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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
|
; RUN: llc -verify-machineinstrs < %s -mtriple=aarch64-linux-gnu | FileCheck %s
; Note that this should be refactored (for efficiency if nothing else)
; when the PCS is implemented so we don't have to worry about the
; loads and stores.
@var_i32 = global i32 42
@var_i64 = global i64 0
; Add pure 12-bit immediates:
define void @add_small() {
; CHECK-LABEL: add_small:
; CHECK: add {{w[0-9]+}}, {{w[0-9]+}}, #4095
%val32 = load i32, i32* @var_i32
%newval32 = add i32 %val32, 4095
store i32 %newval32, i32* @var_i32
; CHECK: add {{x[0-9]+}}, {{x[0-9]+}}, #52
%val64 = load i64, i64* @var_i64
%newval64 = add i64 %val64, 52
store i64 %newval64, i64* @var_i64
ret void
}
; Make sure we grab the imm variant when the register operand
; can be implicitly zero-extend.
; We used to generate something horrible like this:
; wA = ldrb
; xB = ldimm 12
; xC = add xB, wA, uxtb
; whereas this can be achieved with:
; wA = ldrb
; xC = add xA, #12 ; <- xA implicitly zero extend wA.
define void @add_small_imm(i8* %p, i64* %q, i32 %b, i32* %addr) {
; CHECK-LABEL: add_small_imm:
entry:
; CHECK: ldrb w[[LOAD32:[0-9]+]], [x0]
%t = load i8, i8* %p
%promoted = zext i8 %t to i64
%zextt = zext i8 %t to i32
%add = add nuw i32 %zextt, %b
; CHECK: add [[ADD2:x[0-9]+]], x[[LOAD32]], #12
%add2 = add nuw i64 %promoted, 12
store i32 %add, i32* %addr
; CHECK: str [[ADD2]], [x1]
store i64 %add2, i64* %q
ret void
}
; Add 12-bit immediates, shifted left by 12 bits
define void @add_med() {
; CHECK-LABEL: add_med:
; CHECK: add {{w[0-9]+}}, {{w[0-9]+}}, {{#3567, lsl #12|#14610432}}
%val32 = load i32, i32* @var_i32
%newval32 = add i32 %val32, 14610432 ; =0xdef000
store i32 %newval32, i32* @var_i32
; CHECK: add {{x[0-9]+}}, {{x[0-9]+}}, {{#4095, lsl #12|#16773120}}
%val64 = load i64, i64* @var_i64
%newval64 = add i64 %val64, 16773120 ; =0xfff000
store i64 %newval64, i64* @var_i64
ret void
}
; Subtract 12-bit immediates
define void @sub_small() {
; CHECK-LABEL: sub_small:
; CHECK: sub {{w[0-9]+}}, {{w[0-9]+}}, #4095
%val32 = load i32, i32* @var_i32
%newval32 = sub i32 %val32, 4095
store i32 %newval32, i32* @var_i32
; CHECK: sub {{x[0-9]+}}, {{x[0-9]+}}, #52
%val64 = load i64, i64* @var_i64
%newval64 = sub i64 %val64, 52
store i64 %newval64, i64* @var_i64
ret void
}
; Subtract 12-bit immediates, shifted left by 12 bits
define void @sub_med() {
; CHECK-LABEL: sub_med:
; CHECK: sub {{w[0-9]+}}, {{w[0-9]+}}, {{#3567, lsl #12|#14610432}}
%val32 = load i32, i32* @var_i32
%newval32 = sub i32 %val32, 14610432 ; =0xdef000
store i32 %newval32, i32* @var_i32
; CHECK: sub {{x[0-9]+}}, {{x[0-9]+}}, {{#4095, lsl #12|#16773120}}
%val64 = load i64, i64* @var_i64
%newval64 = sub i64 %val64, 16773120 ; =0xfff000
store i64 %newval64, i64* @var_i64
ret void
}
define void @testing() {
; CHECK-LABEL: testing:
%val = load i32, i32* @var_i32
; CHECK: cmp {{w[0-9]+}}, #4095
; CHECK: b.ne [[RET:.?LBB[0-9]+_[0-9]+]]
%cmp_pos_small = icmp ne i32 %val, 4095
br i1 %cmp_pos_small, label %ret, label %test2
test2:
; CHECK: cmp {{w[0-9]+}}, {{#3567, lsl #12|#14610432}}
; CHECK: b.lo [[RET]]
%newval2 = add i32 %val, 1
store i32 %newval2, i32* @var_i32
%cmp_pos_big = icmp ult i32 %val, 14610432
br i1 %cmp_pos_big, label %ret, label %test3
test3:
; CHECK: cmp {{w[0-9]+}}, #123
; CHECK: b.lt [[RET]]
%newval3 = add i32 %val, 2
store i32 %newval3, i32* @var_i32
%cmp_pos_slt = icmp slt i32 %val, 123
br i1 %cmp_pos_slt, label %ret, label %test4
test4:
; CHECK: cmp {{w[0-9]+}}, #321
; CHECK: b.gt [[RET]]
%newval4 = add i32 %val, 3
store i32 %newval4, i32* @var_i32
%cmp_pos_sgt = icmp sgt i32 %val, 321
br i1 %cmp_pos_sgt, label %ret, label %test5
test5:
; CHECK: cmn {{w[0-9]+}}, #444
; CHECK: b.gt [[RET]]
%newval5 = add i32 %val, 4
store i32 %newval5, i32* @var_i32
%cmp_neg_uge = icmp sgt i32 %val, -444
br i1 %cmp_neg_uge, label %ret, label %test6
test6:
%newval6 = add i32 %val, 5
store i32 %newval6, i32* @var_i32
ret void
ret:
ret void
}
; TODO: adds/subs
|
