falkor-prefetch.ll
3.81 KB
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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
; RUN: opt < %s -S -loop-unroll -mtriple aarch64 -mcpu=falkor | FileCheck %s
; RUN: opt < %s -S -loop-unroll -mtriple aarch64 -mcpu=falkor -enable-falkor-hwpf-unroll-fix=0 | FileCheck %s --check-prefix=NOHWPF
; Check that loop unroller doesn't exhaust HW prefetcher resources.
; Partial unroll 2 times for this loop on falkor instead of 4.
; NOHWPF-LABEL: @unroll1(
; NOHWPF-LABEL: loop:
; NOHWPF-NEXT: phi
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: icmp
; NOHWPF-NEXT: br
; NOHWPF-NEXT-LABEL: exit:
;
; CHECK-LABEL: @unroll1(
; CHECK-LABEL: loop:
; CHECK-NEXT: phi
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: add
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: add
; CHECK-NEXT: icmp
; CHECK-NEXT: br
; CHECK-NEXT-LABEL: exit:
define void @unroll1(i32* %p, i32* %p2) {
entry:
br label %loop
loop:
%iv = phi i32 [ 0, %entry ], [ %inc, %loop ]
%gep = getelementptr inbounds i32, i32* %p, i32 %iv
%load = load volatile i32, i32* %gep
%gep2 = getelementptr inbounds i32, i32* %p2, i32 %iv
%load2 = load volatile i32, i32* %gep2
%inc = add i32 %iv, 1
%exitcnd = icmp uge i32 %inc, 1024
br i1 %exitcnd, label %exit, label %loop
exit:
ret void
}
; Partial unroll 4 times for this loop on falkor instead of 8.
; NOHWPF-LABEL: @unroll2(
; NOHWPF-LABEL: loop2:
; NOHWPF-NEXT: phi
; NOHWPF-NEXT: phi
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: add
; NOHWPF-NEXT: getelementptr
; NOHWPF-NEXT: load
; NOHWPF-NEXT: add
; NOHWPF-NEXT: add
; NOHWPF-NEXT: icmp
; NOHWPF-NEXT: br
; NOHWPF-NEXT-LABEL: exit2:
;
; CHECK-LABEL: @unroll2(
; CHECK-LABEL: loop2:
; CHECK-NEXT: phi
; CHECK-NEXT: phi
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: getelementptr
; CHECK-NEXT: load
; CHECK-NEXT: add
; CHECK-NEXT: add
; CHECK-NEXT: icmp
; CHECK-NEXT: br
; CHECK-NEXT-LABEL: exit2:
define void @unroll2(i32* %p) {
entry:
br label %loop1
loop1:
%iv1 = phi i32 [ 0, %entry ], [ %inc1, %loop1.latch ]
%outer.sum = phi i32 [ 0, %entry ], [ %sum, %loop1.latch ]
br label %loop2.header
loop2.header:
br label %loop2
loop2:
%iv2 = phi i32 [ 0, %loop2.header ], [ %inc2, %loop2 ]
%sum = phi i32 [ %outer.sum, %loop2.header ], [ %sum.inc, %loop2 ]
%gep = getelementptr inbounds i32, i32* %p, i32 %iv2
%load = load i32, i32* %gep
%sum.inc = add i32 %sum, %load
%inc2 = add i32 %iv2, 1
%exitcnd2 = icmp uge i32 %inc2, 1024
br i1 %exitcnd2, label %exit2, label %loop2
exit2:
br label %loop1.latch
loop1.latch:
%inc1 = add i32 %iv1, 1
%exitcnd1 = icmp uge i32 %inc1, 1024
br i1 %exitcnd2, label %exit, label %loop1
exit:
ret void
}