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

1 files changed, 32 insertions, 0 deletions

diff --git a/clang/test/CodeGen/2008-08-07-AlignPadding1.c b/clang/test/CodeGen/2008-08-07-AlignPadding1.c
new file mode 100644
index 0000000..2bb2e61
--- /dev/null
+++ b/clang/test/CodeGen/2008-08-07-AlignPadding1.c
@@ -0,0 +1,32 @@
+/* RUN: %clang_cc1 %s -emit-llvm -triple x86_64-apple-darwin -o - | FileCheck %s
+
+The FE must generate padding here both at the end of each PyG_Head and
+between array elements.  Reduced from Python. */
+
+typedef union _gc_head {
+  struct {
+    union _gc_head *gc_next;
+    union _gc_head *gc_prev;
+    long gc_refs;
+  } gc;
+  int dummy __attribute__((aligned(16)));
+} PyGC_Head;
+
+struct gc_generation {
+  PyGC_Head head;
+  int threshold;
+  int count;
+};
+
+#define GEN_HEAD(n) (&generations[n].head)
+
+// The idea is that there are 6 undefs in this structure initializer to cover
+// the padding between elements.
+// CHECK: @generations = global [3 x %struct.gc_generation] [%struct.gc_generation { %union._gc_head { %struct.anon { %union._gc_head* getelementptr inbounds ([3 x %struct.gc_generation]* @generations, i32 0, i32 0, i32 0), %union._gc_head* getelementptr inbounds ([3 x %struct.gc_generation]* @generations, i32 0, i32 0, i32 0), i64 0 }, [8 x i8] undef }, i32 700, i32 0, [8 x i8] undef }, %struct.gc_generation { %union._gc_head { %struct.anon { %union._gc_head* bitcast (i8* getelementptr (i8* bitcast ([3 x %struct.gc_generation]* @generations to i8*), i64 48) to %union._gc_head*), %union._gc_head* bitcast (i8* getelementptr (i8* bitcast ([3 x %struct.gc_generation]* @generations to i8*), i64 48) to %union._gc_head*), i64 0 }, [8 x i8] undef }, i32 10, i32 0, [8 x i8] undef }, %struct.gc_generation { %union._gc_head { %struct.anon { %union._gc_head* bitcast (i8* getelementptr (i8* bitcast ([3 x %struct.gc_generation]* @generations to i8*), i64 96) to %union._gc_head*), %union._gc_head* bitcast (i8* getelementptr (i8* bitcast ([3 x %struct.gc_generation]* @generations to i8*), i64 96) to %union._gc_head*), i64 0 }, [8 x i8] undef }, i32 10, i32 0, [8 x i8] undef }]
+/* linked lists of container objects */
+struct gc_generation generations[3] = {
+        /* PyGC_Head,                           threshold,      count */
+        {{{GEN_HEAD(0), GEN_HEAD(0), 0}},       700,            0},
+        {{{GEN_HEAD(1), GEN_HEAD(1), 0}},       10,             0},
+        {{{GEN_HEAD(2), GEN_HEAD(2), 0}},       10,             0},
+};