[sim] specialized softfloat for riscv

softfloat/SoftFloat-3/source/riscv/s_commonNaNToF32UI.c

@@ -11,7 +11,7 @@
 uint_fast32_t softfloat_commonNaNToF32UI( struct commonNaN a )
 {
 
-    return (uint_fast32_t) a.sign<<31 | 0x7FC00000 | a.v64>>41;
+    return (uint_fast32_t) a.sign<<31 | 0x7FFFFFFF;
 
 }
 

softfloat/SoftFloat-3/source/riscv/s_commonNaNToF64UI.c

@@ -12,8 +12,7 @@ uint_fast64_t softfloat_commonNaNToF64UI( struct commonNaN a )
 {
 
     return
-        (uint_fast64_t) a.sign<<63 | UINT64_C( 0x7FF8000000000000 )
-            | a.v64>>12;
+        (uint_fast64_t) a.sign<<63 | UINT64_C( 0x7FFFFFFFFFFFFFFF );
 
 }
 

softfloat/SoftFloat-3/source/riscv/s_f32UIToCommonNaN.c

@@ -17,7 +17,7 @@ struct commonNaN softfloat_f32UIToCommonNaN( uint_fast32_t uiA )
         softfloat_raiseFlags( softfloat_flag_invalid );
     }
     z.sign = uiA>>31;
-    z.v64 = (uint_fast64_t) uiA<<41;
+    z.v64 = (uint_fast64_t) 0x7FFFF <<41;
     z.v0 = 0;
     return z;
 

softfloat/SoftFloat-3/source/riscv/s_f64UIToCommonNaN.c

@@ -17,7 +17,7 @@ struct commonNaN softfloat_f64UIToCommonNaN( uint_fast64_t uiA )
         softfloat_raiseFlags( softfloat_flag_invalid );
     }
     z.sign = uiA>>63;
-    z.v64 = uiA<<12;
+    z.v64 = (uint_fast64_t) 0xFFFFFFFFFFFFF <<12;
     z.v0 = 0;
     return z;
 

softfloat/SoftFloat-3/source/riscv/specialize.h

@@ -37,7 +37,7 @@ these four paragraphs for those parts of this code that are retained.
 
 /*----------------------------------------------------------------------------
 *----------------------------------------------------------------------------*/
-#define init_detectTininess softfloat_tininess_afterRounding;
+#define init_detectTininess softfloat_tininess_beforeRounding;
 
 /*----------------------------------------------------------------------------
 | Structure used to transfer NaN representations from one format to another.
@@ -50,7 +50,7 @@ struct commonNaN {
 /*----------------------------------------------------------------------------
 | The pattern for a default generated single-precision NaN.
 *----------------------------------------------------------------------------*/
-#define defaultNaNF32UI 0xFFC00000
+#define defaultNaNF32UI 0xFFFFFFFF
 
 /*----------------------------------------------------------------------------
 | Returns 1 if the single-precision floating-point value `a' is a signaling
@@ -68,7 +68,7 @@ bool softfloat_isSigNaNF32UI( uint_fast32_t );
 struct commonNaN softfloat_f32UIToCommonNaN( uint_fast32_t );
 #if defined INLINE_LEVEL && ( 1 <= INLINE_LEVEL )
 INLINE uint_fast32_t softfloat_commonNaNToF32UI( struct commonNaN a )
-    { return (uint_fast32_t) a.sign<<31 | 0x7FC00000 | a.v64>>41; }
+    { return (uint_fast32_t) a.sign<<31 | 0x7FFFFFFF; }
 #else
 uint_fast32_t softfloat_commonNaNToF32UI( struct commonNaN );
 #endif