xref: /aosp_15_r20/external/clang/test/CodeGen/pointer-signext.c (revision 67e74705e28f6214e480b399dd47ea732279e315) 
1*67e74705SXin Li // RUN: %clang_cc1 -triple x86_64-pc-win32 -emit-llvm -O2 -o - %s | FileCheck %s
2*67e74705SXin Li 
3*67e74705SXin Li // Under Windows 64, int and long are 32-bits.  Make sure pointer math doesn't
4*67e74705SXin Li // cause any sign extensions.
5*67e74705SXin Li 
6*67e74705SXin Li // CHECK:      [[P:%.*]] = add i64 %param, -8
7*67e74705SXin Li // CHECK-NEXT: [[Q:%.*]] = inttoptr i64 [[P]] to [[R:%.*]]*
8*67e74705SXin Li // CHECK-NEXT: {{%.*}} = getelementptr inbounds [[R]], [[R]]* [[Q]], i64 0, i32 0
9*67e74705SXin Li 
10*67e74705SXin Li #define CR(Record, TYPE, Field) \
11*67e74705SXin Li   ((TYPE *) ((unsigned char *) (Record) - (unsigned char *) &(((TYPE *) 0)->Field)))
12*67e74705SXin Li 
13*67e74705SXin Li typedef struct _LIST_ENTRY {
14*67e74705SXin Li   struct _LIST_ENTRY  *ForwardLink;
15*67e74705SXin Li   struct _LIST_ENTRY  *BackLink;
16*67e74705SXin Li } LIST_ENTRY;
17*67e74705SXin Li 
18*67e74705SXin Li typedef struct {
19*67e74705SXin Li   unsigned long long    Signature;
20*67e74705SXin Li   LIST_ENTRY            Link;
21*67e74705SXin Li } MEMORY_MAP;
22*67e74705SXin Li 
test(unsigned long long param)23*67e74705SXin Li int test(unsigned long long param)
24*67e74705SXin Li {
25*67e74705SXin Li   LIST_ENTRY      *Link;
26*67e74705SXin Li   MEMORY_MAP      *Entry;
27*67e74705SXin Li 
28*67e74705SXin Li   Link = (LIST_ENTRY *) param;
29*67e74705SXin Li 
30*67e74705SXin Li   Entry = CR (Link, MEMORY_MAP, Link);
31*67e74705SXin Li   return (int) Entry->Signature;
32*67e74705SXin Li }
33