/
delete-dead-blocks.ll
102 lines (97 loc) · 2.23 KB
/
delete-dead-blocks.ll
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
; RUN: opt < %s -simple-loop-unswitch -enable-nontrivial-unswitch -S 2>&1 | FileCheck %s
; RUN: opt < %s -passes='simple-loop-unswitch<nontrivial>' -S 2>&1 | FileCheck %s
; RUN: opt < %s -passes='loop-mssa(simple-loop-unswitch<nontrivial>)' -S 2>&1 | FileCheck %s
;
; Checking that (dead) blocks from inner loop are deleted after unswitch.
;
declare void @foo()
; CHECK-LABEL: @Test
define void @Test(i32) {
entry:
br label %outer
outer:
%oi = phi i32 [ 0, %entry ], [ %oinc, %outer_continue]
br label %inner
inner:
%ii = phi i32 [ 0, %outer ], [ %iinc, %continue]
call void @foo()
switch i32 %0, label %get_out2 [
i32 0, label %continue
i32 1, label %case1
i32 2, label %get_out
]
;
; since we unswitch on the above switch, %case1 and %continue blocks
; become dead in the original loop
;
; CHECK-NOT: case1:
case1:
br label %continue
; CHECK-NOT: {{^}}continue:
continue:
%iinc = add i32 %ii, 1
%icmp = icmp eq i32 %ii, 100
br i1 %icmp, label %inner, label %outer_continue
outer_continue:
%oinc = add i32 %oi, 1
%ocmp = icmp eq i32 %oi, 100
br i1 %ocmp, label %outer, label %get_out
get_out:
ret void
get_out2:
unreachable
}
;
; This comes from PR38778
; CHECK-LABEL: @Test2
define void @Test2(i32) {
header:
br label %loop
loop:
switch i32 %0, label %continue [
i32 -2147483648, label %check
i32 98, label %guarded1
i32 99, label %guarded2
]
; CHECK-NOT: {{^}}guarded1:
guarded1:
br i1 undef, label %continue, label %leave
guarded2:
br label %continue
check:
%val = add i32 0, 1
br i1 undef, label %continue, label %leave
continue:
br label %loop
leave:
%local = phi i32 [ 0, %guarded1 ], [ %val, %check ]
ret void
}
;
; Yet another test from PR38778
;
; CHECK-LABEL: @Test3
define void @Test3(i32) {
header:
br label %outer
outer:
%bad_input.i = icmp eq i32 %0, -2147483648
br label %inner
inner:
br i1 %bad_input.i, label %overflow, label %switchme
overflow:
br label %continue
switchme:
switch i32 %0, label %continue [
i32 88, label %go_out
i32 99, label %case2
]
; CHECK-NOT: {{^}}case2:
case2:
br label %continue
continue:
%local_11_92 = phi i32 [ 0, %switchme ], [ 18, %case2 ], [ 0, %overflow ]
br i1 undef, label %outer, label %inner
go_out:
unreachable
}