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
|
; This test makes sure that mul instructions are properly eliminated.
; RUN: opt < %s -instcombine -S | FileCheck %s
define i32 @test1(i32 %A) {
; CHECK-LABEL: @test1(
%B = mul i32 %A, 1 ; <i32> [#uses=1]
ret i32 %B
; CHECK: ret i32 %A
}
define i32 @test2(i32 %A) {
; CHECK-LABEL: @test2(
; Should convert to an add instruction
%B = mul i32 %A, 2 ; <i32> [#uses=1]
ret i32 %B
; CHECK: shl i32 %A, 1
}
define i32 @test3(i32 %A) {
; CHECK-LABEL: @test3(
; This should disappear entirely
%B = mul i32 %A, 0 ; <i32> [#uses=1]
ret i32 %B
; CHECK: ret i32 0
}
define double @test4(double %A) {
; CHECK-LABEL: @test4(
; This is safe for FP
%B = fmul double 1.000000e+00, %A ; <double> [#uses=1]
ret double %B
; CHECK: ret double %A
}
define i32 @test5(i32 %A) {
; CHECK-LABEL: @test5(
%B = mul i32 %A, 8 ; <i32> [#uses=1]
ret i32 %B
; CHECK: shl i32 %A, 3
}
define i8 @test6(i8 %A) {
; CHECK-LABEL: @test6(
%B = mul i8 %A, 8 ; <i8> [#uses=1]
%C = mul i8 %B, 8 ; <i8> [#uses=1]
ret i8 %C
; CHECK: shl i8 %A, 6
}
define i32 @test7(i32 %i) {
; CHECK-LABEL: @test7(
%tmp = mul i32 %i, -1 ; <i32> [#uses=1]
ret i32 %tmp
; CHECK: sub i32 0, %i
}
define i64 @test8(i64 %i) {
; CHECK-LABEL: @test8(
%j = mul i64 %i, -1 ; <i64> [#uses=1]
ret i64 %j
; CHECK: sub i64 0, %i
}
define i32 @test9(i32 %i) {
; CHECK-LABEL: @test9(
%j = mul i32 %i, -1 ; <i32> [#uses=1]
ret i32 %j
; CHECK: sub i32 0, %i
}
define i32 @test10(i32 %a, i32 %b) {
; CHECK-LABEL: @test10(
%c = icmp slt i32 %a, 0 ; <i1> [#uses=1]
%d = zext i1 %c to i32 ; <i32> [#uses=1]
; e = b & (a >> 31)
%e = mul i32 %d, %b ; <i32> [#uses=1]
ret i32 %e
; CHECK: [[TEST10:%.*]] = ashr i32 %a, 31
; CHECK-NEXT: %e = and i32 [[TEST10]], %b
; CHECK-NEXT: ret i32 %e
}
define i32 @test11(i32 %a, i32 %b) {
; CHECK-LABEL: @test11(
%c = icmp sle i32 %a, -1 ; <i1> [#uses=1]
%d = zext i1 %c to i32 ; <i32> [#uses=1]
; e = b & (a >> 31)
%e = mul i32 %d, %b ; <i32> [#uses=1]
ret i32 %e
; CHECK: [[TEST11:%.*]] = ashr i32 %a, 31
; CHECK-NEXT: %e = and i32 [[TEST11]], %b
; CHECK-NEXT: ret i32 %e
}
define i32 @test12(i32 %a, i32 %b) {
; CHECK-LABEL: @test12(
%c = icmp ugt i32 %a, 2147483647 ; <i1> [#uses=1]
%d = zext i1 %c to i32 ; <i32> [#uses=1]
%e = mul i32 %d, %b ; <i32> [#uses=1]
ret i32 %e
; CHECK: [[TEST12:%.*]] = ashr i32 %a, 31
; CHECK-NEXT: %e = and i32 [[TEST12]], %b
; CHECK-NEXT: ret i32 %e
}
; PR2642
define internal void @test13(<4 x float>*) {
; CHECK-LABEL: @test13(
load <4 x float>, <4 x float>* %0, align 1
fmul <4 x float> %2, < float 1.000000e+00, float 1.000000e+00, float 1.000000e+00, float 1.000000e+00 >
store <4 x float> %3, <4 x float>* %0, align 1
ret void
; CHECK-NEXT: ret void
}
define <16 x i8> @test14(<16 x i8> %a) {
; CHECK-LABEL: @test14(
%b = mul <16 x i8> %a, zeroinitializer
ret <16 x i8> %b
; CHECK-NEXT: ret <16 x i8> zeroinitializer
}
; rdar://7293527
define i32 @test15(i32 %A, i32 %B) {
; CHECK-LABEL: @test15(
entry:
%shl = shl i32 1, %B
%m = mul i32 %shl, %A
ret i32 %m
; CHECK: shl i32 %A, %B
}
; X * Y (when Y is 0 or 1) --> x & (0-Y)
define i32 @test16(i32 %b, i1 %c) {
; CHECK-LABEL: @test16(
%d = zext i1 %c to i32 ; <i32> [#uses=1]
; e = b & (a >> 31)
%e = mul i32 %d, %b ; <i32> [#uses=1]
ret i32 %e
; CHECK: [[TEST16:%.*]] = select i1 %c, i32 %b, i32 0
; CHECK-NEXT: ret i32 [[TEST16]]
}
; X * Y (when Y is 0 or 1) --> x & (0-Y)
define i32 @test17(i32 %a, i32 %b) {
; CHECK-LABEL: @test17(
%a.lobit = lshr i32 %a, 31
%e = mul i32 %a.lobit, %b
ret i32 %e
; CHECK: [[TEST17:%.*]] = ashr i32 %a, 31
; CHECK-NEXT: %e = and i32 [[TEST17]], %b
; CHECK-NEXT: ret i32 %e
}
define i32 @test18(i32 %A, i32 %B) {
; CHECK-LABEL: @test18(
%C = and i32 %A, 1
%D = and i32 %B, 1
%E = mul i32 %C, %D
%F = and i32 %E, 16
ret i32 %F
; CHECK-NEXT: ret i32 0
}
declare {i32, i1} @llvm.smul.with.overflow.i32(i32, i32)
declare void @use(i1)
define i32 @test19(i32 %A, i32 %B) {
; CHECK-LABEL: @test19(
%C = and i32 %A, 1
%D = and i32 %B, 1
; It would be nice if we also started proving that this doesn't overflow.
%E = call {i32, i1} @llvm.smul.with.overflow.i32(i32 %C, i32 %D)
%F = extractvalue {i32, i1} %E, 0
%G = extractvalue {i32, i1} %E, 1
call void @use(i1 %G)
%H = and i32 %F, 16
ret i32 %H
; CHECK: ret i32 0
}
define <2 x i64> @test20(<2 x i64> %A) {
; CHECK-LABEL: @test20(
%B = add <2 x i64> %A, <i64 12, i64 14>
%C = mul <2 x i64> %B, <i64 3, i64 2>
ret <2 x i64> %C
; CHECK: mul <2 x i64> %A, <i64 3, i64 2>
; CHECK: add <2 x i64> %{{.}}, <i64 36, i64 28>
}
define <2 x i1> @test21(<2 x i1> %A, <2 x i1> %B) {
; CHECK-LABEL: @test21(
%C = mul <2 x i1> %A, %B
ret <2 x i1> %C
; CHECK: %C = and <2 x i1> %A, %B
}
define i32 @test22(i32 %A) {
; CHECK-LABEL: @test22(
%B = mul nsw i32 %A, -1
ret i32 %B
; CHECK: sub nsw i32 0, %A
}
define i32 @test23(i32 %A) {
; CHECK-LABEL: @test23(
%B = shl nuw i32 %A, 1
%C = mul nuw i32 %B, 3
ret i32 %C
; CHECK: mul nuw i32 %A, 6
}
define i32 @test24(i32 %A) {
; CHECK-LABEL: @test24(
%B = shl nsw i32 %A, 1
%C = mul nsw i32 %B, 3
ret i32 %C
; CHECK: mul nsw i32 %A, 6
}
define i32 @test25(i32 %A, i32 %B) {
; CHECK-LABEL: @test25(
%C = sub nsw i32 0, %A
%D = sub nsw i32 0, %B
%E = mul nsw i32 %C, %D
ret i32 %E
; CHECK: mul nsw i32 %A, %B
}
define i32 @test26(i32 %A, i32 %B) {
; CHECK-LABEL: @test26(
%C = shl nsw i32 1, %B
%D = mul nsw i32 %A, %C
ret i32 %D
; CHECK: shl nsw i32 %A, %B
}
define i32 @test27(i32 %A, i32 %B) {
; CHECK-LABEL: @test27(
%C = shl i32 1, %B
%D = mul nuw i32 %A, %C
ret i32 %D
; CHECK: shl nuw i32 %A, %B
}
define i32 @test28(i32 %A) {
; CHECK-LABEL: @test28(
%B = shl i32 1, %A
%C = mul nsw i32 %B, %B
ret i32 %C
; CHECK: %[[shl1:.*]] = shl i32 1, %A
; CHECK-NEXT: %[[shl2:.*]] = shl i32 %[[shl1]], %A
; CHECK-NEXT: ret i32 %[[shl2]]
}
define i64 @test29(i31 %A, i31 %B) {
; CHECK-LABEL: @test29(
%C = sext i31 %A to i64
%D = sext i31 %B to i64
%E = mul i64 %C, %D
ret i64 %E
; CHECK: %[[sext1:.*]] = sext i31 %A to i64
; CHECK-NEXT: %[[sext2:.*]] = sext i31 %B to i64
; CHECK-NEXT: %[[mul:.*]] = mul nsw i64 %[[sext1]], %[[sext2]]
; CHECK-NEXT: ret i64 %[[mul]]
}
define i64 @test30(i32 %A, i32 %B) {
; CHECK-LABEL: @test30(
%C = zext i32 %A to i64
%D = zext i32 %B to i64
%E = mul i64 %C, %D
ret i64 %E
; CHECK: %[[zext1:.*]] = zext i32 %A to i64
; CHECK-NEXT: %[[zext2:.*]] = zext i32 %B to i64
; CHECK-NEXT: %[[mul:.*]] = mul nuw i64 %[[zext1]], %[[zext2]]
; CHECK-NEXT: ret i64 %[[mul]]
}
@PR22087 = external global i32
define i32 @test31(i32 %V) {
; CHECK-LABEL: @test31
%mul = mul i32 %V, shl (i32 1, i32 zext (i1 icmp ne (i32* inttoptr (i64 1 to i32*), i32* @PR22087) to i32))
ret i32 %mul
; CHECK: %[[mul:.*]] = shl i32 %V, zext (i1 icmp ne (i32* inttoptr (i64 1 to i32*), i32* @PR22087) to i32)
; CHECK-NEXT: ret i32 %[[mul]]
}
|
