softfloat/f64_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 f64_classify( float64_t a )
  10 {
  11     union ui64_f64 uA;
  12     uint_fast64_t uiA;
  13
  14     uA.f = a;
  15     uiA = uA.ui;
  16
  17     uint_fast16_t infOrNaN = expF64UI( uiA ) == 0x7FF;
  18     uint_fast16_t subnormalOrZero = expF64UI( uiA ) == 0;
  19     bool sign = signF64UI( uiA );
  20
  21     return
  22         (  sign && infOrNaN && fracF64UI( uiA ) == 0 )          << 0 |
  23         (  sign && !infOrNaN && !subnormalOrZero )              << 1 |
  24         (  sign && subnormalOrZero && fracF64UI( uiA ) )        << 2 |
  25         (  sign && subnormalOrZero && fracF64UI( uiA ) == 0 )   << 3 |
  26         ( !sign && infOrNaN && fracF64UI( uiA ) == 0 )          << 7 |
  27         ( !sign && !infOrNaN && !subnormalOrZero )              << 6 |
  28         ( !sign && subnormalOrZero && fracF64UI( uiA ) )        << 5 |
  29         ( !sign && subnormalOrZero && fracF64UI( uiA ) == 0 )   << 4 |
  30         ( isNaNF64UI( uiA ) &&  softfloat_isSigNaNF64UI( uiA )) << 8 |
  31         ( isNaNF64UI( uiA ) && !softfloat_isSigNaNF64UI( uiA )) << 9;
  32 }
  33