diff options
Diffstat (limited to 'clang/test/CodeGen/may-alias.c')
| -rw-r--r-- | clang/test/CodeGen/may-alias.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/clang/test/CodeGen/may-alias.c b/clang/test/CodeGen/may-alias.c new file mode 100644 index 0000000..b73ee15 --- /dev/null +++ b/clang/test/CodeGen/may-alias.c @@ -0,0 +1,30 @@ +// RUN: %clang_cc1 -Werror -triple i386-unknown-unknown -emit-llvm -O1 -disable-llvm-optzns -o %t %s +// RUN: FileCheck < %t %s + +// Types with the may_alias attribute should be considered equivalent +// to char for aliasing. + +typedef int __attribute__((may_alias)) aliasing_int; + +void test0(aliasing_int *ai, int *i) +{ +// CHECK: store i32 0, i32* %{{.*}}, !tbaa !1 + *ai = 0; +// CHECK: store i32 1, i32* %{{.*}}, !tbaa !3 + *i = 1; +} + +// PR9307 +struct Test1 { int x; }; +struct Test1MA { int x; } __attribute__((may_alias)); +void test1(struct Test1MA *p1, struct Test1 *p2) { + // CHECK: store i32 2, i32* {{%.*}}, !tbaa !1 + p1->x = 2; + // CHECK: store i32 3, i32* {{%.*}}, !tbaa !3 + p2->x = 3; +} + +// CHECK: !0 = metadata !{metadata !"any pointer", metadata !1} +// CHECK: !1 = metadata !{metadata !"omnipotent char", metadata !2} +// CHECK: !2 = metadata !{metadata !"Simple C/C++ TBAA"} +// CHECK: !3 = metadata !{metadata !"int", metadata !1} |