[PATCH] Add implementations of __readfs{byte, word, dword, qword} to Intrin.h

[Hans Wennborg]

  Addressed rnk's comments.

  Chandler: can you provide a pointer to the address space technique you mentioned?

Hi rnk, whunt,

http://llvm-reviews.chandlerc.com/D2606

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2606?vs=6606&id=6607#toc

Files:
  lib/Headers/Intrin.h

Index: lib/Headers/Intrin.h
===================================================================
--- lib/Headers/Intrin.h
+++ lib/Headers/Intrin.h
@@ -101,9 +101,13 @@
 unsigned long __readcr8(void);
 unsigned int __readdr(unsigned int);
 unsigned int __readeflags(void);
+static __inline__
 unsigned char __readfsbyte(unsigned long);
+static __inline__
 unsigned long __readfsdword(unsigned long);
+static __inline__
 unsigned __int64 __readfsqword(unsigned long);
+static __inline__
 unsigned short __readfsword(unsigned long);
 unsigned __int64 __readmsr(unsigned long);
 unsigned __int64 __readpmc(unsigned long);
@@ -767,6 +771,33 @@
   __asm__ volatile ("" : : : "memory");
 }
 /*----------------------------------------------------------------------------*\
+|* readfs
+\*----------------------------------------------------------------------------*/
+static __inline__ unsigned char __attribute__((__always_inline__, __nodebug__))
+__readfsbyte(unsigned long __offset) {
+  unsigned char __result;
+  __asm__ ("movb %%fs:(%1), %0" : "=r" (__result) : "r" (__offset));
+  return __result;
+}
+static __inline__ unsigned long __attribute__((__always_inline__, __nodebug__))
+__readfsdword(unsigned long __offset) {
+  unsigned long __result;
+  __asm__ ("movl %%fs:(%1), %0" : "=r" (__result) : "r" (__offset));
+  return __result;
+}
+static __inline__ unsigned __int64 __attribute__((__always_inline__, __nodebug__))
+__readfsqword(unsigned long __offset) {
+  unsigned __int64 __result;
+  __asm__ ("movq %%fs:(%1), %0" : "=r" (__result) : "r" (__offset));
+  return __result;
+}
+static __inline__ unsigned short __attribute__((__always_inline__, __nodebug__))
+__readfsword(unsigned long __offset) {
+  unsigned short __result;
+  __asm__ ("movw %%fs:(%1), %0" : "=r" (__result) : "r" (__offset));
+  return __result;
+}
+/*----------------------------------------------------------------------------*\
 |* Misc
 \*----------------------------------------------------------------------------*/
 static __inline__ void * __attribute__((__always_inline__, __nodebug__))
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