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
| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -instcombine -S | FileCheck %s
; https://bugs.llvm.org/show_bug.cgi?id=38446
; Pattern:
; ~(x ^ y)
; Should be transformed into:
; (~x) ^ y
; or into
; x ^ (~y)
; While -reassociate does handle this simple pattern, it does not handle
; the more complicated motivating pattern.
; ============================================================================ ;
; Basic positive tests
; ============================================================================ ;
; If the operand is easily-invertible, fold into it.
declare i1 @gen1()
define i1 @positive_easyinvert(i16 %x, i8 %y) {
; CHECK-LABEL: @positive_easyinvert(
; CHECK-NEXT: [[TMP1:%.*]] = icmp slt i16 [[X:%.*]], 0
; CHECK-NEXT: [[TMP2:%.*]] = icmp sgt i8 [[Y:%.*]], -1
; CHECK-NEXT: [[TMP4:%.*]] = xor i1 [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret i1 [[TMP4]]
;
%tmp1 = icmp slt i16 %x, 0
%tmp2 = icmp slt i8 %y, 0
%tmp3 = xor i1 %tmp2, %tmp1
%tmp4 = xor i1 %tmp3, true
ret i1 %tmp4
}
define i1 @positive_easyinvert0(i8 %y) {
; CHECK-LABEL: @positive_easyinvert0(
; CHECK-NEXT: [[TMP1:%.*]] = call i1 @gen1()
; CHECK-NEXT: [[TMP2:%.*]] = icmp sgt i8 [[Y:%.*]], -1
; CHECK-NEXT: [[TMP4:%.*]] = xor i1 [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret i1 [[TMP4]]
;
%tmp1 = call i1 @gen1()
%tmp2 = icmp slt i8 %y, 0
%tmp3 = xor i1 %tmp2, %tmp1
%tmp4 = xor i1 %tmp3, true
ret i1 %tmp4
}
define i1 @positive_easyinvert1(i8 %y) {
; CHECK-LABEL: @positive_easyinvert1(
; CHECK-NEXT: [[TMP1:%.*]] = call i1 @gen1()
; CHECK-NEXT: [[TMP2:%.*]] = icmp sgt i8 [[Y:%.*]], -1
; CHECK-NEXT: [[TMP4:%.*]] = xor i1 [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret i1 [[TMP4]]
;
%tmp1 = call i1 @gen1()
%tmp2 = icmp slt i8 %y, 0
%tmp3 = xor i1 %tmp1, %tmp2
%tmp4 = xor i1 %tmp3, true
ret i1 %tmp4
}
; ============================================================================ ;
; One-use tests with easily-invertible operand.
; ============================================================================ ;
declare void @use1(i1)
define i1 @oneuse_easyinvert_0(i8 %y) {
; CHECK-LABEL: @oneuse_easyinvert_0(
; CHECK-NEXT: [[TMP1:%.*]] = call i1 @gen1()
; CHECK-NEXT: [[TMP2:%.*]] = icmp slt i8 [[Y:%.*]], 0
; CHECK-NEXT: call void @use1(i1 [[TMP2]])
; CHECK-NEXT: [[TMP3:%.*]] = xor i1 [[TMP1]], [[TMP2]]
; CHECK-NEXT: [[TMP4:%.*]] = xor i1 [[TMP3]], true
; CHECK-NEXT: ret i1 [[TMP4]]
;
%tmp1 = call i1 @gen1()
%tmp2 = icmp slt i8 %y, 0
call void @use1(i1 %tmp2)
%tmp3 = xor i1 %tmp1, %tmp2
%tmp4 = xor i1 %tmp3, true
ret i1 %tmp4
}
define i1 @oneuse_easyinvert_1(i8 %y) {
; CHECK-LABEL: @oneuse_easyinvert_1(
; CHECK-NEXT: [[TMP1:%.*]] = call i1 @gen1()
; CHECK-NEXT: [[TMP2:%.*]] = icmp slt i8 [[Y:%.*]], 0
; CHECK-NEXT: [[TMP3:%.*]] = xor i1 [[TMP1]], [[TMP2]]
; CHECK-NEXT: call void @use1(i1 [[TMP3]])
; CHECK-NEXT: [[TMP4:%.*]] = xor i1 [[TMP3]], true
; CHECK-NEXT: ret i1 [[TMP4]]
;
%tmp1 = call i1 @gen1()
%tmp2 = icmp slt i8 %y, 0
%tmp3 = xor i1 %tmp1, %tmp2
call void @use1(i1 %tmp3)
%tmp4 = xor i1 %tmp3, true
ret i1 %tmp4
}
define i1 @oneuse_easyinvert_2(i8 %y) {
; CHECK-LABEL: @oneuse_easyinvert_2(
; CHECK-NEXT: [[TMP1:%.*]] = call i1 @gen1()
; CHECK-NEXT: [[TMP2:%.*]] = icmp slt i8 [[Y:%.*]], 0
; CHECK-NEXT: call void @use1(i1 [[TMP2]])
; CHECK-NEXT: [[TMP3:%.*]] = xor i1 [[TMP1]], [[TMP2]]
; CHECK-NEXT: call void @use1(i1 [[TMP3]])
; CHECK-NEXT: [[TMP4:%.*]] = xor i1 [[TMP3]], true
; CHECK-NEXT: ret i1 [[TMP4]]
;
%tmp1 = call i1 @gen1()
%tmp2 = icmp slt i8 %y, 0
call void @use1(i1 %tmp2)
%tmp3 = xor i1 %tmp1, %tmp2
call void @use1(i1 %tmp3)
%tmp4 = xor i1 %tmp3, true
ret i1 %tmp4
}
; ============================================================================ ;
; Negative tests
; ============================================================================ ;
; Not easily invertible.
define i32 @negative(i32 %x, i32 %y) {
; CHECK-LABEL: @negative(
; CHECK-NEXT: [[TMP1:%.*]] = xor i32 [[X:%.*]], [[Y:%.*]]
; CHECK-NEXT: [[TMP2:%.*]] = xor i32 [[TMP1]], -1
; CHECK-NEXT: ret i32 [[TMP2]]
;
%tmp1 = xor i32 %x, %y
%tmp2 = xor i32 %tmp1, -1
ret i32 %tmp2
}
|