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
|
; RUN: opt -S -passes='require<scalar-evolution>,require<lazy-value-info>,loop-mssa(loop-predication)' -debug-pass-manager < %s 2>&1 | FileCheck %s
; NOTE: LazyValueAnalysis is an arbitrary analysis that just isn't preserved by
; this pass. If after your change this analysis is preserved by the pass,
; please update this test some other analysis that isn't preserved.
; CHECK: Running analysis: LazyValueAnalysis on drop_a_wc_and_leave_early
; CHECK: Running pass: LoopPredicationPass on loop %loop in function drop_a_wc_and_leave_early
; CHECK: Invalidating analysis: LazyValueAnalysis on drop_a_wc_and_leave_early
; CHECK: Running analysis: LazyValueAnalysis on drop_a_wc_and_leave
; CHECK: Running pass: LoopPredicationPass on loop %loop in function drop_a_wc_and_leave
; CHECK: Invalidating analysis: LazyValueAnalysis on drop_a_wc_and_leave
; This test makes the pass drop its attempts to optimize the exit condition in
; `%loop` BB by using unanalyzable `%cond_0` as an exit condition.
define i64 @drop_a_wc_and_leave_early(i64 %length, i64 %n, i1 %cond_0, i1 %cond_1) {
; Make sure the pass has only replaced `%wc2` with `true` in the definition of `%wb_cond`.
; CHECK-LABEL: define i64 @drop_a_wc_and_leave_early(i64 %length, i64 %n, i1 %cond_0, i1 %cond_1) {
; CHECK-NEXT: entry:
; CHECK-NEXT: %wc1 = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: %wc2 = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: %exiplicit_guard_cond = and i1 %cond_0, %wc1
; CHECK-NEXT: br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0
; CHECK: deopt:
; CHECK-NEXT: %deoptret = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
; CHECK-NEXT: ret i64 %deoptret
; CHECK: loop.preheader:
; CHECK-NEXT: br label %loop
; CHECK: loop:
; CHECK-NEXT: %i = phi i64 [ %i.next, %guarded2 ], [ 0, %loop.preheader ]
; CHECK-NEXT: br i1 %cond_0, label %guarded, label %deopt2, !prof !0
; CHECK: deopt2:
; CHECK-NEXT: %deoptret2 = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
; CHECK-NEXT: ret i64 %deoptret2
; CHECK: guarded:
; CHECK-NEXT: %wb_cond = and i1 %cond_1, true
; CHECK-NEXT: br i1 %wb_cond, label %guarded2, label %deopt3, !prof !0
; CHECK: deopt3:
; CHECK-NEXT: %deoptret3 = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
; CHECK-NEXT: ret i64 %deoptret3
; CHECK: guarded2:
; CHECK-NEXT: %i.next = add nuw i64 %i, 1
; CHECK-NEXT: %continue = icmp ult i64 %i.next, %n
; CHECK-NEXT: br i1 %continue, label %loop, label %exit
; CHECK: exit:
; CHECK-NEXT: ret i64 0
; CHECK-NEXT: }
entry:
%wc1 = call i1 @llvm.experimental.widenable.condition()
%wc2 = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %wc1
br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0
deopt:
%deoptret = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
ret i64 %deoptret
loop.preheader:
br label %loop
loop:
%i = phi i64 [ %i.next, %guarded2 ], [ 0, %loop.preheader ]
br i1 %cond_0, label %guarded, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
ret i64 %deoptret2
guarded:
%wb_cond = and i1 %cond_1, %wc2
br i1 %wb_cond, label %guarded2, label %deopt3, !prof !0
deopt3:
%deoptret3 = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
ret i64 %deoptret3
guarded2:
%i.next = add nuw i64 %i, 1
%continue = icmp ult i64 %i.next, %n
br i1 %continue, label %loop, label %exit
exit:
ret i64 0
}
; This test makes the pass drop its attempts to optimize the exit condition in
; `%loop` BB by using trivial `false` as an exit condition.
define i64 @drop_a_wc_and_leave(i64 %n, i1 %cond_0, i1 %cond_1) {
; Make sure the pass has only replaced `%wc2` with `true` in the definition of `%wb_cond`.
; CHECK-LABEL: define i64 @drop_a_wc_and_leave(i64 %n, i1 %cond_0, i1 %cond_1) {
; CHECK-NEXT: entry:
; CHECK-NEXT: %wc1 = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: %wc2 = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: %exiplicit_guard_cond = and i1 %cond_0, %wc1
; CHECK-NEXT: br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0
; CHECK: deopt:
; CHECK-NEXT: %deoptret = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
; CHECK-NEXT: ret i64 %deoptret
; CHECK: loop.preheader:
; CHECK-NEXT: br label %loop
; CHECK: loop:
; CHECK-NEXT: %i = phi i64 [ %i.next, %guarded2 ], [ 0, %loop.preheader ]
; CHECK-NEXT: br i1 false, label %guarded, label %deopt2, !prof !0
; CHECK: deopt2:
; CHECK-NEXT: %deoptret2 = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
; CHECK-NEXT: ret i64 %deoptret2
; CHECK: guarded:
; CHECK-NEXT: %wb_cond = and i1 %cond_1, true
; CHECK-NEXT: br i1 %wb_cond, label %guarded2, label %deopt3, !prof !0
; CHECK: deopt3:
; CHECK-NEXT: %deoptret3 = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
; CHECK-NEXT: ret i64 %deoptret3
; CHECK: guarded2:
; CHECK-NEXT: %i.next = add nuw i64 %i, 1
; CHECK-NEXT: %continue = icmp ult i64 %i.next, %n
; CHECK-NEXT: br i1 %continue, label %loop, label %exit
; CHECK: exit:
; CHECK-NEXT: ret i64 0
; CHECK-NEXT: }
entry:
%wc1 = call i1 @llvm.experimental.widenable.condition()
%wc2 = call i1 @llvm.experimental.widenable.condition()
%exiplicit_guard_cond = and i1 %cond_0, %wc1
br i1 %exiplicit_guard_cond, label %loop.preheader, label %deopt, !prof !0
deopt:
%deoptret = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
ret i64 %deoptret
loop.preheader:
br label %loop
loop:
%i = phi i64 [ %i.next, %guarded2 ], [ 0, %loop.preheader ]
br i1 false, label %guarded, label %deopt2, !prof !0
deopt2:
%deoptret2 = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
ret i64 %deoptret2
guarded:
%wb_cond = and i1 %cond_1, %wc2
br i1 %wb_cond, label %guarded2, label %deopt3, !prof !0
deopt3:
%deoptret3 = call i64 (...) @llvm.experimental.deoptimize.i64() [ "deopt"() ]
ret i64 %deoptret3
guarded2:
%i.next = add nuw i64 %i, 1
%continue = icmp ult i64 %i.next, %n
br i1 %continue, label %loop, label %exit
exit:
ret i64 0
}
declare i1 @llvm.experimental.widenable.condition()
declare i64 @llvm.experimental.deoptimize.i64(...)
!0 = !{!"branch_weights", i64 1048576, i64 1}
|
