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
|
; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
; RUN: llc < %s -mtriple=aarch64-unknown-unknown | FileCheck %s
; Compare if negative and select of constants where one constant is zero.
define i32 @neg_sel_constants(i32 %a) {
; CHECK-LABEL: neg_sel_constants:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #5
; CHECK-NEXT: and w0, w8, w0, asr #31
; CHECK-NEXT: ret
%tmp.1 = icmp slt i32 %a, 0
%retval = select i1 %tmp.1, i32 5, i32 0
ret i32 %retval
}
; Compare if negative and select of constants where one constant is zero and the other is a single bit.
define i32 @neg_sel_special_constant(i32 %a) {
; CHECK-LABEL: neg_sel_special_constant:
; CHECK: // %bb.0:
; CHECK-NEXT: lsr w8, w0, #22
; CHECK-NEXT: and w0, w8, #0x200
; CHECK-NEXT: ret
%tmp.1 = icmp slt i32 %a, 0
%retval = select i1 %tmp.1, i32 512, i32 0
ret i32 %retval
}
; Compare if negative and select variable or zero.
define i32 @neg_sel_variable_and_zero(i32 %a, i32 %b) {
; CHECK-LABEL: neg_sel_variable_and_zero:
; CHECK: // %bb.0:
; CHECK-NEXT: and w0, w1, w0, asr #31
; CHECK-NEXT: ret
%tmp.1 = icmp slt i32 %a, 0
%retval = select i1 %tmp.1, i32 %b, i32 0
ret i32 %retval
}
; Compare if not positive and select the same variable as being compared: smin(a, 0).
define i32 @not_pos_sel_same_variable(i32 %a) {
; CHECK-LABEL: not_pos_sel_same_variable:
; CHECK: // %bb.0:
; CHECK-NEXT: and w0, w0, w0, asr #31
; CHECK-NEXT: ret
%tmp = icmp slt i32 %a, 1
%min = select i1 %tmp, i32 %a, i32 0
ret i32 %min
}
; Flipping the comparison condition can be handled by getting the bitwise not of the sign mask.
; Compare if positive and select of constants where one constant is zero.
define i32 @pos_sel_constants(i32 %a) {
; CHECK-LABEL: pos_sel_constants:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #5
; CHECK-NEXT: bic w0, w8, w0, asr #31
; CHECK-NEXT: ret
%tmp.1 = icmp sgt i32 %a, -1
%retval = select i1 %tmp.1, i32 5, i32 0
ret i32 %retval
}
; Compare if positive and select of constants where one constant is zero and the other is a single bit.
define i32 @pos_sel_special_constant(i32 %a) {
; CHECK-LABEL: pos_sel_special_constant:
; CHECK: // %bb.0:
; CHECK-NEXT: mov w8, #512
; CHECK-NEXT: bic w0, w8, w0, lsr #22
; CHECK-NEXT: ret
%tmp.1 = icmp sgt i32 %a, -1
%retval = select i1 %tmp.1, i32 512, i32 0
ret i32 %retval
}
; Compare if positive and select variable or zero.
define i32 @pos_sel_variable_and_zero(i32 %a, i32 %b) {
; CHECK-LABEL: pos_sel_variable_and_zero:
; CHECK: // %bb.0:
; CHECK-NEXT: bic w0, w1, w0, asr #31
; CHECK-NEXT: ret
%tmp.1 = icmp sgt i32 %a, -1
%retval = select i1 %tmp.1, i32 %b, i32 0
ret i32 %retval
}
; Compare if not negative or zero and select the same variable as being compared: smax(a, 0).
define i32 @not_neg_sel_same_variable(i32 %a) {
; CHECK-LABEL: not_neg_sel_same_variable:
; CHECK: // %bb.0:
; CHECK-NEXT: bic w0, w0, w0, asr #31
; CHECK-NEXT: ret
%tmp = icmp sgt i32 %a, 0
%min = select i1 %tmp, i32 %a, i32 0
ret i32 %min
}
; https://llvm.org/bugs/show_bug.cgi?id=31175
; ret = (x-y) > 0 ? x-y : 0
define i32 @PR31175(i32 %x, i32 %y) {
; CHECK-LABEL: PR31175:
; CHECK: // %bb.0:
; CHECK-NEXT: sub w8, w0, w1
; CHECK-NEXT: bic w0, w8, w8, asr #31
; CHECK-NEXT: ret
%sub = sub nsw i32 %x, %y
%cmp = icmp sgt i32 %sub, 0
%sel = select i1 %cmp, i32 %sub, i32 0
ret i32 %sel
}
|
