1 /* RUN: %clang_cc1 %s -emit-llvm -triple x86_64-apple-darwin -o - | FileCheck %s
2 
3 The FE must generate padding here both at the end of each PyG_Head and
4 between array elements.  Reduced from Python. */
5 
6 typedef union _gc_head {
7   struct {
8     union _gc_head *gc_next;
9     union _gc_head *gc_prev;
10     long gc_refs;
11   } gc;
12   int dummy __attribute__((aligned(16)));
13 } PyGC_Head;
14 
15 struct gc_generation {
16   PyGC_Head head;
17   int threshold;
18   int count;
19 };
20 
21 #define GEN_HEAD(n) (&generations[n].head)
22 
23 // The idea is that there are 6 undefs in this structure initializer to cover
24 // the padding between elements.
25 // 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], [3 x %struct.gc_generation]* @generations, i32 0, i32 0, i32 0), %union._gc_head* getelementptr inbounds ([3 x %struct.gc_generation], [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, i8* bitcast ([3 x %struct.gc_generation]* @generations to i8*), i64 48) to %union._gc_head*), %union._gc_head* bitcast (i8* getelementptr (i8, 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, i8* bitcast ([3 x %struct.gc_generation]* @generations to i8*), i64 96) to %union._gc_head*), %union._gc_head* bitcast (i8* getelementptr (i8, 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 }]
26 /* linked lists of container objects */
27 struct gc_generation generations[3] = {
28         /* PyGC_Head,                           threshold,      count */
29         {{{GEN_HEAD(0), GEN_HEAD(0), 0}},       700,            0},
30         {{{GEN_HEAD(1), GEN_HEAD(1), 0}},       10,             0},
31         {{{GEN_HEAD(2), GEN_HEAD(2), 0}},       10,             0},
32 };
33