vendor/clang/clang-r126079

1 files changed, 32 insertions, 0 deletions

diff --git a/test/CodeGen/pointer-signext.c b/test/CodeGen/pointer-signext.c
new file mode 100644
index 0000000000000..e809effb2b100
--- /dev/null
+++ b/test/CodeGen/pointer-signext.c
@@ -0,0 +1,32 @@
+// RUN: %clang_cc1 -triple x86_64-pc-win32 -emit-llvm -O2 -o - %s | FileCheck %s
+
+// Under Windows 64, int and long are 32-bits.  Make sure pointer math doesn't
+// cause any sign extensions.
+
+// CHECK:      [[P:%.*]] = add i64 %param, -8
+// CHECK-NEXT: [[Q:%.*]] = inttoptr i64 [[P]] to [[R:%.*\*]]
+// CHECK-NEXT: {{%.*}} = getelementptr inbounds [[R]] [[Q]], i64 0, i32 0
+
+#define CR(Record, TYPE, Field) \
+  ((TYPE *) ((unsigned char *) (Record) - (unsigned char *) &(((TYPE *) 0)->Field)))
+
+typedef struct _LIST_ENTRY {
+  struct _LIST_ENTRY  *ForwardLink;
+  struct _LIST_ENTRY  *BackLink;
+} LIST_ENTRY;
+
+typedef struct {
+  unsigned long long    Signature;
+  LIST_ENTRY            Link;
+} MEMORY_MAP;
+
+int test(unsigned long long param)
+{
+  LIST_ENTRY      *Link;
+  MEMORY_MAP      *Entry;
+
+  Link = (LIST_ENTRY *) param;
+
+  Entry = CR (Link, MEMORY_MAP, Link);
+  return (int) Entry->Signature;
+}