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
|
; Tests to make sure elimination of casts is working correctly
; RUN: opt < %s -instcombine -S | FileCheck %s
@inbuf = external global [32832 x i8] ; <[32832 x i8]*> [#uses=1]
define i32 @test1(i32 %A) {
%c1 = bitcast i32 %A to i32 ; <i32> [#uses=1]
%c2 = bitcast i32 %c1 to i32 ; <i32> [#uses=1]
ret i32 %c2
; CHECK: ret i32 %A
}
define i64 @test2(i8 %A) {
%c1 = zext i8 %A to i16 ; <i16> [#uses=1]
%c2 = zext i16 %c1 to i32 ; <i32> [#uses=1]
%Ret = zext i32 %c2 to i64 ; <i64> [#uses=1]
ret i64 %Ret
; CHECK: %Ret = zext i8 %A to i64
; CHECK: ret i64 %Ret
}
; This function should just use bitwise AND
define i64 @test3(i64 %A) {
%c1 = trunc i64 %A to i8 ; <i8> [#uses=1]
%c2 = zext i8 %c1 to i64 ; <i64> [#uses=1]
ret i64 %c2
; CHECK: %c2 = and i64 %A, 255
; CHECK: ret i64 %c2
}
define i32 @test4(i32 %A, i32 %B) {
%COND = icmp slt i32 %A, %B ; <i1> [#uses=1]
; Booleans are unsigned integrals
%c = zext i1 %COND to i8 ; <i8> [#uses=1]
; for the cast elim purpose
%result = zext i8 %c to i32 ; <i32> [#uses=1]
ret i32 %result
; CHECK: %COND = icmp slt i32 %A, %B
; CHECK: %result = zext i1 %COND to i32
; CHECK: ret i32 %result
}
define i32 @test5(i1 %B) {
; This cast should get folded into
%c = zext i1 %B to i8 ; <i8> [#uses=1]
; this cast
%result = zext i8 %c to i32 ; <i32> [#uses=1]
ret i32 %result
; CHECK: %result = zext i1 %B to i32
; CHECK: ret i32 %result
}
define i32 @test6(i64 %A) {
%c1 = trunc i64 %A to i32 ; <i32> [#uses=1]
%res = bitcast i32 %c1 to i32 ; <i32> [#uses=1]
ret i32 %res
; CHECK: %res = trunc i64 %A to i32
; CHECK: ret i32 %res
}
define i64 @test7(i1 %A) {
%c1 = zext i1 %A to i32 ; <i32> [#uses=1]
%res = sext i32 %c1 to i64 ; <i64> [#uses=1]
ret i64 %res
; CHECK: %res = zext i1 %A to i64
; CHECK: ret i64 %res
}
define i64 @test8(i8 %A) {
%c1 = sext i8 %A to i64 ; <i64> [#uses=1]
%res = bitcast i64 %c1 to i64 ; <i64> [#uses=1]
ret i64 %res
; CHECK: %res = sext i8 %A to i64
; CHECK: ret i64 %res
}
define i16 @test9(i16 %A) {
%c1 = sext i16 %A to i32 ; <i32> [#uses=1]
%c2 = trunc i32 %c1 to i16 ; <i16> [#uses=1]
ret i16 %c2
; CHECK: ret i16 %A
}
define i16 @test10(i16 %A) {
%c1 = sext i16 %A to i32 ; <i32> [#uses=1]
%c2 = trunc i32 %c1 to i16 ; <i16> [#uses=1]
ret i16 %c2
; CHECK: ret i16 %A
}
declare void @varargs(i32, ...)
define void @test11(i32* %P) {
%c = bitcast i32* %P to i16* ; <i16*> [#uses=1]
call void (i32, ...)* @varargs( i32 5, i16* %c )
ret void
; CHECK: call void (i32, ...)* @varargs(i32 5, i32* %P)
; CHECK: ret void
}
define i32* @test12() {
%p = malloc [4 x i8] ; <[4 x i8]*> [#uses=1]
%c = bitcast [4 x i8]* %p to i32* ; <i32*> [#uses=1]
ret i32* %c
; CHECK: %p = malloc i32
; CHECK: ret i32* %p
}
define i8* @test13(i64 %A) {
%c = getelementptr [0 x i8]* bitcast ([32832 x i8]* @inbuf to [0 x i8]*), i64 0, i64 %A ; <i8*> [#uses=1]
ret i8* %c
; CHECK: %c = getelementptr [32832 x i8]* @inbuf, i64 0, i64 %A
; CHECK: ret i8* %c
}
define i1 @test14(i8 %A) {
%c = bitcast i8 %A to i8 ; <i8> [#uses=1]
%X = icmp ult i8 %c, -128 ; <i1> [#uses=1]
ret i1 %X
; CHECK: %X = icmp sgt i8 %A, -1
; CHECK: ret i1 %X
}
; This just won't occur when there's no difference between ubyte and sbyte
;bool %test15(ubyte %A) {
; %c = cast ubyte %A to sbyte
; %X = setlt sbyte %c, 0 ; setgt %A, 127
; ret bool %X
;}
define i1 @test16(i32* %P) {
%c = icmp ne i32* %P, null ; <i1> [#uses=1]
ret i1 %c
; CHECK: %c = icmp ne i32* %P, null
; CHECK: ret i1 %c
}
define i16 @test17(i1 %tmp3) {
%c = zext i1 %tmp3 to i32 ; <i32> [#uses=1]
%t86 = trunc i32 %c to i16 ; <i16> [#uses=1]
ret i16 %t86
; CHECK: %t86 = zext i1 %tmp3 to i16
; CHECK: ret i16 %t86
}
define i16 @test18(i8 %tmp3) {
%c = sext i8 %tmp3 to i32 ; <i32> [#uses=1]
%t86 = trunc i32 %c to i16 ; <i16> [#uses=1]
ret i16 %t86
; CHECK: %t86 = sext i8 %tmp3 to i16
; CHECK: ret i16 %t86
}
define i1 @test19(i32 %X) {
%c = sext i32 %X to i64 ; <i64> [#uses=1]
%Z = icmp slt i64 %c, 12345 ; <i1> [#uses=1]
ret i1 %Z
; CHECK: %Z = icmp slt i32 %X, 12345
; CHECK: ret i1 %Z
}
define i1 @test20(i1 %B) {
%c = zext i1 %B to i32 ; <i32> [#uses=1]
%D = icmp slt i32 %c, -1 ; <i1> [#uses=1]
;; false
ret i1 %D
; CHECK: ret i1 false
}
define i32 @test21(i32 %X) {
%c1 = trunc i32 %X to i8 ; <i8> [#uses=1]
;; sext -> zext -> and -> nop
%c2 = sext i8 %c1 to i32 ; <i32> [#uses=1]
%RV = and i32 %c2, 255 ; <i32> [#uses=1]
ret i32 %RV
; CHECK: %c21 = and i32 %X, 255
; CHECK: ret i32 %c21
}
define i32 @test22(i32 %X) {
%c1 = trunc i32 %X to i8 ; <i8> [#uses=1]
;; sext -> zext -> and -> nop
%c2 = sext i8 %c1 to i32 ; <i32> [#uses=1]
%RV = shl i32 %c2, 24 ; <i32> [#uses=1]
ret i32 %RV
; CHECK: %RV = shl i32 %X, 24
; CHECK: ret i32 %RV
}
define i32 @test23(i32 %X) {
;; Turn into an AND even though X
%c1 = trunc i32 %X to i16 ; <i16> [#uses=1]
;; and Z are signed.
%c2 = zext i16 %c1 to i32 ; <i32> [#uses=1]
ret i32 %c2
; CHECK: %c2 = and i32 %X, 65535
; CHECK: ret i32 %c2
}
define i1 @test24(i1 %C) {
%X = select i1 %C, i32 14, i32 1234 ; <i32> [#uses=1]
;; Fold cast into select
%c = icmp ne i32 %X, 0 ; <i1> [#uses=1]
ret i1 %c
; CHECK: ret i1 true
}
define void @test25(i32** %P) {
%c = bitcast i32** %P to float** ; <float**> [#uses=1]
;; Fold cast into null
store float* null, float** %c
ret void
; CHECK: store i32* null, i32** %P
; CHECK: ret void
}
define i32 @test26(float %F) {
;; no need to cast from float->double.
%c = fpext float %F to double ; <double> [#uses=1]
%D = fptosi double %c to i32 ; <i32> [#uses=1]
ret i32 %D
; CHECK: %D = fptosi float %F to i32
; CHECK: ret i32 %D
}
define [4 x float]* @test27([9 x [4 x float]]* %A) {
%c = bitcast [9 x [4 x float]]* %A to [4 x float]* ; <[4 x float]*> [#uses=1]
ret [4 x float]* %c
; CHECK: %c = getelementptr inbounds [9 x [4 x float]]* %A, i64 0, i64 0
; CHECK: ret [4 x float]* %c
}
define float* @test28([4 x float]* %A) {
%c = bitcast [4 x float]* %A to float* ; <float*> [#uses=1]
ret float* %c
; CHECK: %c = getelementptr inbounds [4 x float]* %A, i64 0, i64 0
; CHECK: ret float* %c
}
define i32 @test29(i32 %c1, i32 %c2) {
%tmp1 = trunc i32 %c1 to i8 ; <i8> [#uses=1]
%tmp4.mask = trunc i32 %c2 to i8 ; <i8> [#uses=1]
%tmp = or i8 %tmp4.mask, %tmp1 ; <i8> [#uses=1]
%tmp10 = zext i8 %tmp to i32 ; <i32> [#uses=1]
ret i32 %tmp10
; CHECK: %tmp2 = or i32 %c2, %c1
; CHECK: %tmp10 = and i32 %tmp2, 255
; CHECK: ret i32 %tmp10
}
define i32 @test30(i32 %c1) {
%c2 = trunc i32 %c1 to i8 ; <i8> [#uses=1]
%c3 = xor i8 %c2, 1 ; <i8> [#uses=1]
%c4 = zext i8 %c3 to i32 ; <i32> [#uses=1]
ret i32 %c4
; CHECK: %c3 = and i32 %c1, 255
; CHECK: %c4 = xor i32 %c3, 1
; CHECK: ret i32 %c4
}
define i1 @test31(i64 %A) {
%B = trunc i64 %A to i32 ; <i32> [#uses=1]
%C = and i32 %B, 42 ; <i32> [#uses=1]
%D = icmp eq i32 %C, 10 ; <i1> [#uses=1]
ret i1 %D
; CHECK: %C1 = and i64 %A, 42
; CHECK: %D = icmp eq i64 %C1, 10
; CHECK: ret i1 %D
}
define void @test32(double** %tmp) {
%tmp8 = malloc [16 x i8] ; <[16 x i8]*> [#uses=1]
%tmp8.upgrd.1 = bitcast [16 x i8]* %tmp8 to double* ; <double*> [#uses=1]
store double* %tmp8.upgrd.1, double** %tmp
ret void
; CHECK: %tmp81 = malloc [2 x double]
; CHECK: %tmp81.sub = getelementptr inbounds [2 x double]* %tmp81, i64 0, i64 0
; CHECK: store double* %tmp81.sub, double** %tmp
; CHECK: ret void
}
define i32 @test33(i32 %c1) {
%x = bitcast i32 %c1 to float ; <float> [#uses=1]
%y = bitcast float %x to i32 ; <i32> [#uses=1]
ret i32 %y
; CHECK: ret i32 %c1
}
define i16 @test34(i16 %a) {
%c1 = zext i16 %a to i32 ; <i32> [#uses=1]
%tmp21 = lshr i32 %c1, 8 ; <i32> [#uses=1]
%c2 = trunc i32 %tmp21 to i16 ; <i16> [#uses=1]
ret i16 %c2
; CHECK: %tmp21 = lshr i16 %a, 8
; CHECK: ret i16 %tmp21
}
define i16 @test35(i16 %a) {
%c1 = bitcast i16 %a to i16 ; <i16> [#uses=1]
%tmp2 = lshr i16 %c1, 8 ; <i16> [#uses=1]
%c2 = bitcast i16 %tmp2 to i16 ; <i16> [#uses=1]
ret i16 %c2
; CHECK: %tmp2 = lshr i16 %a, 8
; CHECK: ret i16 %tmp2
}
; icmp sgt i32 %a, -1
; rdar://6480391
define i1 @test36(i32 %a) {
%b = lshr i32 %a, 31
%c = trunc i32 %b to i8
%d = icmp eq i8 %c, 0
ret i1 %d
; CHECK: %d = icmp sgt i32 %a, -1
; CHECK: ret i1 %d
}
; ret i1 false
define i1 @test37(i32 %a) {
%b = lshr i32 %a, 31
%c = or i32 %b, 512
%d = trunc i32 %c to i8
%e = icmp eq i8 %d, 11
ret i1 %e
; CHECK: ret i1 false
}
define i64 @test38(i32 %a) {
%1 = icmp eq i32 %a, -2
%2 = zext i1 %1 to i8
%3 = xor i8 %2, 1
%4 = zext i8 %3 to i64
ret i64 %4
; CHECK: %1 = icmp ne i32 %a, -2
; CHECK: %2 = zext i1 %1 to i64
; CHECK: ret i64 %2
}
|
