clang/test/CodeGen/pointer-signext.c

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