f32_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	f32_to_ui64 (float32_t a, uint_fast8_t roundingMode, bool exact)

Function Documentation

f32_to_ui64()

uint_fast64_t f32_to_ui64	(	float32_t	a,
		uint_fast8_t	roundingMode,
		bool	exact )

Definition at line 44 of file f32_to_ui64.c.

{
    union ui32_f32 uA;
    uint_fast32_t uiA;
    bool sign;
    int_fast16_t exp;
    uint_fast32_t sig;
    int_fast16_t shiftDist;
#ifdef SOFTFLOAT_FAST_INT64
    uint_fast64_t sig64, extra;
    struct uint64_extra sig64Extra;
#else
    uint32_t extSig[3];
#endif
 
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    uA.f = a;
    uiA = uA.ui;
    sign = signF32UI( uiA );
    exp  = expF32UI( uiA );
    sig  = fracF32UI( uiA );
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    shiftDist = 0xBE - exp;
    if ( shiftDist < 0 ) {
        softfloat_raiseFlags( softfloat_flag_invalid );
        return
            (exp == 0xFF) && sig ? ui64_fromNaN
                : sign ? ui64_fromNegOverflow : ui64_fromPosOverflow;
    }
    /*------------------------------------------------------------------------
    *------------------------------------------------------------------------*/
    if ( exp ) sig |= 0x00800000;
#ifdef SOFTFLOAT_FAST_INT64
    sig64 = (uint_fast64_t) sig<<40;
    extra = 0;
    if ( shiftDist ) {
        sig64Extra = softfloat_shiftRightJam64Extra( sig64, 0, shiftDist );
        sig64 = sig64Extra.v;
        extra = sig64Extra.extra;
    }
    return softfloat_roundToUI64( sign, sig64, extra, roundingMode, exact );
#else
    extSig[indexWord( 3, 2 )] = sig<<8;
    extSig[indexWord( 3, 1 )] = 0;
    extSig[indexWord( 3, 0 )] = 0;
    if ( shiftDist ) softfloat_shiftRightJam96M( extSig, shiftDist, extSig );
    return softfloat_roundMToUI64( sign, extSig, roundingMode, exact );
#endif
 
}

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