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
|
; RUN: opt < %s -O1 -S | FileCheck %s
; The attribute nomerge prevents the 3 bar() calls from being sunk/hoisted into
; one inside a function. Check that there are still 3 tail calls.
; Test case for preventing sinking
; CHECK-LABEL: define void @sink
; CHECK: if.then:
; CHECK-NEXT: tail call void @bar()
; CHECK: if.then2:
; CHECK-NEXT: tail call void @bar()
; CHECK: if.end3:
; CHECK-NEXT: tail call void @bar()
define void @sink(i32 %i) {
entry:
switch i32 %i, label %if.end3 [
i32 5, label %if.then
i32 7, label %if.then2
]
if.then:
tail call void @bar() #0
br label %if.end3
if.then2:
tail call void @bar() #0
br label %if.end3
if.end3:
tail call void @bar() #0
ret void
}
; Test case for preventing hoisting
; CHECK-LABEL: define void @hoist
; CHECK: if.then:
; CHECK-NEXT: tail call void @bar()
; CHECK: if.then2:
; CHECK-NEXT: tail call void @bar()
; CHECK: if.end:
; CHECK-NEXT: tail call void @bar()
define void @hoist(i32 %i) {
entry:
%i.addr = alloca i32, align 4
store i32 %i, ptr %i.addr, align 4
%0 = load i32, ptr %i.addr, align 4
%cmp = icmp eq i32 %0, 5
br i1 %cmp, label %if.then, label %if.else
if.then:
tail call void @bar() #1
unreachable
if.else:
%1 = load i32, ptr %i.addr, align 4
%cmp1 = icmp eq i32 %i, 7
br i1 %cmp1, label %if.then2, label %if.end
if.then2:
tail call void @bar() #1
unreachable
if.end:
tail call void @bar() #1
unreachable
}
declare void @bar()
attributes #0 = { nomerge }
attributes #1 = { noreturn nomerge }
|
