f128_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	f128_to_ui64 (float128_t a, uint_fast8_t roundingMode, bool exact)

Function Documentation

f128_to_ui64()

uint_fast64_t f128_to_ui64	(	float128_t	a,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 45 of file f128_to_ui64.c.

{
    union ui128_f128 uA;
    uint_fast64_t uiA64, uiA0;
    bool sign;
    int_fast32_t exp;
    uint_fast64_t sig64, sig0;
    int_fast32_t shiftDist;
    struct uint128 sig128;
    struct uint64_extra sigExtra;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA64 = uA.ui.v64;
    uiA0  = uA.ui.v0;
    sign  = signF128UI64( uiA64 );
    exp   = expF128UI64( uiA64 );
    sig64 = fracF128UI64( uiA64 );
    sig0  = uiA0;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0x402F - exp;
    if ( shiftDist <= 0 ) {
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        if ( shiftDist < -15 ) {
            softfloat_raiseFlags( softfloat_flag_invalid );
            return
                (exp == 0x7FFF) && (sig64 | sig0) ? ui64_fromNaN
                    : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
        }
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        sig64 |= UINT64_C( 0x0001000000000000 );
        if ( shiftDist ) {
            sig128 = softfloat_shortShiftLeft128( sig64, sig0, -shiftDist );
            sig64 = sig128.v64;
            sig0  = sig128.v0;
        }
    } else {
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        if ( exp ) sig64 |= UINT64_C( 0x0001000000000000 );
        sigExtra = softfloat_shiftRightJam64Extra( sig64, sig0, shiftDist );
        sig64 = sigExtra.v;
        sig0  = sigExtra.extra;
    }
    return softfloat_roundToUI64( sign, sig64, sig0, roundingMode, exact );
 
}

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