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 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)); 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", null} 30 // CHECK: !3 = metadata !{metadata !"int", metadata !1} 31
