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
170
171
172
173
174
175
176
177
178
179
180
181
|
; RUN: opt -S -disable-output "-passes=print<scalar-evolution>" < %s 2>&1 | FileCheck %s
define void @s32_max1(i32 %n, i32* %p) {
entry:
%add = add i32 %n, 1
br label %do.body
do.body:
%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
%arrayidx = getelementptr i32, i32* %p, i32 %i.0
store i32 %i.0, i32* %arrayidx, align 4
%inc = add i32 %i.0, 1
%cmp = icmp slt i32 %i.0, %add
br i1 %cmp, label %do.body, label %do.end ; taken either 0 or 1 times
; CHECK-LABEL: Determining loop execution counts for: @s32_max1
; CHECK-NEXT: Loop %do.body: backedge-taken count is ((-1 * %n) + ((1 + %n) smax %n))
; CHECK-NEXT: Loop %do.body: max backedge-taken count is 1, actual taken count either this or zero.
do.end:
ret void
}
define void @s32_max2(i32 %n, i32* %p) {
entry:
%add = add i32 %n, 2
br label %do.body
do.body:
%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
%arrayidx = getelementptr i32, i32* %p, i32 %i.0
store i32 %i.0, i32* %arrayidx, align 4
%inc = add i32 %i.0, 1
%cmp = icmp slt i32 %i.0, %add
br i1 %cmp, label %do.body, label %do.end ; taken either 0 or 2 times
; CHECK-LABEL: Determining loop execution counts for: @s32_max2
; CHECK-NEXT: Loop %do.body: backedge-taken count is ((-1 * %n) + ((2 + %n) smax %n))
; CHECK-NEXT: Loop %do.body: max backedge-taken count is 2, actual taken count either this or zero.
do.end:
ret void
}
define void @s32_maxx(i32 %n, i32 %x, i32* %p) {
entry:
%add = add i32 %x, %n
br label %do.body
do.body:
%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
%arrayidx = getelementptr i32, i32* %p, i32 %i.0
store i32 %i.0, i32* %arrayidx, align 4
%inc = add i32 %i.0, 1
%cmp = icmp slt i32 %i.0, %add
br i1 %cmp, label %do.body, label %do.end ; taken either 0 or x times
; CHECK-LABEL: Determining loop execution counts for: @s32_maxx
; CHECK-NEXT: Loop %do.body: backedge-taken count is ((-1 * %n) + ((%n + %x) smax %n))
; CHECK-NEXT: Loop %do.body: max backedge-taken count is -1{{$}}
do.end:
ret void
}
define void @s32_max2_unpredictable_exit(i32 %n, i32 %x, i32* %p) {
entry:
%add = add i32 %n, 2
br label %do.body
do.body:
%i.0 = phi i32 [ %n, %entry ], [ %inc, %if.end ]
%cmp = icmp eq i32 %i.0, %x
br i1 %cmp, label %do.end, label %if.end ; unpredictable
if.end:
%arrayidx = getelementptr i32, i32* %p, i32 %i.0
store i32 %i.0, i32* %arrayidx, align 4
%inc = add i32 %i.0, 1
%cmp1 = icmp slt i32 %i.0, %add
br i1 %cmp1, label %do.body, label %do.end ; taken either 0 or 2 times
; CHECK-LABEL: Determining loop execution counts for: @s32_max2_unpredictable_exit
; CHECK-NEXT: Loop %do.body: <multiple exits> backedge-taken count is (((-1 * %n) + ((2 + %n) smax %n)) umin ((-1 * %n) + %x))
; CHECK-NEXT: exit count for do.body: ((-1 * %n) + %x)
; CHECK-NEXT: exit count for if.end: ((-1 * %n) + ((2 + %n) smax %n))
; CHECK-NEXT: Loop %do.body: max backedge-taken count is 2{{$}}
do.end:
ret void
}
define void @u32_max1(i32 %n, i32* %p) {
entry:
%add = add i32 %n, 1
br label %do.body
do.body:
%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
%arrayidx = getelementptr i32, i32* %p, i32 %i.0
store i32 %i.0, i32* %arrayidx, align 4
%inc = add i32 %i.0, 1
%cmp = icmp ult i32 %i.0, %add
br i1 %cmp, label %do.body, label %do.end ; taken either 0 or 1 times
; CHECK-LABEL: Determining loop execution counts for: @u32_max1
; CHECK-NEXT: Loop %do.body: backedge-taken count is ((-1 * %n) + ((1 + %n) umax %n))
; CHECK-NEXT: Loop %do.body: max backedge-taken count is 1, actual taken count either this or zero.
do.end:
ret void
}
define void @u32_max2(i32 %n, i32* %p) {
entry:
%add = add i32 %n, 2
br label %do.body
do.body:
%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
%arrayidx = getelementptr i32, i32* %p, i32 %i.0
store i32 %i.0, i32* %arrayidx, align 4
%inc = add i32 %i.0, 1
%cmp = icmp ult i32 %i.0, %add
br i1 %cmp, label %do.body, label %do.end ; taken either 0 or 2 times
; CHECK-LABEL: Determining loop execution counts for: @u32_max2
; CHECK-NEXT: Loop %do.body: backedge-taken count is ((-1 * %n) + ((2 + %n) umax %n))
; CHECK-NEXT: Loop %do.body: max backedge-taken count is 2, actual taken count either this or zero.
do.end:
ret void
}
define void @u32_maxx(i32 %n, i32 %x, i32* %p) {
entry:
%add = add i32 %x, %n
br label %do.body
do.body:
%i.0 = phi i32 [ %n, %entry ], [ %inc, %do.body ]
%arrayidx = getelementptr i32, i32* %p, i32 %i.0
store i32 %i.0, i32* %arrayidx, align 4
%inc = add i32 %i.0, 1
%cmp = icmp ult i32 %i.0, %add
br i1 %cmp, label %do.body, label %do.end ; taken either 0 or x times
; CHECK-LABEL: Determining loop execution counts for: @u32_maxx
; CHECK-NEXT: Loop %do.body: backedge-taken count is ((-1 * %n) + ((%n + %x) umax %n))
; CHECK-NEXT: Loop %do.body: max backedge-taken count is -1{{$}}
do.end:
ret void
}
define void @u32_max2_unpredictable_exit(i32 %n, i32 %x, i32* %p) {
entry:
%add = add i32 %n, 2
br label %do.body
do.body:
%i.0 = phi i32 [ %n, %entry ], [ %inc, %if.end ]
%cmp = icmp eq i32 %i.0, %x
br i1 %cmp, label %do.end, label %if.end ; unpredictable
if.end:
%arrayidx = getelementptr i32, i32* %p, i32 %i.0
store i32 %i.0, i32* %arrayidx, align 4
%inc = add i32 %i.0, 1
%cmp1 = icmp ult i32 %i.0, %add
br i1 %cmp1, label %do.body, label %do.end ; taken either 0 or 2 times
; CHECK-LABEL: Determining loop execution counts for: @u32_max2_unpredictable_exit
; CHECK-NEXT: Loop %do.body: <multiple exits> backedge-taken count is (((-1 * %n) + ((2 + %n) umax %n)) umin ((-1 * %n) + %x))
; CHECK-NEXT: exit count for do.body: ((-1 * %n) + %x)
; CHECK-NEXT: exit count for if.end: ((-1 * %n) + ((2 + %n) umax %n))
; CHECK-NEXT: Loop %do.body: max backedge-taken count is 2{{$}}
do.end:
ret void
}
|
