[PATCH] Implement __readeflags and __writeeflags intrinsics

[Alexey Volkov]

  I added ia32intrin.h file with __readeflags and __writeeflags intrinsics.

Hi echristo, rnk, whunt,

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

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2468?vs=6965&id=7427#toc

Files:
  lib/Headers/ia32intrin.h
  lib/Headers/x86intrin.h

Index: lib/Headers/ia32intrin.h
===================================================================
--- /dev/null
+++ lib/Headers/ia32intrin.h
@@ -0,0 +1,82 @@
+/* ===-------- ia32intrin.h ---------------------------------------------------===
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ *
+ *===-----------------------------------------------------------------------===
+ */
+
+#ifndef __X86INTRIN_H
+#error "Never use <ia32intrin.h> directly; include <x86intrin.h> instead."
+#endif
+
+#ifndef __IA32INTRIN_H
+#define __IA32INTRIN_H
+
+#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 /* !__x86_64__ */
+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 /* !__x86_64__ */
+
+#endif /* __IA32INTRIN_H */
Index: lib/Headers/x86intrin.h
===================================================================
--- lib/Headers/x86intrin.h
+++ lib/Headers/x86intrin.h
@@ -24,6 +24,8 @@
 #ifndef __X86INTRIN_H
 #define __X86INTRIN_H
 
+#include <ia32intrin.h>
+
 #include <immintrin.h>
 
 #ifdef __3dNOW__
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