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
| ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -instcombine -S < %s | FileCheck %s
; Given:
; sub %y, (xor %x, -1)
; Transform it to:
; add (add %x, 1), %y
; We prefer this form because that is what -reassociate would produce.
;------------------------------------------------------------------------------;
; Scalar tests
;------------------------------------------------------------------------------;
define i32 @p0_scalar(i32 %x, i32 %y) {
; CHECK-LABEL: @p0_scalar(
; CHECK-NEXT: [[TMP1:%.*]] = add i32 [[Y:%.*]], 1
; CHECK-NEXT: [[T1:%.*]] = add i32 [[TMP1]], [[X:%.*]]
; CHECK-NEXT: ret i32 [[T1]]
;
%t0 = xor i32 %x, -1
%t1 = sub i32 %y, %t0
ret i32 %t1
}
;------------------------------------------------------------------------------;
; Vector tests
;------------------------------------------------------------------------------;
define <4 x i32> @p1_vector_splat(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p1_vector_splat(
; CHECK-NEXT: [[TMP1:%.*]] = add <4 x i32> [[Y:%.*]], <i32 1, i32 1, i32 1, i32 1>
; CHECK-NEXT: [[T1:%.*]] = add <4 x i32> [[TMP1]], [[X:%.*]]
; CHECK-NEXT: ret <4 x i32> [[T1]]
;
%t0 = xor <4 x i32> %x, <i32 -1, i32 -1, i32 -1, i32 -1>
%t1 = sub <4 x i32> %y, %t0
ret <4 x i32> %t1
}
define <4 x i32> @p2_vector_undef(<4 x i32> %x, <4 x i32> %y) {
; CHECK-LABEL: @p2_vector_undef(
; CHECK-NEXT: [[TMP1:%.*]] = add <4 x i32> [[Y:%.*]], <i32 1, i32 1, i32 1, i32 1>
; CHECK-NEXT: [[T1:%.*]] = add <4 x i32> [[TMP1]], [[X:%.*]]
; CHECK-NEXT: ret <4 x i32> [[T1]]
;
%t0 = xor <4 x i32> %x, <i32 -1, i32 -1, i32 undef, i32 -1>
%t1 = sub <4 x i32> %y, %t0
ret <4 x i32> %t1
}
;------------------------------------------------------------------------------;
; One-use test
;------------------------------------------------------------------------------;
declare void @use32(i32)
define i32 @p3_oneuse(i32 %x, i32 %y) {
; CHECK-LABEL: @p3_oneuse(
; CHECK-NEXT: [[T0:%.*]] = xor i32 [[X:%.*]], -1
; CHECK-NEXT: call void @use32(i32 [[T0]])
; CHECK-NEXT: [[T1:%.*]] = sub i32 [[Y:%.*]], [[T0]]
; CHECK-NEXT: ret i32 [[T1]]
;
%t0 = xor i32 %x, -1
call void @use32(i32 %t0)
%t1 = sub i32 %y, %t0
ret i32 %t1
}
;------------------------------------------------------------------------------;
; Basic negative tests
;------------------------------------------------------------------------------;
; The `sub` (and the fold) is not commutative.
define i32 @n4(i32 %x, i32 %y) {
; CHECK-LABEL: @n4(
; CHECK-NEXT: [[T0:%.*]] = xor i32 [[X:%.*]], -1
; CHECK-NEXT: [[T1:%.*]] = sub i32 [[T0]], [[Y:%.*]]
; CHECK-NEXT: ret i32 [[T1]]
;
%t0 = xor i32 %x, -1
%t1 = sub i32 %t0, %y ; swapped
ret i32 %t1
}
define i32 @n5_is_not_not(i32 %x, i32 %y) {
; CHECK-LABEL: @n5_is_not_not(
; CHECK-NEXT: [[T0:%.*]] = xor i32 [[X:%.*]], 2147483647
; CHECK-NEXT: [[T1:%.*]] = sub i32 [[Y:%.*]], [[T0]]
; CHECK-NEXT: ret i32 [[T1]]
;
%t0 = xor i32 %x, 2147483647 ; not -1
%t1 = sub i32 %y, %t0
ret i32 %t1
}
|