[tfaber] 68898: [CRT] - Rewrite _fpreset based on Wine. Fixes the last kernel32:thread test failure

Author: tfaber
Date: Tue Sep  1 14:57:30 2015
New Revision: 68898

URL: http://svn.reactos.org/svn/reactos?rev=68898&view=rev
Log:
[CRT]
- Rewrite _fpreset based on Wine. Fixes the last kernel32:thread test failure

Modified:
    trunk/reactos/lib/sdk/crt/float/i386/fpreset.c

Modified: trunk/reactos/lib/sdk/crt/float/i386/fpreset.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/lib/sdk/crt/float/i386/fpre...
==============================================================================
--- trunk/reactos/lib/sdk/crt/float/i386/fpreset.c	[iso-8859-1] (original)
+++ trunk/reactos/lib/sdk/crt/float/i386/fpreset.c	[iso-8859-1] Tue Sep  1 14:57:30 2015
@@ -1,11 +1,8 @@
 /*
- * COPYRIGHT:   See COPYING in the top level directory
+ * COPYRIGHT:   See COPYING.LIB in the top level directory
  * PROJECT:     ReactOS system libraries
- * FILE:        lib/crt/??????
- * PURPOSE:     Unknown
- * PROGRAMER:   Unknown
- * UPDATE HISTORY:
- *              25/11/05: Added license header
+ * PURPOSE:     Resets FPU state to the default
+ * PROGRAMER:   Thomas Faber [e-mail]
  */

#include <precomp.h>
@@ -15,9 +12,20 @@
  */
 void CDECL _fpreset(void)
 {
-#if defined(__GNUC__)
-  __asm__ __volatile__( "fninit" );
+    const unsigned int x86_cw = 0x27f;
+#ifdef _MSC_VER
+    __asm { fninit }
+    __asm { fldcw [x86_cw] }
 #else
-  __asm fninit;
+    __asm__ __volatile__( "fninit; fldcw %0" : : "m" (x86_cw) );
 #endif
+    if (IsProcessorFeaturePresent(PF_XMMI64_INSTRUCTIONS_AVAILABLE))
+    {
+          const unsigned long sse2_cw = 0x1f80;
+#ifdef _MSC_VER
+        __asm { ldmxcsr [sse2_cw] }
+#else
+        __asm__ __volatile__( "ldmxcsr %0" : : "m" (sse2_cw) );
+#endif
+    }
 }