temporal_diverge.ll
4.22 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
; RUN: opt -mtriple amdgcn-unknown-amdhsa -analyze -divergence -use-gpu-divergence-analysis %s | FileCheck %s
; temporal-divergent use of value carried by divergent loop
define amdgpu_kernel void @temporal_diverge(i32 %n, i32 %a, i32 %b) #0 {
; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'temporal_diverge':
; CHECK-NOT: DIVERGENT: %uni.
; CHECK-NOT: DIVERGENT: br i1 %uni.
entry:
%tid = call i32 @llvm.amdgcn.workitem.id.x()
%uni.cond = icmp slt i32 %a, 0
br label %H
H:
%uni.merge.h = phi i32 [ 0, %entry ], [ %uni.inc, %H ]
%uni.inc = add i32 %uni.merge.h, 1
%div.exitx = icmp slt i32 %tid, 0
br i1 %div.exitx, label %X, label %H ; divergent branch
; CHECK: DIVERGENT: %div.exitx =
; CHECK: DIVERGENT: br i1 %div.exitx,
X:
%div.user = add i32 %uni.inc, 5
ret void
}
; temporal-divergent use of value carried by divergent loop inside a top-level loop
define amdgpu_kernel void @temporal_diverge_inloop(i32 %n, i32 %a, i32 %b) #0 {
; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'temporal_diverge_inloop':
; CHECK-NOT: DIVERGENT: %uni.
; CHECK-NOT: DIVERGENT: br i1 %uni.
entry:
%tid = call i32 @llvm.amdgcn.workitem.id.x()
%uni.cond = icmp slt i32 %a, 0
br label %G
G:
br label %H
H:
%uni.merge.h = phi i32 [ 0, %G ], [ %uni.inc, %H ]
%uni.inc = add i32 %uni.merge.h, 1
%div.exitx = icmp slt i32 %tid, 0
br i1 %div.exitx, label %X, label %H ; divergent branch
; CHECK: DIVERGENT: %div.exitx =
; CHECK: DIVERGENT: br i1 %div.exitx,
X:
%div.user = add i32 %uni.inc, 5
br i1 %uni.cond, label %G, label %Y
Y:
%div.alsouser = add i32 %uni.inc, 5
ret void
}
; temporal-uniform use of a valud, definition and users are carried by a surrounding divergent loop
define amdgpu_kernel void @temporal_uniform_indivloop(i32 %n, i32 %a, i32 %b) #0 {
; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'temporal_uniform_indivloop':
; CHECK-NOT: DIVERGENT: %uni.
; CHECK-NOT: DIVERGENT: br i1 %uni.
entry:
%tid = call i32 @llvm.amdgcn.workitem.id.x()
%uni.cond = icmp slt i32 %a, 0
br label %G
G:
br label %H
H:
%uni.merge.h = phi i32 [ 0, %G ], [ %uni.inc, %H ]
%uni.inc = add i32 %uni.merge.h, 1
br i1 %uni.cond, label %X, label %H ; divergent branch
X:
%uni.user = add i32 %uni.inc, 5
%div.exity = icmp slt i32 %tid, 0
; CHECK: DIVERGENT: %div.exity =
br i1 %div.exity, label %G, label %Y
; CHECK: DIVERGENT: br i1 %div.exity,
Y:
%div.alsouser = add i32 %uni.inc, 5
ret void
}
; temporal-divergent use of value carried by divergent loop, user is inside sibling loop
define amdgpu_kernel void @temporal_diverge_loopuser(i32 %n, i32 %a, i32 %b) #0 {
; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'temporal_diverge_loopuser':
; CHECK-NOT: DIVERGENT: %uni.
; CHECK-NOT: DIVERGENT: br i1 %uni.
entry:
%tid = call i32 @llvm.amdgcn.workitem.id.x()
%uni.cond = icmp slt i32 %a, 0
br label %H
H:
%uni.merge.h = phi i32 [ 0, %entry ], [ %uni.inc, %H ]
%uni.inc = add i32 %uni.merge.h, 1
%div.exitx = icmp slt i32 %tid, 0
br i1 %div.exitx, label %X, label %H ; divergent branch
; CHECK: DIVERGENT: %div.exitx =
; CHECK: DIVERGENT: br i1 %div.exitx,
X:
br label %G
G:
%div.user = add i32 %uni.inc, 5
br i1 %uni.cond, label %G, label %Y
Y:
ret void
}
; temporal-divergent use of value carried by divergent loop, user is inside sibling loop, defs and use are carried by a uniform loop
define amdgpu_kernel void @temporal_diverge_loopuser_nested(i32 %n, i32 %a, i32 %b) #0 {
; CHECK-LABEL: Printing analysis 'Legacy Divergence Analysis' for function 'temporal_diverge_loopuser_nested':
; CHECK-NOT: DIVERGENT: %uni.
; CHECK-NOT: DIVERGENT: br i1 %uni.
entry:
%tid = call i32 @llvm.amdgcn.workitem.id.x()
%uni.cond = icmp slt i32 %a, 0
br label %H
H:
%uni.merge.h = phi i32 [ 0, %entry ], [ %uni.inc, %H ]
%uni.inc = add i32 %uni.merge.h, 1
%div.exitx = icmp slt i32 %tid, 0
br i1 %div.exitx, label %X, label %H ; divergent branch
; CHECK: DIVERGENT: %div.exitx =
; CHECK: DIVERGENT: br i1 %div.exitx,
X:
br label %G
G:
%div.user = add i32 %uni.inc, 5
br i1 %uni.cond, label %G, label %Y
Y:
ret void
}
declare i32 @llvm.amdgcn.workitem.id.x() #0
attributes #0 = { nounwind readnone }