softfloat-native: add float32_is_nan()

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6002 c046a42c-6fe2-441c-8c8c-71466251a162

fpu/softfloat-native.c

diff --git a/fpu/softfloat-native.c b/fpu/softfloat-native.c
index e58551f..0b24bab 100644
--- a/fpu/softfloat-native.c
+++ b/fpu/softfloat-native.c
@@ -250,6 +250,15 @@
     return ( ( ( a>>22 ) & 0x1FF ) == 0x1FE ) && ( a & 0x003FFFFF );
 }
 
+int float32_is_nan( float32 a1 )
+{
+    float32u u;
+    uint64_t a;
+    u.f = a1;
+    a = u.i;
+    return ( 0xFF800000 < ( a<<1 ) );
+}
+
 /*----------------------------------------------------------------------------
 | Software IEC/IEEE double-precision conversion routines.
 *----------------------------------------------------------------------------*/

fpu/softfloat-native.h

diff --git a/fpu/softfloat-native.h b/fpu/softfloat-native.h
index b51c082..817a2a8 100644
--- a/fpu/softfloat-native.h
+++ b/fpu/softfloat-native.h
@@ -246,6 +246,7 @@
 int float32_compare( float32, float32 STATUS_PARAM );
 int float32_compare_quiet( float32, float32 STATUS_PARAM );
 int float32_is_signaling_nan( float32 );
+int float32_is_nan( float32 );
 
 INLINE float32 float32_abs(float32 a)
 {