(2/4) Add macros to support new OCP f8 modes

Author: Omar Almatov

softfloat/internals.h

@@ -86,6 +86,10 @@ int_fast64_t softfloat_roundMToI64( bool, uint32_t *, uint_fast8_t, bool );
 /*----------------------------------------------------------------------------
 *---------------------------------------------------------------------------*/
 #define f8ExpWidth softfloat_fp8ExpWidths[softfloat_fp8Mode]
+#define isE4M3NaNF8UI( a ) ((bool) ((((uint8_t) a) & 0x7F)  == 0x7F))
+#define isE5M2NaNF8UI( a ) ((bool) ((((uint8_t) a) & 0x7C) > 0x7C))
+#define isE5M2InfF8UI( a ) ((bool) ((((uint8_t) a) & 0x7C)  == 0x7C))
+#define signInfE5M2F8UI( sign ) (((uint8_t) (sign)<<7) | 0x7C)
 
 /*----------------------------------------------------------------------------
 *----------------------------------------------------------------------------*/

softfloat/specialize.h

@@ -113,6 +113,8 @@ struct commonNaN { char _unused; };
 | NaN, and returns the bit pattern of this value as an unsigned integer.
 *----------------------------------------------------------------------------*/
 #define softfloat_commonNaNToF8UI( aPtr ) ((uint_fast8_t) defaultNaNF8UI)
+#define softfloat_commonNaNToE4M3F8UI( aPtr ) ((uint_fast8_t) 0xFF)
+#define softfloat_commonNaNToE5M2F8UI( aPtr ) ((uint_fast8_t) 0XFF)
 
 /*----------------------------------------------------------------------------
 | Returns true when 16-bit unsigned integer `uiA' has the bit pattern of a