softfloat/f32_classify.c

   1
   2 #include <stdbool.h>
   3 #include <stdint.h>
   4 #include "platform.h"
   5 #include "internals.h"
   6 #include "specialize.h"
   7 #include "softfloat.h"
   8
   9 uint_fast16_t f32_classify( float32_t a )
  10 {
  11     union ui32_f32 uA;
  12     uint_fast32_t uiA;
  13
  14     uA.f = a;
  15     uiA = uA.ui;
  16
  17     uint_fast16_t infOrNaN = expF32UI( uiA ) == 0xFF;
  18     uint_fast16_t subnormalOrZero = expF32UI( uiA ) == 0;
  19     bool sign = signF32UI( uiA );
  20     bool fracZero = fracF32UI( uiA ) == 0;
  21     bool isNaN = isNaNF32UI( uiA );
  22     bool isSNaN = softfloat_isSigNaNF32UI( uiA );
  23
  24     return
  25         (  sign && infOrNaN && fracZero )          << 0 |
  26         (  sign && !infOrNaN && !subnormalOrZero ) << 1 |
  27         (  sign && subnormalOrZero && !fracZero )  << 2 |
  28         (  sign && subnormalOrZero && fracZero )   << 3 |
  29         ( !sign && infOrNaN && fracZero )          << 7 |
  30         ( !sign && !infOrNaN && !subnormalOrZero ) << 6 |
  31         ( !sign && subnormalOrZero && !fracZero )  << 5 |
  32         ( !sign && subnormalOrZero && fracZero )   << 4 |
  33         ( isNaN &&  isSNaN )                       << 8 |
  34         ( isNaN && !isSNaN )                       << 9;
  35 }
  36