softfloat/f64_eq.c


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// See LICENSE.SoftFloat for license details.


#include <stdbool.h>
#include <stdint.h>
#include "platform.h"
#include "internals.h"
#include "specialize.h"
#include "softfloat.h"

bool f64_eq( float64_t a, float64_t b )
{
    union ui64_f64 uA;
    uint_fast64_t uiA;
    union ui64_f64 uB;
    uint_fast64_t uiB;

    uA.f = a;
    uiA = uA.ui;
    uB.f = b;
    uiB = uB.ui;
    if (
           ( ( expF64UI( uiA ) == 0x7FF ) && fracF64UI( uiA ) )
        || ( ( expF64UI( uiB ) == 0x7FF ) && fracF64UI( uiB ) )
    ) {
        if (
            softfloat_isSigNaNF64UI( uiA ) || softfloat_isSigNaNF64UI( uiB )
        ) {
            softfloat_raiseFlags( softfloat_flag_invalid );
        }
        return false;
    }
    return
        ( uiA == uiB ) || ! ( ( uiA | uiB ) & UINT64_C( 0x7FFFFFFFFFFFFFFF ) );

}