[PATCH] Implement __readeflags and __writeeflags intrinsics

[Alexey Volkov]

Hi all,

This patch implements __readeflags and __writeeflags intrinsics for x86 arch.

Alexey Volkov
Intel Corporation

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

Files:
  lib/Headers/immintrin.h

Index: lib/Headers/immintrin.h
===================================================================
--- lib/Headers/immintrin.h
+++ lib/Headers/immintrin.h
@@ -115,4 +115,58 @@
 #include <shaintrin.h>
 #endif
 
+/* These intrinsics are defined in Intrin.h on Windows. */
+#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
+#endif /* _MSC_VER */
+
 #endif /* __IMMINTRIN_H */
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