[PATCH] Implement __readeflags and __writeeflags intrinsics

[Alexey Volkov]

  I moved intrinsics to Intrin.h into non-Windows section since Windows part of header cannot be compiled on Linux.
  I also removed include_next directive for Linux.

http://llvm-reviews.chandlerc.com/D2468

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2468?vs=6263&id=6313#toc

Files:
  lib/Headers/Intrin.h

Index: lib/Headers/Intrin.h
===================================================================
--- lib/Headers/Intrin.h
+++ lib/Headers/Intrin.h
@@ -21,17 +21,65 @@
  *===-----------------------------------------------------------------------===
  */
 
-/* Only include this if we're compiling for the windows platform. */
-#ifndef _MSC_VER
-#include_next <Intrin.h>
-#else
-
 #ifndef __INTRIN_H
 #define __INTRIN_H
 
 /* First include the standard intrinsics. */
 #include <x86intrin.h>
 
+#ifndef _MSC_VER
+#ifdef __x86_64__
+static __inline__ unsigned long long __attribute__((__always_inline__, __nodebug__))
+__readeflags(void)
+{
+  unsigned long long res = 0;
+  __asm__ __volatile__ ("pushf\n\t"
+                        "popq %0\n"
+                        :"=r"(res)
+                        :
+                        :
+                       );
+  return res;
+}
+
+static __inline__ void __attribute__((__always_inline__, __nodebug__))
+__writeeflags(unsigned long long __f)
+{
+  __asm__ __volatile__ ("pushq %0\n\t"
+                        "popf\n"
+                        :
+                        :"r"(__f)
+                        :"flags"
+                       );
+}
+
+#else
+static __inline__ unsigned int __attribute__((__always_inline__, __nodebug__))
+__readeflags(void)
+{
+  unsigned int res = 0;
+  __asm__ __volatile__ ("pushf\n\t"
+                        "popl %0\n"
+                        :"=r"(res)
+                        :
+                        :
+                       );
+  return res;
+}
+
+static __inline__ void __attribute__((__always_inline__, __nodebug__))
+__writeeflags(unsigned int __f)
+{
+  __asm__ __volatile__ ("pushl %0\n\t"
+                        "popf\n"
+                        :
+                        :"r"(__f)
+                        :"flags"
+                       );
+}
+#endif
+#else
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -780,5 +828,5 @@
 }
 #endif
 
-#endif /* __INTRIN_H */
 #endif /* _MSC_VER */
+#endif /* __INTRIN_H */
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