Add the clang library to the repo (with some of my changes, too).

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}