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Fix Windows64 target info so pointer arithmetic is done correctly, and no sign extension code is emitted: PtrDiffType needs to be a signed long long. Add a corresponding test case. 

llvm-svn: 113910
This commit is contained in:
Cameron Esfahani 2010-09-15 00:28:12 +00:00
parent f657b639fd
commit eb85650e67
2 changed files with 35 additions and 0 deletions
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3
clang/lib/Basic/Targets.cpp
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@ -1483,6 +1483,9 @@ public:
IntMaxType = SignedLongLong;
UIntMaxType = UnsignedLongLong;
Int64Type = SignedLongLong;
SizeType = UnsignedLongLong;
PtrDiffType = SignedLongLong;
IntPtrType = SignedLongLong;
}
virtual void getTargetDefines(const LangOptions &Opts,
MacroBuilder &Builder) const {

32
clang/test/CodeGen/pointer-signext.c Normal file
View File

@ -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: %sub.ptr.sub = add i64 %param, -8
// CHECK: %0 = inttoptr i64 %sub.ptr.sub to %struct.anon*
// CHECK: %tmp3 = getelementptr inbounds %struct.anon* %0, 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;
}