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
190
191
192
193
194
195
196
197
198
199
200
201
|
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt -passes=guard-widening -S < %s | FileCheck %s
declare i32 @llvm.experimental.deoptimize.i32(...)
; Make sure the two loop-invariant conditions can be widened together,
; and the widening point is outside the loop.
define i32 @test_01(i32 %start, i32 %x) {
; CHECK-LABEL: @test_01(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[START_GW_FR:%.*]] = freeze i32 [[START:%.*]]
; CHECK-NEXT: [[X_GW_FR:%.*]] = freeze i32 [[X:%.*]]
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[START_GW_FR]], [[X_GW_FR]]
; CHECK-NEXT: [[WIDE_CHK:%.*]] = and i1 true, [[COND]]
; CHECK-NEXT: [[WC1:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START_GW_FR]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[TMP0:%.*]] = and i1 [[WIDE_CHK]], [[WC1]]
; CHECK-NEXT: br i1 [[TMP0]], label [[GUARD_BLOCK:%.*]], label [[EXIT_BY_WC:%.*]]
; CHECK: exit_by_wc:
; CHECK-NEXT: [[RVAL1:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV]]) ]
; CHECK-NEXT: ret i32 [[RVAL1]]
; CHECK: guard_block:
; CHECK-NEXT: [[WC2:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[GUARD:%.*]] = and i1 [[COND]], [[WC2]]
; CHECK-NEXT: br i1 true, label [[BACKEDGE]], label [[FAILURE:%.*]]
; CHECK: backedge:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT: br label [[LOOP]]
; CHECK: exit:
; CHECK-NEXT: ret i32 -1
; CHECK: failure:
; CHECK-NEXT: [[RVAL2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV]]) ]
; CHECK-NEXT: ret i32 [[RVAL2]]
;
entry:
%cond = icmp eq i32 %start, %x
%wc1 = call i1 @llvm.experimental.widenable.condition()
br label %loop
loop:
%iv = phi i32 [ %start, %entry ], [ %iv.next, %backedge ]
br i1 %wc1, label %guard_block, label %exit_by_wc
exit_by_wc:
%rval1 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]
ret i32 %rval1
guard_block:
%wc2 = call i1 @llvm.experimental.widenable.condition()
%guard = and i1 %cond, %wc2
br i1 %guard, label %backedge, label %failure
backedge:
call void @side_effect()
%iv.next = add i32 %iv, 1
br label %loop
exit:
ret i32 -1
failure:
%rval2 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]
ret i32 %rval2
}
; Make sure the loop-variant condition is not widened into loop-invariant.
define i32 @test_02(i32 %start, i32 %x) {
; CHECK-LABEL: @test_02(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[WC1:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START:%.*]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: br i1 [[WC1]], label [[GUARD_BLOCK:%.*]], label [[EXIT_BY_WC:%.*]]
; CHECK: exit_by_wc:
; CHECK-NEXT: [[RVAL1:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV]]) ]
; CHECK-NEXT: ret i32 [[RVAL1]]
; CHECK: guard_block:
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[IV]], [[X:%.*]]
; CHECK-NEXT: [[WC2:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[GUARD:%.*]] = and i1 [[COND]], [[WC2]]
; CHECK-NEXT: br i1 [[GUARD]], label [[BACKEDGE]], label [[FAILURE:%.*]]
; CHECK: backedge:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT: br label [[LOOP]]
; CHECK: exit:
; CHECK-NEXT: ret i32 -1
; CHECK: failure:
; CHECK-NEXT: [[RVAL2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV]]) ]
; CHECK-NEXT: ret i32 [[RVAL2]]
;
entry:
%wc1 = call i1 @llvm.experimental.widenable.condition()
br label %loop
loop:
%iv = phi i32 [ %start, %entry ], [ %iv.next, %backedge ]
br i1 %wc1, label %guard_block, label %exit_by_wc
exit_by_wc:
%rval1 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]
ret i32 %rval1
guard_block:
%cond = icmp eq i32 %iv, %x
%wc2 = call i1 @llvm.experimental.widenable.condition()
%guard = and i1 %cond, %wc2
br i1 %guard, label %backedge, label %failure
backedge:
call void @side_effect()
%iv.next = add i32 %iv, 1
br label %loop
exit:
ret i32 -1
failure:
%rval2 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]
ret i32 %rval2
}
; Same as test_01, but the initial condition is not immediately WC.
define i32 @test_03(i32 %start, i32 %x, i1 %c) {
; CHECK-LABEL: @test_03(
; CHECK-NEXT: entry:
; CHECK-NEXT: [[START_GW_FR:%.*]] = freeze i32 [[START:%.*]]
; CHECK-NEXT: [[X_GW_FR:%.*]] = freeze i32 [[X:%.*]]
; CHECK-NEXT: [[COND:%.*]] = icmp eq i32 [[START_GW_FR]], [[X_GW_FR]]
; CHECK-NEXT: [[WIDE_CHK:%.*]] = and i1 [[C:%.*]], [[COND]]
; CHECK-NEXT: [[WC1:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: br label [[LOOP:%.*]]
; CHECK: loop:
; CHECK-NEXT: [[IV:%.*]] = phi i32 [ [[START_GW_FR]], [[ENTRY:%.*]] ], [ [[IV_NEXT:%.*]], [[BACKEDGE:%.*]] ]
; CHECK-NEXT: [[INVARIANT:%.*]] = and i1 [[WIDE_CHK]], [[WC1]]
; CHECK-NEXT: br i1 [[INVARIANT]], label [[GUARD_BLOCK:%.*]], label [[EXIT_BY_WC:%.*]]
; CHECK: exit_by_wc:
; CHECK-NEXT: [[RVAL1:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV]]) ]
; CHECK-NEXT: ret i32 [[RVAL1]]
; CHECK: guard_block:
; CHECK-NEXT: [[WC2:%.*]] = call i1 @llvm.experimental.widenable.condition()
; CHECK-NEXT: [[GUARD:%.*]] = and i1 [[COND]], [[WC2]]
; CHECK-NEXT: br i1 true, label [[BACKEDGE]], label [[FAILURE:%.*]]
; CHECK: backedge:
; CHECK-NEXT: call void @side_effect()
; CHECK-NEXT: [[IV_NEXT]] = add i32 [[IV]], 1
; CHECK-NEXT: br label [[LOOP]]
; CHECK: exit:
; CHECK-NEXT: ret i32 -1
; CHECK: failure:
; CHECK-NEXT: [[RVAL2:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[IV]]) ]
; CHECK-NEXT: ret i32 [[RVAL2]]
; CHECK: early_failure:
; CHECK-NEXT: [[RVAL3:%.*]] = call i32 (...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 [[X_GW_FR]]) ]
; CHECK-NEXT: ret i32 [[RVAL3]]
;
entry:
%cond = icmp eq i32 %start, %x
%wc1 = call i1 @llvm.experimental.widenable.condition()
%invariant = and i1 %c, %wc1
br label %loop
loop:
%iv = phi i32 [ %start, %entry ], [ %iv.next, %backedge ]
br i1 %invariant, label %guard_block, label %exit_by_wc
exit_by_wc:
%rval1 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]
ret i32 %rval1
guard_block:
%wc2 = call i1 @llvm.experimental.widenable.condition()
%guard = and i1 %cond, %wc2
br i1 %guard, label %backedge, label %failure
backedge:
call void @side_effect()
%iv.next = add i32 %iv, 1
br label %loop
exit:
ret i32 -1
failure:
%rval2 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %iv) ]
ret i32 %rval2
early_failure:
%rval3 = call i32(...) @llvm.experimental.deoptimize.i32() [ "deopt"(i32 %x) ]
ret i32 %rval3
}
; Function Attrs: nocallback nofree nosync nounwind speculatable willreturn memory(inaccessiblemem: readwrite)
declare i1 @llvm.experimental.widenable.condition()
declare void @side_effect()
|
