f64_to_i64_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
int_fast64_t	f64_to_i64_r_minMag (float64_t a, bool exact)

Function Documentation

f64_to_i64_r_minMag()

int_fast64_t f64_to_i64_r_minMag	(	float64_t	a,
		bool	exact )

Definition at line 44 of file f64_to_i64_r_minMag.c.

{
    union ui64_f64 uA;
    uint_fast64_t uiA;
    bool sign;
    int_fast16_t exp;
    uint_fast64_t sig;
    int_fast16_t shiftDist;
    int_fast64_t absZ;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    sign = signF64UI( uiA );
    exp  = expF64UI( uiA );
    sig  = fracF64UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0x433 - exp;
    if ( shiftDist <= 0 ) {
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        if ( shiftDist < -10 ) {
            if ( uiA == packToF64UI( 1, 0x43E, 0 ) ) {
                return -INT64_C( 0x7FFFFFFFFFFFFFFF ) - 1;
            }
            softfloat_raiseFlags( softfloat_flag_invalid );
            return
                (exp == 0x7FF) && sig ? i64_fromNaN
                    : sign ? i64_fromNegOverflow : i64_fromPosOverflow;
        }
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        sig |= UINT64_C( 0x0010000000000000 );
        absZ = sig<<-shiftDist;
    } else {
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        if ( 53 <= shiftDist ) {
            if ( exact && (exp | sig) ) {
                softfloat_exceptionFlags |= softfloat_flag_inexact;
            }
            return 0;
        }
        /*--------------------------------------------------------------------
        *--------------------------------------------------------------------*/
        sig |= UINT64_C( 0x0010000000000000 );
        absZ = sig>>shiftDist;
        if ( exact && (absZ<<shiftDist != sig) ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
    }
    return sign ? -absZ : absZ;
 
}

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