f128_to_ui64_r_minMag.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_r_minMag (float128_t a, bool exact)

Function Documentation

f128_to_ui64_r_minMag()

uint_fast64_t f128_to_ui64_r_minMag	(	float128_t	a,
		bool	exact )

Definition at line 44 of file f128_to_ui64_r_minMag.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;
    int_fast8_t negShiftDist;
    uint_fast64_t z;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    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 ( sign || (shiftDist < -15) ) goto invalid;
        sig64 |= UINT64_C( 0x0001000000000000 );
        negShiftDist = -shiftDist;
        z = sig64<<negShiftDist | sig0>>(shiftDist & 63);
        if ( exact && (uint64_t) (sig0<<negShiftDist) ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
    } else {
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        if ( 49 <= shiftDist ) {
            if ( exact && (exp | sig64 | sig0) ) {
                softfloat_exceptionFlags |= softfloat_flag_inexact;
            }
            return 0;
        }
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        if ( sign ) goto invalid;
        sig64 |= UINT64_C( 0x0001000000000000 );
        z = sig64>>shiftDist;
        if ( exact && (sig0 || (z<<shiftDist != sig64)) ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
    }
    return z;
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
 invalid:
    softfloat_raiseFlags( softfloat_flag_invalid );
    return
        (exp == 0x7FFF) && (sig64 | sig0) ? ui64_fromNaN
            : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
 
}

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