Update vector FP classify to support FP8

Author: rbuchner-aril

softfloat/f8_classify.c

@@ -0,0 +1,34 @@
+#include <stdbool.h>
+#include <stdint.h>
+#include "platform.h"
+#include "internals.h"
+#include "specialize.h"
+#include "softfloat.h"
+
+uint_fast16_t f8_classify( float8_t a )
+{
+    union ui8_f8 uA;
+    uint_fast16_t uiA;
+
+    uA.f = a;
+    uiA = uA.ui;
+
+    uint_fast16_t infOrNaN = isInfF8UI(uiA) || isNaNF8UI(uiA);
+    uint_fast16_t subnormalOrZero = expF8UI( uiA ) == 0;
+    bool sign = signF8UI( uiA );
+    bool fracZero = fracF8UI( uiA ) == 0;
+    bool isNaN = isNaNF8UI( uiA );
+    bool isSNaN = false;
+
+    return
+        (  sign && infOrNaN && fracZero )          << 0 |
+        (  sign && !infOrNaN && !subnormalOrZero ) << 1 |
+        (  sign && subnormalOrZero && !fracZero )  << 2 |
+        (  sign && subnormalOrZero && fracZero )   << 3 |
+        ( !sign && infOrNaN && fracZero )          << 7 |
+        ( !sign && !infOrNaN && !subnormalOrZero ) << 6 |
+        ( !sign && subnormalOrZero && !fracZero )  << 5 |
+        ( !sign && subnormalOrZero && fracZero )   << 4 |
+        ( isNaN &&  isSNaN )                       << 8 |
+        ( isNaN && !isSNaN )                       << 9;
+}

softfloat/softfloat.h

@@ -159,6 +159,7 @@ uint_fast16_t f8_to_ui16( float8_t, uint_fast8_t, bool );
 float8_t f8_sub( float8_t, float8_t );
 float8_t f8_add( float8_t, float8_t );
 float8_t f8_mulAdd( float8_t, float8_t , float8_t );
+uint_fast16_t f8_classify( float8_t );
 
 float8_t f8_emulation_3_operands(float8_t a8, float8_t b8, float8_t c8, float16_t (*operation)(float16_t, float16_t, float16_t));
 float8_t f8_emulation_2_operands(float8_t a8, float8_t b8, float16_t (*operation)(float16_t, float16_t));

softfloat/softfloat.mk.in

@@ -48,6 +48,7 @@ softfloat_c_srcs = \
 	f16_lt_quiet.c \
 	f16_mulAdd.c \
 	f16_mul.c \
+	f8_classify.c \
 	f8_add.c \
 	f8_sub.c \
 	f8_mul.c \