %c) nounwind {
; CHECK-LABEL: @test19_reassoc(
; CHECK-NEXT: [[T3:%.*]] = fsub reassoc float [[A:%.*]], [[B:%.*]]
; CHECK-NEXT: [[T5:%.*]] = fsub reassoc float [[T3]], [[C:%.*]]
; CHECK-NEXT: [[T7:%.*]] = fsub reassoc float [[T5]], [[A]]
; CHECK-NEXT: ret float [[T7]]
;
%t3 = fsub reassoc float %a, %b
%t5 = fsub reassoc float %t3, %c
%t7 = fsub reassoc float %t5, %a
ret float %t7
}
|
