shl-lshr-differentconstmask.ll
5.33 KB
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
; NOTE: Assertions have been autogenerated by utils/update_analyze_test_checks.py
; RUN: opt -S -analyze -enable-new-pm=0 -scalar-evolution < %s | FileCheck %s
; RUN: opt -S -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s
; The obvious case.
define i32 @mul_biggerShl(i32 %val) nounwind {
; CHECK-LABEL: 'mul_biggerShl'
; CHECK-NEXT: Classifying expressions for: @mul_biggerShl
; CHECK-NEXT: %tmp1 = mul i32 %val, 64
; CHECK-NEXT: --> (64 * %val) U: [0,-63) S: [-2147483648,2147483585)
; CHECK-NEXT: %tmp2 = udiv i32 %tmp1, 16
; CHECK-NEXT: --> ((64 * %val) /u 16) U: [0,268435453) S: [0,268435456)
; CHECK-NEXT: Determining loop execution counts for: @mul_biggerShl
;
%tmp1 = mul i32 %val, 64
%tmp2 = udiv i32 %tmp1, 16
ret i32 %tmp2
}
define i32 @mul_biggerLshl(i32 %val) nounwind {
; CHECK-LABEL: 'mul_biggerLshl'
; CHECK-NEXT: Classifying expressions for: @mul_biggerLshl
; CHECK-NEXT: %tmp1 = mul i32 %val, 16
; CHECK-NEXT: --> (16 * %val) U: [0,-15) S: [-2147483648,2147483633)
; CHECK-NEXT: %tmp2 = udiv i32 %tmp1, 64
; CHECK-NEXT: --> ((16 * %val) /u 64) U: [0,67108864) S: [0,67108864)
; CHECK-NEXT: Determining loop execution counts for: @mul_biggerLshl
;
%tmp1 = mul i32 %val, 16
%tmp2 = udiv i32 %tmp1, 64
ret i32 %tmp2
}
; Or, it could have been transformed to shifts
define i32 @shifty_biggerShl(i32 %val) {
; CHECK-LABEL: 'shifty_biggerShl'
; CHECK-NEXT: Classifying expressions for: @shifty_biggerShl
; CHECK-NEXT: %tmp1 = shl i32 %val, 6
; CHECK-NEXT: --> (64 * %val) U: [0,-63) S: [-2147483648,2147483585)
; CHECK-NEXT: %tmp2 = lshr i32 %tmp1, 4
; CHECK-NEXT: --> ((64 * %val) /u 16) U: [0,268435453) S: [0,268435456)
; CHECK-NEXT: Determining loop execution counts for: @shifty_biggerShl
;
%tmp1 = shl i32 %val, 6
%tmp2 = lshr i32 %tmp1, 4
ret i32 %tmp2
}
define i32 @shifty_biggerShl_shlnuw(i32 %val) {
; CHECK-LABEL: 'shifty_biggerShl_shlnuw'
; CHECK-NEXT: Classifying expressions for: @shifty_biggerShl_shlnuw
; CHECK-NEXT: %tmp1 = shl nuw i32 %val, 6
; CHECK-NEXT: --> (64 * %val) U: [0,-63) S: [-2147483648,2147483585)
; CHECK-NEXT: %tmp2 = lshr i32 %tmp1, 4
; CHECK-NEXT: --> ((64 * %val) /u 16) U: [0,268435453) S: [0,268435456)
; CHECK-NEXT: Determining loop execution counts for: @shifty_biggerShl_shlnuw
;
%tmp1 = shl nuw i32 %val, 6
%tmp2 = lshr i32 %tmp1, 4
ret i32 %tmp2
}
define i32 @shifty_biggerLshr(i32 %val) {
; CHECK-LABEL: 'shifty_biggerLshr'
; CHECK-NEXT: Classifying expressions for: @shifty_biggerLshr
; CHECK-NEXT: %tmp1 = shl i32 %val, 4
; CHECK-NEXT: --> (16 * %val) U: [0,-15) S: [-2147483648,2147483633)
; CHECK-NEXT: %tmp2 = lshr i32 %tmp1, 6
; CHECK-NEXT: --> ((16 * %val) /u 64) U: [0,67108864) S: [0,67108864)
; CHECK-NEXT: Determining loop execution counts for: @shifty_biggerLshr
;
%tmp1 = shl i32 %val, 4
%tmp2 = lshr i32 %tmp1, 6
ret i32 %tmp2
}
define i32 @shifty_biggerLshr_shlnuw(i32 %val) {
; CHECK-LABEL: 'shifty_biggerLshr_shlnuw'
; CHECK-NEXT: Classifying expressions for: @shifty_biggerLshr_shlnuw
; CHECK-NEXT: %tmp1 = shl nuw i32 %val, 4
; CHECK-NEXT: --> (16 * %val) U: [0,-15) S: [-2147483648,2147483633)
; CHECK-NEXT: %tmp2 = lshr i32 %tmp1, 6
; CHECK-NEXT: --> ((16 * %val) /u 64) U: [0,67108864) S: [0,67108864)
; CHECK-NEXT: Determining loop execution counts for: @shifty_biggerLshr_shlnuw
;
%tmp1 = shl nuw i32 %val, 4
%tmp2 = lshr i32 %tmp1, 6
ret i32 %tmp2
}
; Or, further folded into mask variant.
define i32 @masky_biggerShl(i32 %val) {
; CHECK-LABEL: 'masky_biggerShl'
; CHECK-NEXT: Classifying expressions for: @masky_biggerShl
; CHECK-NEXT: %tmp1 = shl i32 %val, 2
; CHECK-NEXT: --> (4 * %val) U: [0,-3) S: [-2147483648,2147483645)
; CHECK-NEXT: %tmp2 = and i32 %tmp1, 268435452
; CHECK-NEXT: --> (4 * (zext i26 (trunc i32 %val to i26) to i32))<nuw><nsw> U: [0,268435453) S: [0,268435453)
; CHECK-NEXT: Determining loop execution counts for: @masky_biggerShl
;
%tmp1 = shl i32 %val, 2
%tmp2 = and i32 %tmp1, 268435452
ret i32 %tmp2
}
define i32 @masky_biggerShl_shlnuw(i32 %val) {
; CHECK-LABEL: 'masky_biggerShl_shlnuw'
; CHECK-NEXT: Classifying expressions for: @masky_biggerShl_shlnuw
; CHECK-NEXT: %tmp1 = shl nuw i32 %val, 2
; CHECK-NEXT: --> (4 * %val) U: [0,-3) S: [-2147483648,2147483645)
; CHECK-NEXT: Determining loop execution counts for: @masky_biggerShl_shlnuw
;
%tmp1 = shl nuw i32 %val, 2
ret i32 %tmp1
}
define i32 @masky_biggerLshr(i32 %val) {
; CHECK-LABEL: 'masky_biggerLshr'
; CHECK-NEXT: Classifying expressions for: @masky_biggerLshr
; CHECK-NEXT: %tmp1 = lshr i32 %val, 2
; CHECK-NEXT: --> (%val /u 4) U: [0,1073741824) S: [0,1073741824)
; CHECK-NEXT: %tmp2 = and i32 %tmp1, 67108863
; CHECK-NEXT: --> (zext i26 (trunc i32 (%val /u 4) to i26) to i32) U: [0,67108864) S: [0,67108864)
; CHECK-NEXT: Determining loop execution counts for: @masky_biggerLshr
;
%tmp1 = lshr i32 %val, 2
%tmp2 = and i32 %tmp1, 67108863
ret i32 %tmp2
}
define i32 @masky_biggerLshr_shlnuw(i32 %val) {
; CHECK-LABEL: 'masky_biggerLshr_shlnuw'
; CHECK-NEXT: Classifying expressions for: @masky_biggerLshr_shlnuw
; CHECK-NEXT: %tmp1 = lshr i32 %val, 2
; CHECK-NEXT: --> (%val /u 4) U: [0,1073741824) S: [0,1073741824)
; CHECK-NEXT: Determining loop execution counts for: @masky_biggerLshr_shlnuw
;
%tmp1 = lshr i32 %val, 2
ret i32 %tmp1
}