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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -instcombine -S < %s | FileCheck %s
; Given:
; icmp eq/ne (urem %x, C), 0
; Iff C is not a power of two (those should not get to here though),
; and %x may have at most one bit set, omit the 'urem':
; icmp eq/ne %x, 0
;------------------------------------------------------------------------------;
; Basic scalar tests
;------------------------------------------------------------------------------;
define i1 @p0_scalar_urem_by_const(i32 %x, i32 %y) {
; CHECK-LABEL: @p0_scalar_urem_by_const(
; CHECK-NEXT: [[T0:%.*]] = and i32 [[X:%.*]], 128
; CHECK-NEXT: [[T2:%.*]] = icmp eq i32 [[T0]], 0
; CHECK-NEXT: ret i1 [[T2]]
;
%t0 = and i32 %x, 128 ; clearly a power-of-two or zero
%t1 = urem i32 %t0, 6 ; '6' is clearly not a power of two
%t2 = icmp eq i32 %t1, 0
ret i1 %t2
}
define i1 @p1_scalar_urem_by_nonconst(i32 %x, i32 %y) {
; CHECK-LABEL: @p1_scalar_urem_by_nonconst(
; CHECK-NEXT: [[T0:%.*]] = and i32 [[X:%.*]], 128
; CHECK-NEXT: [[T3:%.*]] = icmp eq i32 [[T0]], 0
; CHECK-NEXT: ret i1 [[T3]]
;
%t0 = and i32 %x, 128 ; clearly a power-of-two or zero
%t1 = or i32 %y, 6 ; two bits set, clearly not a power of two
%t2 = urem i32 %t0, %t1
%t3 = icmp eq i32 %t2, 0
ret i1 %t3
}
define i1 @p2_scalar_shifted_urem_by_const(i32 %x, i32 %y) {
; CHECK-LABEL: @p2_scalar_shifted_urem_by_const(
; CHECK-NEXT: [[T0:%.*]] = and i32 [[X:%.*]], 1
; CHECK-NEXT: [[T1:%.*]] = shl i32 [[T0]], [[Y:%.*]]
; CHECK-NEXT: [[T2:%.*]] = urem i32 [[T1]], 3
; CHECK-NEXT: [[T3:%.*]] = icmp eq i32 [[T2]], 0
; CHECK-NEXT: ret i1 [[T3]]
;
%t0 = and i32 %x, 1 ; clearly a power-of-two or zero
%t1 = shl i32 %t0, %y ; will still be a power-of-two or zero with any %y
%t2 = urem i32 %t1, 3 ; '3' is clearly not a power of two
%t3 = icmp eq i32 %t2, 0
ret i1 %t3
}
define i1 @p3_scalar_shifted2_urem_by_const(i32 %x, i32 %y) {
; CHECK-LABEL: @p3_scalar_shifted2_urem_by_const(
; CHECK-NEXT: [[T0:%.*]] = and i32 [[X:%.*]], 2
; CHECK-NEXT: [[T1:%.*]] = shl i32 [[T0]], [[Y:%.*]]
; CHECK-NEXT: [[T2:%.*]] = urem i32 [[T1]], 3
; CHECK-NEXT: [[T3:%.*]] = icmp eq i32 [[T2]], 0
; CHECK-NEXT: ret i1 [[T3]]
;
%t0 = and i32 %x, 2 ; clearly a power-of-two or zero
%t1 = shl i32 %t0, %y ; will still be a power-of-two or zero with any %y
%t2 = urem i32 %t1, 3 ; '3' is clearly not a power of two
%t3 = icmp eq i32 %t2, 0
ret i1 %t3
}
;------------------------------------------------------------------------------;
; Basic vector tests
;------------------------------------------------------------------------------;
define <4 x i1> @p4_vector_urem_by_const__splat(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p4_vector_urem_by_const__splat(
; CHECK-NEXT: [[T0:%.*]] = and <4 x i32> [[X:%.*]], <i32 128, i32 128, i32 128, i32 128>
; CHECK-NEXT: [[T2:%.*]] = icmp eq <4 x i32> [[T0]], zeroinitializer
; CHECK-NEXT: ret <4 x i1> [[T2]]
;
%t0 = and <4 x i32> %x, <i32 128, i32 128, i32 128, i32 128> ; clearly a power-of-two or zero
%t1 = urem <4 x i32> %t0, <i32 6, i32 6, i32 6, i32 6> ; '6' is clearly not a power of two
%t2 = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 0, i32 0>
ret <4 x i1> %t2
}
define <4 x i1> @p5_vector_urem_by_const__nonsplat(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p5_vector_urem_by_const__nonsplat(
; CHECK-NEXT: [[T0:%.*]] = and <4 x i32> [[X:%.*]], <i32 128, i32 2, i32 4, i32 8>
; CHECK-NEXT: [[T1:%.*]] = urem <4 x i32> [[T0]], <i32 3, i32 5, i32 6, i32 9>
; CHECK-NEXT: [[T2:%.*]] = icmp eq <4 x i32> [[T1]], zeroinitializer
; CHECK-NEXT: ret <4 x i1> [[T2]]
;
%t0 = and <4 x i32> %x, <i32 128, i32 2, i32 4, i32 8>
%t1 = urem <4 x i32> %t0, <i32 3, i32 5, i32 6, i32 9>
%t2 = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 0, i32 0>
ret <4 x i1> %t2
}
define <4 x i1> @p6_vector_urem_by_const__nonsplat_undef0(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p6_vector_urem_by_const__nonsplat_undef0(
; CHECK-NEXT: [[T0:%.*]] = and <4 x i32> [[X:%.*]], <i32 128, i32 128, i32 undef, i32 128>
; CHECK-NEXT: [[T1:%.*]] = urem <4 x i32> [[T0]], <i32 6, i32 6, i32 6, i32 6>
; CHECK-NEXT: [[T2:%.*]] = icmp eq <4 x i32> [[T1]], zeroinitializer
; CHECK-NEXT: ret <4 x i1> [[T2]]
;
%t0 = and <4 x i32> %x, <i32 128, i32 128, i32 undef, i32 128>
%t1 = urem <4 x i32> %t0, <i32 6, i32 6, i32 6, i32 6> ; '6' is clearly not a power of two
%t2 = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 0, i32 0>
ret <4 x i1> %t2
}
define <4 x i1> @p7_vector_urem_by_const__nonsplat_undef2(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p7_vector_urem_by_const__nonsplat_undef2(
; CHECK-NEXT: [[T0:%.*]] = and <4 x i32> [[X:%.*]], <i32 128, i32 128, i32 128, i32 128>
; CHECK-NEXT: [[T2:%.*]] = icmp eq <4 x i32> [[T0]], <i32 0, i32 0, i32 undef, i32 0>
; CHECK-NEXT: ret <4 x i1> [[T2]]
;
%t0 = and <4 x i32> %x, <i32 128, i32 128, i32 128, i32 128> ; clearly a power-of-two or zero
%t1 = urem <4 x i32> %t0, <i32 6, i32 6, i32 6, i32 6> ; '6' is clearly not a power of two
%t2 = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 undef, i32 0>
ret <4 x i1> %t2
}
define <4 x i1> @p8_vector_urem_by_const__nonsplat_undef3(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p8_vector_urem_by_const__nonsplat_undef3(
; CHECK-NEXT: [[T0:%.*]] = and <4 x i32> [[X:%.*]], <i32 128, i32 128, i32 undef, i32 128>
; CHECK-NEXT: [[T1:%.*]] = urem <4 x i32> [[T0]], <i32 6, i32 6, i32 6, i32 6>
; CHECK-NEXT: [[T2:%.*]] = icmp eq <4 x i32> [[T1]], <i32 0, i32 0, i32 undef, i32 0>
; CHECK-NEXT: ret <4 x i1> [[T2]]
;
%t0 = and <4 x i32> %x, <i32 128, i32 128, i32 undef, i32 128>
%t1 = urem <4 x i32> %t0, <i32 6, i32 6, i32 6, i32 6> ; '6' is clearly not a power of two
%t2 = icmp eq <4 x i32> %t1, <i32 0, i32 0, i32 undef, i32 0>
ret <4 x i1> %t2
}
;------------------------------------------------------------------------------;
; Basic negative tests
;------------------------------------------------------------------------------;
define i1 @n0_urem_of_maybe_not_power_of_two(i32 %x, i32 %y) {
; CHECK-LABEL: @n0_urem_of_maybe_not_power_of_two(
; CHECK-NEXT: [[T0:%.*]] = and i32 [[X:%.*]], 3
; CHECK-NEXT: [[T1:%.*]] = urem i32 [[T0]], 3
; CHECK-NEXT: [[T2:%.*]] = icmp eq i32 [[T1]], 0
; CHECK-NEXT: ret i1 [[T2]]
;
%t0 = and i32 %x, 3 ; up to two bits set, not power-of-two
%t1 = urem i32 %t0, 3
%t2 = icmp eq i32 %t1, 0
ret i1 %t2
}
define i1 @n1_urem_by_maybe_power_of_two(i32 %x, i32 %y) {
; CHECK-LABEL: @n1_urem_by_maybe_power_of_two(
; CHECK-NEXT: [[T0:%.*]] = and i32 [[X:%.*]], 128
; CHECK-NEXT: [[T1:%.*]] = or i32 [[Y:%.*]], 1
; CHECK-NEXT: [[T2:%.*]] = urem i32 [[T0]], [[T1]]
; CHECK-NEXT: [[T3:%.*]] = icmp eq i32 [[T2]], 0
; CHECK-NEXT: ret i1 [[T3]]
;
%t0 = and i32 %x, 128 ; clearly a power-of-two or zero
%t1 = or i32 %y, 1 ; one low bit set, may be a power of two
%t2 = urem i32 %t0, %t1
%t3 = icmp eq i32 %t2, 0
ret i1 %t3
}
|
