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
182
183
184
185
186
187
188
189
| ; RUN: opt < %s -jump-threading -print-lvi-after-jump-threading -disable-output 2>&1 | FileCheck %s
; Testing LVI cache after jump-threading
; Jump-threading transforms the IR below to one where
; loop and backedge basic blocks are merged into one.
; basic block (named backedge) with the branch being:
; %cont = icmp slt i32 %iv.next, 400
; br i1 %cont, label %backedge, label %exit
define i8 @test1(i32 %a, i32 %length) {
; CHECK-LABEL: LVI for function 'test1':
entry:
; CHECK-LABEL: entry:
; CHECK-NEXT: ; LatticeVal for: 'i32 %a' is: overdefined
; CHECK-NEXT: ; LatticeVal for: 'i32 %length' is: overdefined
br label %loop
; CHECK-LABEL: backedge:
; CHECK-NEXT: ; LatticeVal for: 'i32 %a' is: overdefined
; CHECK-NEXT: ; LatticeVal for: 'i32 %length' is: overdefined
; CHECK-NEXT: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%backedge' is: constantrange<0, 400>
; CHECK-NEXT: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%exit' is: constantrange<399, 400>
; CHECK-NEXT: %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
; CHECK-NEXT: ; LatticeVal for: ' %iv.next = add nsw i32 %iv, 1' in BB: '%backedge' is: constantrange<1, 401>
; CHECK-NEXT: ; LatticeVal for: ' %iv.next = add nsw i32 %iv, 1' in BB: '%exit' is: constantrange<400, 401>
; CHECK-NEXT: %iv.next = add nsw i32 %iv, 1
; CHECK-NEXT: ; LatticeVal for: ' %cont = icmp slt i32 %iv.next, 400' in BB: '%backedge' is: overdefined
; CHECK-NEXT: ; LatticeVal for: ' %cont = icmp slt i32 %iv.next, 400' in BB: '%exit' is: constantrange<0, -1>
; CHECK-NEXT: %cont = icmp slt i32 %iv.next, 400
; CHECK-NOT: loop
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
%cnd = icmp sge i32 %iv, 0
br i1 %cnd, label %backedge, label %exit
backedge:
%iv.next = add nsw i32 %iv, 1
%cont = icmp slt i32 %iv.next, 400
br i1 %cont, label %loop, label %exit
exit:
ret i8 0
}
; Here JT does not transform the code, but LVICache is populated during the processing of blocks.
define i8 @test2(i32 %n) {
; CHECK-LABEL: LVI for function 'test2':
; CHECK-LABEL: entry:
; CHECK-NEXT: ; LatticeVal for: 'i32 %n' is: overdefined
; CHECK-NEXT: br label %loop
entry:
br label %loop
; CHECK-LABEL: loop:
; CHECK-NEXT: ; LatticeVal for: 'i32 %n' is: overdefined
; CHECK-NEXT: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%loop' is: constantrange<0, 400>
; CHECK-DAG: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%backedge' is: constantrange<0, -2147483648>
; CHECK-DAG: ; LatticeVal for: ' %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]' in BB: '%exit' is: constantrange<0, -2147483648>
; CHECK-NEXT: %iv = phi i32 [ 0, %entry ], [ %iv.next, %backedge ]
loop:
%iv = phi i32 [0, %entry], [%iv.next, %backedge]
; CHECK-NEXT: ; LatticeVal for: ' %iv2 = phi i32 [ %n, %entry ], [ %iv2.next, %backedge ]' in BB: '%loop' is: overdefined
; CHECK-DAG: ; LatticeVal for: ' %iv2 = phi i32 [ %n, %entry ], [ %iv2.next, %backedge ]' in BB: '%backedge' is: constantrange<1, -2147483648>
; CHECK-DAG: ; LatticeVal for: ' %iv2 = phi i32 [ %n, %entry ], [ %iv2.next, %backedge ]' in BB: '%exit' is: overdefined
; CHECK-NEXT: %iv2 = phi i32 [ %n, %entry ], [ %iv2.next, %backedge ]
%iv2 = phi i32 [%n, %entry], [%iv2.next, %backedge]
; CHECK-NEXT: ; LatticeVal for: ' %cnd1 = icmp sge i32 %iv, 0' in BB: '%loop' is: overdefined
; CHECK-DAG: ; LatticeVal for: ' %cnd1 = icmp sge i32 %iv, 0' in BB: '%backedge' is: overdefined
; CHECK-DAG: ; LatticeVal for: ' %cnd1 = icmp sge i32 %iv, 0' in BB: '%exit' is: overdefined
; CHECK-NEXT: %cnd1 = icmp sge i32 %iv, 0
%cnd1 = icmp sge i32 %iv, 0
%cnd2 = icmp sgt i32 %iv2, 0
; CHECK: %cnd2 = icmp sgt i32 %iv2, 0
; CHECK: ; LatticeVal for: ' %cnd = and i1 %cnd1, %cnd2' in BB: '%loop' is: constantrange<-1, -1>
; CHECK-DAG: ; LatticeVal for: ' %cnd = and i1 %cnd1, %cnd2' in BB: '%backedge' is: constantrange<-1, 0>
; CHECK-DAG: ; LatticeVal for: ' %cnd = and i1 %cnd1, %cnd2' in BB: '%exit' is: overdefined
; CHECK-NEXT: %cnd = and i1 %cnd1, %cnd2
%cnd = and i1 %cnd1, %cnd2
br i1 %cnd, label %backedge, label %exit
; CHECK-LABEL: backedge:
; CHECK-NEXT: ; LatticeVal for: 'i32 %n' is: overdefined
; CHECK-NEXT: ; LatticeVal for: ' %iv.next = add nsw i32 %iv, 1' in BB: '%backedge' is: constantrange<1, -2147483648>
; CHECK-NEXT: %iv.next = add nsw i32 %iv, 1
backedge:
%iv.next = add nsw i32 %iv, 1
%iv2.next = sub nsw i32 %iv2, 1
; CHECK: ; LatticeVal for: ' %cont1 = icmp slt i32 %iv.next, 400' in BB: '%backedge' is: overdefined
; CHECK-NEXT: %cont1 = icmp slt i32 %iv.next, 400
%cont1 = icmp slt i32 %iv.next, 400
; CHECK-NEXT: ; LatticeVal for: ' %cont2 = icmp sgt i32 %iv2.next, 0' in BB: '%backedge' is: overdefined
; CHECK-NEXT: %cont2 = icmp sgt i32 %iv2.next, 0
%cont2 = icmp sgt i32 %iv2.next, 0
; CHECK-NEXT: ; LatticeVal for: ' %cont = and i1 %cont1, %cont2' in BB: '%backedge' is: constantrange<-1, -1>
; CHECK-NEXT: %cont = and i1 %cont1, %cont2
%cont = and i1 %cont1, %cont2
br i1 %cont, label %loop, label %exit
exit:
ret i8 0
}
; Merging cont block into do block. Make sure that we do not incorrectly have the cont
; LVI info as LVI info for the beginning of do block. LVI info for %i is Range[0,1)
; at beginning of cont Block, which is incorrect at the beginning of do block.
define i32 @test3(i32 %i, i1 %f, i32 %n) {
; CHECK-LABEL: LVI for function 'test3':
; CHECK-LABEL: entry
; CHECK: ; LatticeVal for: 'i32 %i' is: overdefined
; CHECK: %c = icmp ne i32 %i, -2134
; CHECK: br i1 %c, label %cont, label %exit
entry:
%c = icmp ne i32 %i, -2134
br i1 %c, label %do, label %exit
exit:
%c1 = icmp ne i32 %i, -42
br i1 %c1, label %exit2, label %exit
; CHECK-LABEL: cont:
; Here cont is merged to do and i is any value except -2134.
; i is not the single value: zero.
; CHECK-NOT: ; LatticeVal for: 'i32 %i' is: constantrange<0, 1>
; CHECK: ; LatticeVal for: 'i32 %i' is: constantrange<-2133, -2134>
; CHECK: ; LatticeVal for: ' %cond.0 = icmp sgt i32 %i, 0' in BB: '%cont' is: overdefined
; CHECK: %cond.0 = icmp sgt i32 %i, 0
; CHECK: %consume = call i32 @consume
; CHECK: %cond = icmp eq i32 %i, 0
; CHECK: call void (i1, ...) @llvm.experimental.guard(i1 %cond)
; CHECK: %cond.3 = icmp sgt i32 %i, %n
; CHECK: br i1 %cond.3, label %exit2, label %exit
cont:
%cond.3 = icmp sgt i32 %i, %n
br i1 %cond.3, label %exit2, label %exit
do:
%cond.0 = icmp sgt i32 %i, 0
%consume = call i32 @consume(i1 %cond.0)
%cond = icmp eq i32 %i, 0
call void (i1, ...) @llvm.experimental.guard(i1 %cond) [ "deopt"() ]
%cond.2 = icmp sgt i32 %i, 0
br i1 %cond.2, label %exit, label %cont
exit2:
; CHECK-LABEL: exit2:
; LatticeVal for: 'i32 %i' is: constantrange<-2134, 1>
ret i32 30
}
; FIXME: We should be able to merge cont into do.
; When we do so, LVI for cont cannot be the one for the merged do block.
define i32 @test4(i32 %i, i1 %f, i32 %n) {
; CHECK-LABEL: LVI for function 'test4':
entry:
%c = icmp ne i32 %i, -2134
br i1 %c, label %do, label %exit
exit: ; preds = %do, %cont, %exit, %entry
%c1 = icmp ne i32 %i, -42
br i1 %c1, label %exit2, label %exit
cont: ; preds = %do
; CHECK-LABEL: cont:
; CHECK: ; LatticeVal for: 'i1 %f' is: constantrange<-1, 0>
; CHECK: call void @dummy(i1 %f)
call void @dummy(i1 %f)
br label %exit2
do: ; preds = %entry
; CHECK-LABEL: do:
; CHECK: ; LatticeVal for: 'i1 %f' is: overdefined
; CHECK: call void @dummy(i1 %f)
; CHECK: br i1 %cond, label %exit, label %cont
call void @dummy(i1 %f)
%consume = call i32 @exit()
call void @llvm.assume(i1 %f)
%cond = icmp eq i1 %f, false
br i1 %cond, label %exit, label %cont
exit2: ; preds = %cont, %exit
ret i32 30
}
declare i32 @exit()
declare i32 @consume(i1)
declare void @llvm.assume(i1) nounwind
declare void @dummy(i1) nounwind
declare void @llvm.experimental.guard(i1, ...)
|