1 // RUN: %clang_cc1 -Werror -triple i386-unknown-unknown -emit-llvm -O1 -disable-llvm-optzns -o %t %s
2 // RUN: FileCheck < %t %s
3
4 // Types with the may_alias attribute should be considered equivalent
5 // to char for aliasing.
6
7 typedef int __attribute__((may_alias)) aliasing_int;
8
test0(aliasing_int * ai,int * i)9 void test0(aliasing_int *ai, int *i)
10 {
11 // CHECK: store i32 0, i32* %{{.*}}, !tbaa !1
12 *ai = 0;
13 // CHECK: store i32 1, i32* %{{.*}}, !tbaa !3
14 *i = 1;
15 }
16
17 // PR9307
18 struct Test1 { int x; };
19 struct Test1MA { int x; } __attribute__((may_alias));
test1(struct Test1MA * p1,struct Test1 * p2)20 void test1(struct Test1MA *p1, struct Test1 *p2) {
21 // CHECK: store i32 2, i32* {{%.*}}, !tbaa !1
22 p1->x = 2;
23 // CHECK: store i32 3, i32* {{%.*}}, !tbaa !3
24 p2->x = 3;
25 }
26
27 // CHECK: !0 = metadata !{metadata !"any pointer", metadata !1}
28 // CHECK: !1 = metadata !{metadata !"omnipotent char", metadata !2}
29 // CHECK: !2 = metadata !{metadata !"Simple C/C++ TBAA"}
30 // CHECK: !3 = metadata !{metadata !"int", metadata !1}
31