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1; RUN: opt -S -basicaa -objc-arc-aa -gvn < %s | FileCheck %s
2
3@x = common global i8* null, align 8
4
5declare i8* @objc_retain(i8*)
6declare i32 @objc_sync_enter(i8*)
7declare i32 @objc_sync_exit(i8*)
8
9; GVN should be able to eliminate this redundant load, with ARC-specific
10; alias analysis.
11
12; CHECK: define i8* @test0(i32 %n)
13; CHECK-NEXT: entry:
14; CHECK-NEXT: %s = load i8*, i8** @x
15; CHECK-NOT: load
16; CHECK: ret i8* %s
17; CHECK-NEXT: }
18define i8* @test0(i32 %n) nounwind {
19entry:
20  %s = load i8*, i8** @x
21  %0 = tail call i8* @objc_retain(i8* %s) nounwind
22  %t = load i8*, i8** @x
23  ret i8* %t
24}
25
26; GVN should not be able to eliminate this redundant load, with ARC-specific
27; alias analysis.
28
29; CHECK-LABEL: define i8* @test1(
30; CHECK: load
31; CHECK: load
32; CHECK: ret i8* %t
33; CHECK: }
34define i8* @test1(i32 %n) nounwind {
35entry:
36  %s = load i8*, i8** @x
37  %0 = call i32 @objc_sync_enter(i8* %s)
38  %t = load i8*, i8** @x
39  %1 = call i32 @objc_sync_exit(i8* %s)
40  ret i8* %t
41}
42