blob: 180abde3cb1d5919420e3859f7fd88ab6f20404a [file] [log] [blame]
#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "specialize.h"
#include "softfloat.h"
uint_fast16_t f64_classify( float64_t a )
{
union ui64_f64 uA;
uint_fast64_t uiA;
uA.f = a;
uiA = uA.ui;
uint_fast16_t infOrNaN = expF64UI( uiA ) == 0x7FF;
uint_fast16_t subnormalOrZero = expF64UI( uiA ) == 0;
bool sign = signF64UI( uiA );
bool fracZero = fracF64UI( uiA ) == 0;
bool isNaN = isNaNF64UI( uiA );
bool isSNaN = softfloat_isSigNaNF64UI( uiA );
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;
}