f32_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	f32_to_ui64_r_minMag (float32_t a, bool exact)

Function Documentation

f32_to_ui64_r_minMag()

uint_fast64_t f32_to_ui64_r_minMag	(	float32_t	a,
		bool	exact )

Definition at line 44 of file f32_to_ui64_r_minMag.c.

{
    union ui32_f32 uA;
    uint_fast32_t uiA;
    int_fast16_t exp;
    uint_fast32_t sig;
    int_fast16_t shiftDist;
    bool sign;
    uint_fast64_t sig64, z;
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    exp = expF32UI( uiA );
    sig = fracF32UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0xBE - exp;
    if ( 64 <= shiftDist ) {
        if ( exact && (exp | sig) ) {
            softfloat_exceptionFlags |= softfloat_flag_inexact;
        }
        return 0;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sign = signF32UI( uiA );
    if ( sign || (shiftDist < 0) ) {
        softfloat_raiseFlags( softfloat_flag_invalid );
        return
            (exp == 0xFF) && sig ? ui64_fromNaN
                : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    sig |= 0x00800000;
    sig64 = (uint_fast64_t) sig<<40;
    z = sig64>>shiftDist;
    shiftDist = 40 - shiftDist;
    if ( exact && (shiftDist < 0) && (uint32_t) (sig<<(shiftDist & 31)) ) {
        softfloat_exceptionFlags |= softfloat_flag_inexact;
    }
    return z;
 
}

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