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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -passes=instcombine | FileCheck %s
;
; Canonicalize ((X & -X) - 1) --> ((X - 1) & ~X)
;
define i32 @dec_mask_neg_i32(i32 %X) {
; CHECK-LABEL: @dec_mask_neg_i32(
; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[X:%.*]], -1
; CHECK-NEXT: [[TMP2:%.*]] = xor i32 [[X]], -1
; CHECK-NEXT: [[DEC:%.*]] = and i32 [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret i32 [[DEC]]
;
%neg = sub i32 0, %X
%mask = and i32 %neg, %X
%dec = add i32 %mask, -1
ret i32 %dec
}
define i32 @dec_mask_commute_neg_i32(i32 %A) {
; CHECK-LABEL: @dec_mask_commute_neg_i32(
; CHECK-NEXT: [[X:%.*]] = sdiv i32 42, [[A:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = add nsw i32 [[X]], -1
; CHECK-NEXT: [[TMP2:%.*]] = xor i32 [[X]], -1
; CHECK-NEXT: [[DEC:%.*]] = and i32 [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret i32 [[DEC]]
;
%X = sdiv i32 42, %A ; thwart complexity-based canonicalization
%neg = sub i32 0, %X
%mask = and i32 %X, %neg
%dec = add i32 %mask, -1
ret i32 %dec
}
define i32 @dec_commute_mask_neg_i32(i32 %X) {
; CHECK-LABEL: @dec_commute_mask_neg_i32(
; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[X:%.*]], -1
; CHECK-NEXT: [[TMP2:%.*]] = xor i32 [[X]], -1
; CHECK-NEXT: [[DEC:%.*]] = and i32 [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret i32 [[DEC]]
;
%neg = sub i32 0, %X
%mask = and i32 %neg, %X
%dec = add i32 -1, %mask
ret i32 %dec
}
define i32 @dec_mask_neg_multiuse_i32(i32 %X) {
; CHECK-LABEL: @dec_mask_neg_multiuse_i32(
; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = and i32 [[X]], [[NEG]]
; CHECK-NEXT: [[DEC:%.*]] = add i32 [[MASK]], -1
; CHECK-NEXT: call void @use(i32 [[NEG]])
; CHECK-NEXT: ret i32 [[DEC]]
;
%neg = sub i32 0, %X
%mask = and i32 %neg, %X
%dec = add i32 %mask, -1
call void @use(i32 %neg)
ret i32 %dec
}
define i32 @dec_mask_multiuse_neg_i32(i32 %X) {
; CHECK-LABEL: @dec_mask_multiuse_neg_i32(
; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = and i32 [[X]], [[NEG]]
; CHECK-NEXT: [[DEC:%.*]] = add i32 [[MASK]], -1
; CHECK-NEXT: call void @use(i32 [[MASK]])
; CHECK-NEXT: ret i32 [[DEC]]
;
%neg = sub i32 0, %X
%mask = and i32 %neg, %X
%dec = add i32 %mask, -1
call void @use(i32 %mask)
ret i32 %dec
}
define <2 x i32> @dec_mask_neg_v2i32(<2 x i32> %X) {
; CHECK-LABEL: @dec_mask_neg_v2i32(
; CHECK-NEXT: [[TMP1:%.*]] = add <2 x i32> [[X:%.*]], splat (i32 -1)
; CHECK-NEXT: [[TMP2:%.*]] = xor <2 x i32> [[X]], splat (i32 -1)
; CHECK-NEXT: [[DEC:%.*]] = and <2 x i32> [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret <2 x i32> [[DEC]]
;
%neg = sub <2 x i32> zeroinitializer, %X
%mask = and <2 x i32> %neg, %X
%dec = add <2 x i32> %mask, <i32 -1, i32 -1>
ret <2 x i32> %dec
}
define <2 x i32> @dec_mask_neg_v2i32_poison(<2 x i32> %X) {
; CHECK-LABEL: @dec_mask_neg_v2i32_poison(
; CHECK-NEXT: [[TMP1:%.*]] = add <2 x i32> [[X:%.*]], splat (i32 -1)
; CHECK-NEXT: [[TMP2:%.*]] = xor <2 x i32> [[X]], splat (i32 -1)
; CHECK-NEXT: [[DEC:%.*]] = and <2 x i32> [[TMP1]], [[TMP2]]
; CHECK-NEXT: ret <2 x i32> [[DEC]]
;
%neg = sub <2 x i32> zeroinitializer, %X
%mask = and <2 x i32> %neg, %X
%dec = add <2 x i32> %mask, <i32 -1, i32 poison>
ret <2 x i32> %dec
}
define <2 x i32> @dec_mask_multiuse_neg_multiuse_v2i32(<2 x i32> %X) {
; CHECK-LABEL: @dec_mask_multiuse_neg_multiuse_v2i32(
; CHECK-NEXT: [[NEG:%.*]] = sub <2 x i32> zeroinitializer, [[X:%.*]]
; CHECK-NEXT: [[MASK:%.*]] = and <2 x i32> [[X]], [[NEG]]
; CHECK-NEXT: [[DEC:%.*]] = add <2 x i32> [[MASK]], splat (i32 -1)
; CHECK-NEXT: call void @usev(<2 x i32> [[NEG]])
; CHECK-NEXT: call void @usev(<2 x i32> [[MASK]])
; CHECK-NEXT: ret <2 x i32> [[DEC]]
;
%neg = sub <2 x i32> zeroinitializer, %X
%mask = and <2 x i32> %neg, %X
%dec = add <2 x i32> %mask, <i32 -1, i32 -1>
call void @usev(<2 x i32> %neg)
call void @usev(<2 x i32> %mask)
ret <2 x i32> %dec
}
declare void @use(i32)
declare void @usev(<2 x i32>)
|
