f16_to_ui64.c File Reference

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

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Functions
uint_fast64_t	f16_to_ui64 (float16_t a, uint_fast8_t roundingMode, bool exact)

Function Documentation

f16_to_ui64()

uint_fast64_t f16_to_ui64	(	float16_t	a,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 44 of file f16_to_ui64.c.

{
    union ui16_f16 uA;
    uint_fast16_t uiA;
    bool sign;
    int_fast8_t exp;
    uint_fast16_t frac;
    uint_fast32_t sig32;
    int_fast8_t shiftDist;
#ifndef SOFTFLOAT_FAST_INT64
    uint32_t extSig[3];
#endif
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    sign = signF16UI( uiA );
    exp  = expF16UI( uiA );
    frac = fracF16UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp == 0x1F ) {
        softfloat_raiseFlags( softfloat_flag_invalid );
        return
            frac ? ui64_fromNaN
                : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sig32 = frac;
    if ( exp ) {
        sig32 |= 0x0400;
        shiftDist = exp - 0x19;
        if ( (0 <= shiftDist) && ! sign ) {
            return sig32<<shiftDist;
        }
        shiftDist = exp - 0x0D;
        if ( 0 < shiftDist ) sig32 <<= shiftDist;
    }
#ifdef SOFTFLOAT_FAST_INT64
    return
        softfloat_roundToUI64(
            sign, sig32>>12, (uint_fast64_t) sig32<<52, roundingMode, exact );
#else
    extSig[indexWord( 3, 2 )] = 0;
    extSig[indexWord( 3, 1 )] = sig32>>12;
    extSig[indexWord( 3, 0 )] = sig32<<20;
    return softfloat_roundMToUI64( sign, extSig, roundingMode, exact );
#endif
 
}

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