MS intrinsics: implement __readgs{byte,word,dword,qword} (PR19054)
llvm-svn: 203715
diff --git a/clang/lib/Headers/Intrin.h b/clang/lib/Headers/Intrin.h
index 54e0899..baba633 100644
--- a/clang/lib/Headers/Intrin.h
+++ b/clang/lib/Headers/Intrin.h
@@ -322,8 +322,12 @@
__int64 __mulh(__int64, __int64);
static __inline__
unsigned __int64 __popcnt64(unsigned __int64);
+static __inline__
unsigned char __readgsbyte(unsigned long);
+static __inline__
unsigned long __readgsdword(unsigned long);
+static __inline__
+unsigned __int64 __readgsqword(unsigned long);
unsigned short __readgsword(unsigned long);
unsigned __int64 __shiftleft128(unsigned __int64 _LowPart,
unsigned __int64 _HighPart,
@@ -818,14 +822,15 @@
}
#endif
/*----------------------------------------------------------------------------*\
-|* readfs
-|* (Pointers in address space #257 are relative to the FS segment register.)
+|* readfs, readgs
+|* (Pointers in address space #256 and #257 are relative to the GS and FS
+|* segment registers, respectively.)
\*----------------------------------------------------------------------------*/
-#ifdef __i386__
#define __ptr_to_addr_space(__addr_space_nbr, __type, __offset) \
((volatile __type __attribute__((__address_space__(__addr_space_nbr)))*) \
(__offset))
+#ifdef __i386__
static __inline__ unsigned char __attribute__((__always_inline__, __nodebug__))
__readfsbyte(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned char, __offset);
@@ -842,8 +847,26 @@
__readfsword(unsigned long __offset) {
return *__ptr_to_addr_space(257, unsigned short, __offset);
}
-#undef __ptr_to_addr_space
#endif
+#ifdef __x86_64__
+static __inline__ unsigned char __attribute__((__always_inline__, __nodebug__))
+__readgsbyte(unsigned long __offset) {
+ return *__ptr_to_addr_space(256, unsigned char, __offset);
+}
+static __inline__ unsigned long __attribute__((__always_inline__, __nodebug__))
+__readgsdword(unsigned long __offset) {
+ return *__ptr_to_addr_space(256, unsigned long, __offset);
+}
+static __inline__ unsigned __int64 __attribute__((__always_inline__, __nodebug__))
+__readgsqword(unsigned long __offset) {
+ return *__ptr_to_addr_space(256, unsigned __int64, __offset);
+}
+static __inline__ unsigned short __attribute__((__always_inline__, __nodebug__))
+__readgsword(unsigned long __offset) {
+ return *__ptr_to_addr_space(256, unsigned short, __offset);
+}
+#endif
+#undef __ptr_to_addr_space
/*----------------------------------------------------------------------------*\
|* Misc
\*----------------------------------------------------------------------------*/