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
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=instcombine %s -S -o - | FileCheck %s
; Scalar Types
define i32 @neg_or_lshr_i32(i32 %x) {
; CHECK-LABEL: @neg_or_lshr_i32(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[X:%.*]], 0
; CHECK-NEXT: [[SHR:%.*]] = zext i1 [[TMP1]] to i32
; CHECK-NEXT: ret i32 [[SHR]]
;
%neg = sub i32 0, %x
%or = or i32 %neg, %x
%shr = lshr i32 %or, 31
ret i32 %shr
}
; Commute
define i32 @neg_or_lshr_i32_commute(i32 %x0) {
; CHECK-LABEL: @neg_or_lshr_i32_commute(
; CHECK-NEXT: [[X:%.*]] = sdiv i32 42, [[X0:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[X]], 0
; CHECK-NEXT: [[SHR:%.*]] = zext i1 [[TMP1]] to i32
; CHECK-NEXT: ret i32 [[SHR]]
;
%x = sdiv i32 42, %x0 ; thwart complexity-based canonicalization
%neg = sub i32 0, %x
%or = or i32 %x, %neg
%shr = lshr i32 %or, 31
ret i32 %shr
}
; Vector Types
define <4 x i32> @neg_or_lshr_i32_vec(<4 x i32> %x) {
; CHECK-LABEL: @neg_or_lshr_i32_vec(
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne <4 x i32> [[X:%.*]], zeroinitializer
; CHECK-NEXT: [[SHR:%.*]] = zext <4 x i1> [[TMP1]] to <4 x i32>
; CHECK-NEXT: ret <4 x i32> [[SHR]]
;
%neg = sub <4 x i32> zeroinitializer, %x
%or = or <4 x i32> %neg, %x
%shr = lshr <4 x i32> %or, <i32 31, i32 31, i32 31, i32 31>
ret <4 x i32> %shr
}
define <4 x i32> @neg_or_lshr_i32_vec_commute(<4 x i32> %x0) {
; CHECK-LABEL: @neg_or_lshr_i32_vec_commute(
; CHECK-NEXT: [[X:%.*]] = sdiv <4 x i32> <i32 42, i32 42, i32 42, i32 42>, [[X0:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne <4 x i32> [[X]], zeroinitializer
; CHECK-NEXT: [[SHR:%.*]] = zext <4 x i1> [[TMP1]] to <4 x i32>
; CHECK-NEXT: ret <4 x i32> [[SHR]]
;
%x = sdiv <4 x i32> <i32 42, i32 42, i32 42, i32 42>, %x0 ; thwart complexity-based canonicalization
%neg = sub <4 x i32> zeroinitializer, %x
%or = or <4 x i32> %x, %neg
%shr = lshr <4 x i32> %or, <i32 31, i32 31, i32 31, i32 31>
ret <4 x i32> %shr
}
; Extra uses
define i32 @neg_extra_use_or_lshr_i32(i32 %x, ptr %p) {
; CHECK-LABEL: @neg_extra_use_or_lshr_i32(
; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]]
; CHECK-NEXT: [[TMP1:%.*]] = icmp ne i32 [[X]], 0
; CHECK-NEXT: [[SHR:%.*]] = zext i1 [[TMP1]] to i32
; CHECK-NEXT: store i32 [[NEG]], ptr [[P:%.*]], align 4
; CHECK-NEXT: ret i32 [[SHR]]
;
%neg = sub i32 0, %x
%or = or i32 %neg, %x
%shr = lshr i32 %or, 31
store i32 %neg, ptr %p
ret i32 %shr
}
; Negative Tests
define i32 @neg_or_extra_use_lshr_i32(i32 %x, ptr %p) {
; CHECK-LABEL: @neg_or_extra_use_lshr_i32(
; CHECK-NEXT: [[NEG:%.*]] = sub i32 0, [[X:%.*]]
; CHECK-NEXT: [[OR:%.*]] = or i32 [[NEG]], [[X]]
; CHECK-NEXT: [[SHR:%.*]] = lshr i32 [[OR]], 31
; CHECK-NEXT: store i32 [[OR]], ptr [[P:%.*]], align 4
; CHECK-NEXT: ret i32 [[SHR]]
;
%neg = sub i32 0, %x
%or = or i32 %neg, %x
%shr = lshr i32 %or, 31
store i32 %or, ptr %p
ret i32 %shr
}
|
