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
|
; RUN: opt < %s -loop-unroll -unroll-runtime=true -unroll-runtime-epilog=false -unroll-runtime-multi-exit=true -unroll-count=4 -verify-dom-info -S | FileCheck %s
; REQUIRES: asserts
; The tests below are for verifying dom tree after runtime unrolling
; with multiple exit/exiting blocks.
; We explicitly set the unroll count so that expensiveTripCount computation is allowed.
; mergedexit block has edges from loop exit blocks.
define i64 @test1() {
; CHECK-LABEL: test1(
; CHECK-LABEL: headerexit:
; CHECK-NEXT: %addphi = phi i64 [ %add.iv, %header ], [ %add.iv.1, %header.1 ], [ %add.iv.2, %header.2 ], [ %add.iv.3, %header.3 ]
; CHECK-NEXT: br label %mergedexit
; CHECK-LABEL: latchexit:
; CHECK-NEXT: %shftphi = phi i64 [ %shft, %latch ], [ %shft.1, %latch.1 ], [ %shft.2, %latch.2 ], [ %shft.3, %latch.3 ]
; CHECK-NEXT: br label %mergedexit
; CHECK-LABEL: mergedexit:
; CHECK-NEXT: %retval = phi i64 [ %addphi, %headerexit ], [ %shftphi, %latchexit ]
; CHECK-NEXT: ret i64 %retval
entry:
br label %preheader
preheader: ; preds = %bb
%trip = zext i32 undef to i64
br label %header
header: ; preds = %latch, %preheader
%iv = phi i64 [ 2, %preheader ], [ %add.iv, %latch ]
%add.iv = add nuw nsw i64 %iv, 2
%cmp1 = icmp ult i64 %add.iv, %trip
br i1 %cmp1, label %latch, label %headerexit
latch: ; preds = %header
%shft = ashr i64 %add.iv, 1
%cmp2 = icmp ult i64 %shft, %trip
br i1 %cmp2, label %header, label %latchexit
headerexit: ; preds = %header
%addphi = phi i64 [ %add.iv, %header ]
br label %mergedexit
latchexit: ; preds = %latch
%shftphi = phi i64 [ %shft, %latch ]
br label %mergedexit
mergedexit: ; preds = %latchexit, %headerexit
%retval = phi i64 [ %addphi, %headerexit ], [ %shftphi, %latchexit ]
ret i64 %retval
}
; mergedexit has edges from loop exit blocks and a block outside the loop.
define void @test2(i1 %cond, i32 %n) {
; CHECK-LABEL: header.1:
; CHECK-NEXT: %add.iv.1 = add nuw nsw i64 %add.iv, 2
; CHECK: br i1 %cmp1.1, label %latch.1, label %headerexit
; CHECK-LABEL: latch.3:
; CHECK: %cmp2.3 = icmp ult i64 %shft.3, %trip
; CHECK-NEXT: br i1 %cmp2.3, label %header, label %latchexit, !llvm.loop
entry:
br i1 %cond, label %preheader, label %mergedexit
preheader: ; preds = %entry
%trip = zext i32 %n to i64
br label %header
header: ; preds = %latch, %preheader
%iv = phi i64 [ 2, %preheader ], [ %add.iv, %latch ]
%add.iv = add nuw nsw i64 %iv, 2
%cmp1 = icmp ult i64 %add.iv, %trip
br i1 %cmp1, label %latch, label %headerexit
latch: ; preds = %header
%shft = ashr i64 %add.iv, 1
%cmp2 = icmp ult i64 %shft, %trip
br i1 %cmp2, label %header, label %latchexit
headerexit: ; preds = %header
br label %mergedexit
latchexit: ; preds = %latch
br label %mergedexit
mergedexit: ; preds = %latchexit, %headerexit, %entry
ret void
}
; exitsucc is from loop exit block only.
define i64 @test3(i32 %n) {
; CHECK-LABEL: test3(
; CHECK-LABEL: headerexit:
; CHECK-NEXT: br label %exitsucc
; CHECK-LABEL: latchexit:
; CHECK-NEXT: %shftphi = phi i64 [ %shft, %latch ], [ %shft.1, %latch.1 ], [ %shft.2, %latch.2 ], [ %shft.3, %latch.3 ]
; CHECK-NEXT: ret i64 %shftphi
; CHECK-LABEL: exitsucc:
; CHECK-NEXT: ret i64 96
entry:
br label %preheader
preheader: ; preds = %bb
%trip = zext i32 %n to i64
br label %header
header: ; preds = %latch, %preheader
%iv = phi i64 [ 2, %preheader ], [ %add.iv, %latch ]
%add.iv = add nuw nsw i64 %iv, 2
%cmp1 = icmp ult i64 %add.iv, %trip
br i1 %cmp1, label %latch, label %headerexit
latch: ; preds = %header
%shft = ashr i64 %add.iv, 1
%cmp2 = icmp ult i64 %shft, %trip
br i1 %cmp2, label %header, label %latchexit
headerexit: ; preds = %header
br label %exitsucc
latchexit: ; preds = %latch
%shftphi = phi i64 [ %shft, %latch ]
ret i64 %shftphi
exitsucc: ; preds = %headerexit
ret i64 96
}
|
