extF80_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	extF80_to_ui64 (extFloat80_t a, uint_fast8_t roundingMode, bool exact)

Function Documentation

extF80_to_ui64()

uint_fast64_t extF80_to_ui64	(	extFloat80_t	a,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 45 of file extF80_to_ui64.c.

{
    union { struct extFloat80M s; extFloat80_t f; } uA;
    uint_fast16_t uiA64;
    bool sign;
    int_fast32_t exp;
    uint_fast64_t sig;
    int_fast32_t shiftDist;
    uint_fast64_t sigExtra;
    struct uint64_extra sig64Extra;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA64 = uA.s.signExp;
    sign = signExtF80UI64( uiA64 );
    exp  = expExtF80UI64( uiA64 );
    sig = uA.s.signif;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0x403E - exp;
    if ( shiftDist < 0 ) {
        softfloat_raiseFlags( softfloat_flag_invalid );
        return
            (exp == 0x7FFF) && (sig & UINT64_C( 0x7FFFFFFFFFFFFFFF ))
                ? ui64_fromNaN
                : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sigExtra = 0;
    if ( shiftDist ) {
        sig64Extra = softfloat_shiftRightJam64Extra( sig, 0, shiftDist );
        sig = sig64Extra.v;
        sigExtra = sig64Extra.extra;
    }
    return softfloat_roundToUI64( sign, sig, sigExtra, roundingMode, exact );
 
}

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