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
|
; RUN: opt -codegenprepare -S -mtriple=x86_64-linux < %s | FileCheck %s
; The ret instruction can be duplicated into BB case2 even though there is an
; intermediate BB exit1 and call to llvm.assume.
@ptr = external global i8*, align 8
; CHECK: %ret1 = tail call i8* @qux()
; CHECK-NEXT: ret i8* %ret1
; CHECK: %ret2 = tail call i8* @bar()
; CHECK-NEXT: ret i8* %ret2
define i8* @foo(i64 %size, i64 %v1, i64 %v2) {
entry:
%a = alloca i8
call void @llvm.lifetime.start.p0i8(i64 -1, i8* %a) nounwind
%cmp1 = icmp ult i64 %size, 1025
br i1 %cmp1, label %if.end, label %case1
case1:
%ret1 = tail call i8* @qux()
br label %exit2
if.end:
%cmp2 = icmp ult i64 %v1, %v2
br i1 %cmp2, label %case3, label %case2
case2:
%ret2 = tail call i8* @bar()
br label %exit1
case3:
%ret3 = load i8*, i8** @ptr, align 8
br label %exit1
exit1:
%retval1 = phi i8* [ %ret2, %case2 ], [ %ret3, %case3 ]
%cmp3 = icmp ne i8* %retval1, null
tail call void @llvm.assume(i1 %cmp3)
br label %exit2
exit2:
%retval2 = phi i8* [ %ret1, %case1 ], [ %retval1, %exit1 ]
call void @llvm.lifetime.end.p0i8(i64 -1, i8* %a) nounwind
ret i8* %retval2
}
declare void @llvm.assume(i1)
declare i8* @qux()
declare i8* @bar()
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) nounwind
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) nounwind
|
