source: mainline/uspace/lib/softfloat/generic/conversion.c@ 88d5c1e

/*
 * Copyright (c) 2005 Josef Cejka
 * Copyright (c) 2011 Petr Koupy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup softfloat
 * @{
 */
/** @file Conversion of precision and conversion between integers and floats.
 */

#include <sftypes.h>
#include <conversion.h>
#include <comparison.h>
#include <common.h>

float64 float32_to_float64(float32 a)
{
        float64 result;
        uint64_t frac;
        
        result.parts.sign = a.parts.sign;
        result.parts.fraction = a.parts.fraction;
        result.parts.fraction <<= (FLOAT64_FRACTION_SIZE - FLOAT32_FRACTION_SIZE);
        
        if ((is_float32_infinity(a)) || (is_float32_nan(a))) {
                result.parts.exp = FLOAT64_MAX_EXPONENT;
                // TODO; check if its correct for SigNaNs
                return result;
        }
        
        result.parts.exp = a.parts.exp + ((int) FLOAT64_BIAS - FLOAT32_BIAS);
        if (a.parts.exp == 0) {
                /* normalize denormalized numbers */
                
                if (result.parts.fraction == 0) { /* fix zero */
                        result.parts.exp = 0;
                        return result;
                }
                        
                frac = result.parts.fraction;
                
                while (!(frac & FLOAT64_HIDDEN_BIT_MASK)) {
                        frac <<= 1;
                        --result.parts.exp;
                }
                
                ++result.parts.exp;
                result.parts.fraction = frac;
        }
        
        return result;
}

float128 float32_to_float128(float32 a)
{
        float128 result;
        uint64_t frac_hi, frac_lo;
        uint64_t tmp_hi, tmp_lo;
        
        result.parts.sign = a.parts.sign;
        result.parts.frac_hi = 0;
        result.parts.frac_lo = a.parts.fraction;
        lshift128(result.parts.frac_hi, result.parts.frac_lo,
            (FLOAT128_FRACTION_SIZE - FLOAT32_FRACTION_SIZE),
            &frac_hi, &frac_lo);
        result.parts.frac_hi = frac_hi;
        result.parts.frac_lo = frac_lo;
        
        if ((is_float32_infinity(a)) || (is_float32_nan(a))) {
                result.parts.exp = FLOAT128_MAX_EXPONENT;
                // TODO; check if its correct for SigNaNs
                return result;
        }
        
        result.parts.exp = a.parts.exp + ((int) FLOAT128_BIAS - FLOAT32_BIAS);
        if (a.parts.exp == 0) {
                /* normalize denormalized numbers */
                
                if (eq128(result.parts.frac_hi,
                    result.parts.frac_lo, 0x0ll, 0x0ll)) { /* fix zero */
                        result.parts.exp = 0;
                        return result;
                }
                
                frac_hi = result.parts.frac_hi;
                frac_lo = result.parts.frac_lo;
                
                and128(frac_hi, frac_lo,
                    FLOAT128_HIDDEN_BIT_MASK_HI, FLOAT128_HIDDEN_BIT_MASK_LO,
                    &tmp_hi, &tmp_lo);
                while (!lt128(0x0ll, 0x0ll, tmp_hi, tmp_lo)) {
                        lshift128(frac_hi, frac_lo, 1, &frac_hi, &frac_lo);
                        --result.parts.exp;
                }
                
                ++result.parts.exp;
                result.parts.frac_hi = frac_hi;
                result.parts.frac_lo = frac_lo;
        }
        
        return result;
}

float128 float64_to_float128(float64 a)
{
        float128 result;
        uint64_t frac_hi, frac_lo;
        uint64_t tmp_hi, tmp_lo;
        
        result.parts.sign = a.parts.sign;
        result.parts.frac_hi = 0;
        result.parts.frac_lo = a.parts.fraction;
        lshift128(result.parts.frac_hi, result.parts.frac_lo,
            (FLOAT128_FRACTION_SIZE - FLOAT64_FRACTION_SIZE),
            &frac_hi, &frac_lo);
        result.parts.frac_hi = frac_hi;
        result.parts.frac_lo = frac_lo;
        
        if ((is_float64_infinity(a)) || (is_float64_nan(a))) {
                result.parts.exp = FLOAT128_MAX_EXPONENT;
                // TODO; check if its correct for SigNaNs
                return result;
        }
        
        result.parts.exp = a.parts.exp + ((int) FLOAT128_BIAS - FLOAT64_BIAS);
        if (a.parts.exp == 0) {
                /* normalize denormalized numbers */
                
                if (eq128(result.parts.frac_hi,
                    result.parts.frac_lo, 0x0ll, 0x0ll)) { /* fix zero */
                        result.parts.exp = 0;
                        return result;
                }
                
                frac_hi = result.parts.frac_hi;
                frac_lo = result.parts.frac_lo;
                
                and128(frac_hi, frac_lo,
                    FLOAT128_HIDDEN_BIT_MASK_HI, FLOAT128_HIDDEN_BIT_MASK_LO,
                    &tmp_hi, &tmp_lo);
                while (!lt128(0x0ll, 0x0ll, tmp_hi, tmp_lo)) {
                        lshift128(frac_hi, frac_lo, 1, &frac_hi, &frac_lo);
                        --result.parts.exp;
                }
                
                ++result.parts.exp;
                result.parts.frac_hi = frac_hi;
                result.parts.frac_lo = frac_lo;
        }
        
        return result;
}

float32 float64_to_float32(float64 a)
{
        float32 result;
        int32_t exp;
        uint64_t frac;
        
        result.parts.sign = a.parts.sign;
        
        if (is_float64_nan(a)) {
                result.parts.exp = FLOAT32_MAX_EXPONENT;
                
                if (is_float64_signan(a)) {
                        /* set first bit of fraction nonzero */
                        result.parts.fraction = FLOAT32_HIDDEN_BIT_MASK >> 1;
                        return result;
                }
                
                /* fraction nonzero but its first bit is zero */
                result.parts.fraction = 0x1;
                return result;
        }
        
        if (is_float64_infinity(a)) {
                result.parts.fraction = 0;
                result.parts.exp = FLOAT32_MAX_EXPONENT;
                return result;
        }
        
        exp = (int) a.parts.exp - FLOAT64_BIAS + FLOAT32_BIAS;
        
        if (exp >= FLOAT32_MAX_EXPONENT) {
                /* FIXME: overflow */
                result.parts.fraction = 0;
                result.parts.exp = FLOAT32_MAX_EXPONENT;
                return result;
        } else if (exp <= 0) {
                /* underflow or denormalized */
                
                result.parts.exp = 0;
                
                exp *= -1;      
                if (exp > FLOAT32_FRACTION_SIZE) {
                        /* FIXME: underflow */
                        result.parts.fraction = 0;
                        return result;
                }
                
                /* denormalized */
                
                frac = a.parts.fraction; 
                frac |= FLOAT64_HIDDEN_BIT_MASK; /* denormalize and set hidden bit */
                
                frac >>= (FLOAT64_FRACTION_SIZE - FLOAT32_FRACTION_SIZE + 1);
                
                while (exp > 0) {
                        --exp;
                        frac >>= 1;
                }
                result.parts.fraction = frac;
                
                return result;
        }
        
        result.parts.exp = exp;
        result.parts.fraction =
            a.parts.fraction >> (FLOAT64_FRACTION_SIZE - FLOAT32_FRACTION_SIZE);
        return result;
}

float32 float128_to_float32(float128 a)
{
        float32 result;
        int32_t exp;
        uint64_t frac_hi, frac_lo;
        
        result.parts.sign = a.parts.sign;
        
        if (is_float128_nan(a)) {
                result.parts.exp = FLOAT32_MAX_EXPONENT;
                
                if (is_float128_signan(a)) {
                        /* set first bit of fraction nonzero */
                        result.parts.fraction = FLOAT32_HIDDEN_BIT_MASK >> 1;
                        return result;
                }
                
                /* fraction nonzero but its first bit is zero */
                result.parts.fraction = 0x1;
                return result;
        }
        
        if (is_float128_infinity(a)) {
                result.parts.fraction = 0;
                result.parts.exp = FLOAT32_MAX_EXPONENT;
                return result;
        }
        
        exp = (int) a.parts.exp - FLOAT128_BIAS + FLOAT32_BIAS;
        
        if (exp >= FLOAT32_MAX_EXPONENT) {
                /* FIXME: overflow */
                result.parts.fraction = 0;
                result.parts.exp = FLOAT32_MAX_EXPONENT;
                return result;
        } else if (exp <= 0) {
                /* underflow or denormalized */
                
                result.parts.exp = 0;
                
                exp *= -1;
                if (exp > FLOAT32_FRACTION_SIZE) {
                        /* FIXME: underflow */
                        result.parts.fraction = 0;
                        return result;
                }
                
                /* denormalized */
                
                frac_hi = a.parts.frac_hi;
                frac_lo = a.parts.frac_lo;
                
                /* denormalize and set hidden bit */
                frac_hi |= FLOAT128_HIDDEN_BIT_MASK_HI;
                
                rshift128(frac_hi, frac_lo,
                    (FLOAT128_FRACTION_SIZE - FLOAT32_FRACTION_SIZE + 1),
                    &frac_hi, &frac_lo);
                
                while (exp > 0) {
                        --exp;
                        rshift128(frac_hi, frac_lo, 1, &frac_hi, &frac_lo);
                }
                result.parts.fraction = frac_lo;
                
                return result;
        }
        
        result.parts.exp = exp;
        frac_hi = a.parts.frac_hi;
        frac_lo = a.parts.frac_lo;
        rshift128(frac_hi, frac_lo,
            (FLOAT128_FRACTION_SIZE - FLOAT32_FRACTION_SIZE + 1),
            &frac_hi, &frac_lo);
        result.parts.fraction = frac_lo;
        return result;
}

float64 float128_to_float64(float128 a)
{
        float64 result;
        int32_t exp;
        uint64_t frac_hi, frac_lo;
        
        result.parts.sign = a.parts.sign;
        
        if (is_float128_nan(a)) {
                result.parts.exp = FLOAT64_MAX_EXPONENT;
                
                if (is_float128_signan(a)) {
                        /* set first bit of fraction nonzero */
                        result.parts.fraction = FLOAT64_HIDDEN_BIT_MASK >> 1;
                        return result;
                }
                
                /* fraction nonzero but its first bit is zero */
                result.parts.fraction = 0x1;
                return result;
        }
        
        if (is_float128_infinity(a)) {
                result.parts.fraction = 0;
                result.parts.exp = FLOAT64_MAX_EXPONENT;
                return result;
        }
        
        exp = (int) a.parts.exp - FLOAT128_BIAS + FLOAT64_BIAS;
        
        if (exp >= FLOAT64_MAX_EXPONENT) {
                /* FIXME: overflow */
                result.parts.fraction = 0;
                result.parts.exp = FLOAT64_MAX_EXPONENT;
                return result;
        } else if (exp <= 0) {
                /* underflow or denormalized */
                
                result.parts.exp = 0;
                
                exp *= -1;
                if (exp > FLOAT64_FRACTION_SIZE) {
                        /* FIXME: underflow */
                        result.parts.fraction = 0;
                        return result;
                }
                
                /* denormalized */
                
                frac_hi = a.parts.frac_hi;
                frac_lo = a.parts.frac_lo;
                
                /* denormalize and set hidden bit */
                frac_hi |= FLOAT128_HIDDEN_BIT_MASK_HI;
                
                rshift128(frac_hi, frac_lo,
                    (FLOAT128_FRACTION_SIZE - FLOAT64_FRACTION_SIZE + 1),
                    &frac_hi, &frac_lo);
                
                while (exp > 0) {
                        --exp;
                        rshift128(frac_hi, frac_lo, 1, &frac_hi, &frac_lo);
                }
                result.parts.fraction = frac_lo;
                
                return result;
        }
        
        result.parts.exp = exp;
        frac_hi = a.parts.frac_hi;
        frac_lo = a.parts.frac_lo;
        rshift128(frac_hi, frac_lo,
            (FLOAT128_FRACTION_SIZE - FLOAT64_FRACTION_SIZE + 1),
            &frac_hi, &frac_lo);
        result.parts.fraction = frac_lo;
        return result;
}

/** Helper procedure for converting float32 to uint32.
 *
 * @param a Floating point number in normalized form
 *     (NaNs or Inf are not checked).
 * @return Converted unsigned integer.
 */
static uint32_t _float32_to_uint32_helper(float32 a)
{
        uint32_t frac;
        
        if (a.parts.exp < FLOAT32_BIAS) {
                /* TODO: rounding */
                return 0;
        }
        
        frac = a.parts.fraction;
        
        frac |= FLOAT32_HIDDEN_BIT_MASK;
        /* shift fraction to left so hidden bit will be the most significant bit */
        frac <<= 32 - FLOAT32_FRACTION_SIZE - 1; 
        
        frac >>= 32 - (a.parts.exp - FLOAT32_BIAS) - 1;
        if ((a.parts.sign == 1) && (frac != 0)) {
                frac = ~frac;
                ++frac;
        }
        
        return frac;
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
uint32_t float32_to_uint32(float32 a)
{
        if (is_float32_nan(a))
                return UINT32_MAX;
        
        if (is_float32_infinity(a) || (a.parts.exp >= (32 + FLOAT32_BIAS))) {
                if (a.parts.sign)
                        return UINT32_MIN;
                
                return UINT32_MAX;
        }
        
        return _float32_to_uint32_helper(a);
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
int32_t float32_to_int32(float32 a)
{
        if (is_float32_nan(a))
                return INT32_MAX;
        
        if (is_float32_infinity(a) || (a.parts.exp >= (32 + FLOAT32_BIAS))) {
                if (a.parts.sign)
                        return INT32_MIN;
                
                return INT32_MAX;
        }
        
        return _float32_to_uint32_helper(a);
}

/** Helper procedure for converting float32 to uint64.
 *
 * @param a Floating point number in normalized form
 *     (NaNs or Inf are not checked).
 * @return Converted unsigned integer.
 */
static uint64_t _float32_to_uint64_helper(float32 a)
{
        uint64_t frac;
        
        if (a.parts.exp < FLOAT32_BIAS) {
                // TODO: rounding
                return 0;
        }
        
        frac = a.parts.fraction;
        
        frac |= FLOAT32_HIDDEN_BIT_MASK;
        /* shift fraction to left so hidden bit will be the most significant bit */
        frac <<= 64 - FLOAT32_FRACTION_SIZE - 1;
        
        frac >>= 64 - (a.parts.exp - FLOAT32_BIAS) - 1;
        if ((a.parts.sign == 1) && (frac != 0)) {
                frac = ~frac;
                ++frac;
        }
        
        return frac;
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
uint64_t float32_to_uint64(float32 a)
{
        if (is_float32_nan(a))
                return UINT64_MAX;
        
        if (is_float32_infinity(a) || (a.parts.exp >= (64 + FLOAT32_BIAS))) {
                if (a.parts.sign)
                        return UINT64_MIN;
                
                return UINT64_MAX;
        }
        
        return _float32_to_uint64_helper(a);
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
int64_t float32_to_int64(float32 a)
{
        if (is_float32_nan(a))
                return INT64_MAX;
        
        if (is_float32_infinity(a) || (a.parts.exp >= (64 + FLOAT32_BIAS))) {
                if (a.parts.sign)
                        return INT64_MIN;
                
                return INT64_MAX;
        }
        
        return _float32_to_uint64_helper(a);
}

/** Helper procedure for converting float64 to uint64.
 *
 * @param a Floating point number in normalized form
 *     (NaNs or Inf are not checked).
 * @return Converted unsigned integer.
 */
static uint64_t _float64_to_uint64_helper(float64 a)
{
        uint64_t frac;
        
        if (a.parts.exp < FLOAT64_BIAS) {
                // TODO: rounding
                return 0;
        }
        
        frac = a.parts.fraction;
        
        frac |= FLOAT64_HIDDEN_BIT_MASK;
        /* shift fraction to left so hidden bit will be the most significant bit */
        frac <<= 64 - FLOAT64_FRACTION_SIZE - 1;
        
        frac >>= 64 - (a.parts.exp - FLOAT64_BIAS) - 1;
        if ((a.parts.sign == 1) && (frac != 0)) {
                frac = ~frac;
                ++frac;
        }
        
        return frac;
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
uint32_t float64_to_uint32(float64 a)
{
        if (is_float64_nan(a))
                return UINT32_MAX;
        
        if (is_float64_infinity(a) || (a.parts.exp >= (32 + FLOAT64_BIAS))) {
                if (a.parts.sign)
                        return UINT32_MIN;
                
                return UINT32_MAX;
        }
        
        return (uint32_t) _float64_to_uint64_helper(a);
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
int32_t float64_to_int32(float64 a)
{
        if (is_float64_nan(a))
                return INT32_MAX;
        
        if (is_float64_infinity(a) || (a.parts.exp >= (32 + FLOAT64_BIAS))) {
                if (a.parts.sign)
                        return INT32_MIN;
                
                return INT32_MAX;
        }
        
        return (int32_t) _float64_to_uint64_helper(a);
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens 
 *  - now its the biggest or the smallest int
 */
uint64_t float64_to_uint64(float64 a)
{
        if (is_float64_nan(a))
                return UINT64_MAX;
        
        if (is_float64_infinity(a) || (a.parts.exp >= (64 + FLOAT64_BIAS))) {
                if (a.parts.sign)
                        return UINT64_MIN;
                
                return UINT64_MAX;
        }
        
        return _float64_to_uint64_helper(a);
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens 
 *  - now its the biggest or the smallest int
 */
int64_t float64_to_int64(float64 a)
{
        if (is_float64_nan(a))
                return INT64_MAX;
        
        if (is_float64_infinity(a) || (a.parts.exp >= (64 + FLOAT64_BIAS))) {
                if (a.parts.sign)
                        return INT64_MIN;
                
                return INT64_MAX;
        }
        
        return _float64_to_uint64_helper(a);
}

/** Helper procedure for converting float128 to uint64.
 *
 * @param a Floating point number in normalized form
 *     (NaNs or Inf are not checked).
 * @return Converted unsigned integer.
 */
static uint64_t _float128_to_uint64_helper(float128 a)
{
        uint64_t frac_hi, frac_lo;
        
        if (a.parts.exp < FLOAT128_BIAS) {
                // TODO: rounding
                return 0;
        }
        
        frac_hi = a.parts.frac_hi;
        frac_lo = a.parts.frac_lo;
        
        frac_hi |= FLOAT128_HIDDEN_BIT_MASK_HI;
        /* shift fraction to left so hidden bit will be the most significant bit */
        lshift128(frac_hi, frac_lo,
            (128 - FLOAT128_FRACTION_SIZE - 1), &frac_hi, &frac_lo);
        
        rshift128(frac_hi, frac_lo,
            (128 - (a.parts.exp - FLOAT128_BIAS) - 1), &frac_hi, &frac_lo);
        if ((a.parts.sign == 1) && !eq128(frac_hi, frac_lo, 0x0ll, 0x0ll)) {
                not128(frac_hi, frac_lo, &frac_hi, &frac_lo);
                add128(frac_hi, frac_lo, 0x0ll, 0x1ll, &frac_hi, &frac_lo);
        }
        
        return frac_lo;
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
uint32_t float128_to_uint32(float128 a)
{
        if (is_float128_nan(a))
                return UINT32_MAX;
        
        if (is_float128_infinity(a) || (a.parts.exp >= (32 + FLOAT128_BIAS))) {
                if (a.parts.sign)
                        return UINT32_MIN;
                
                return UINT32_MAX;
        }
        
        return (uint32_t) _float128_to_uint64_helper(a);
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
int32_t float128_to_int32(float128 a)
{
        if (is_float128_nan(a))
                return INT32_MAX;
        
        if (is_float128_infinity(a) || (a.parts.exp >= (32 + FLOAT128_BIAS))) {
                if (a.parts.sign)
                        return INT32_MIN;
                
                return INT32_MAX;
        }
        
        return (int32_t) _float128_to_uint64_helper(a);
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
uint64_t float128_to_uint64(float128 a)
{
        if (is_float128_nan(a))
                return UINT64_MAX;
        
        if (is_float128_infinity(a) || (a.parts.exp >= (64 + FLOAT128_BIAS))) {
                if (a.parts.sign)
                        return UINT64_MIN;
                
                return UINT64_MAX;
        }
        
        return _float128_to_uint64_helper(a);
}

/*
 * FIXME: Im not sure what to return if overflow/underflow happens
 *  - now its the biggest or the smallest int
 */
int64_t float128_to_int64(float128 a)
{
        if (is_float128_nan(a))
                return INT64_MAX;
        
        if (is_float128_infinity(a) || (a.parts.exp >= (64 + FLOAT128_BIAS))) {
                if (a.parts.sign)
                        return INT64_MIN;
                
                return INT64_MAX;
        }
        
        return _float128_to_uint64_helper(a);
}

float32 uint32_to_float32(uint32_t i)
{
        int counter;
        int32_t exp;
        float32 result;
        
        result.parts.sign = 0;
        result.parts.fraction = 0;
        
        counter = count_zeroes32(i);
        
        exp = FLOAT32_BIAS + 32 - counter - 1;
        
        if (counter == 32) {
                result.bin = 0;
                return result;
        }
        
        if (counter > 0) {
                i <<= counter - 1;
        } else {
                i >>= 1;
        }
        
        round_float32(&exp, &i);
        
        result.parts.fraction = i >> (32 - FLOAT32_FRACTION_SIZE - 2);
        result.parts.exp = exp;
        
        return result;
}

float32 int32_to_float32(int32_t i)
{
        float32 result;
        
        if (i < 0)
                result = uint32_to_float32((uint32_t) (-i));
        else
                result = uint32_to_float32((uint32_t) i);
        
        result.parts.sign = i < 0;
        
        return result;
}

float32 uint64_to_float32(uint64_t i)
{
        int counter;
        int32_t exp;
        uint32_t j;
        float32 result;
        
        result.parts.sign = 0;
        result.parts.fraction = 0;
        
        counter = count_zeroes64(i);
        
        exp = FLOAT32_BIAS + 64 - counter - 1;
        
        if (counter == 64) {
                result.bin = 0;
                return result;
        }
        
        /* Shift all to the first 31 bits (31st will be hidden 1) */
        if (counter > 33) {
                i <<= counter - 1 - 32;
        } else {
                i >>= 1 + 32 - counter;
        }
        
        j = (uint32_t) i;
        round_float32(&exp, &j);
        
        result.parts.fraction = j >> (32 - FLOAT32_FRACTION_SIZE - 2);
        result.parts.exp = exp;
        return result;
}

float32 int64_to_float32(int64_t i)
{
        float32 result;
        
        if (i < 0)
                result = uint64_to_float32((uint64_t) (-i));
        else
                result = uint64_to_float32((uint64_t) i);
        
        result.parts.sign = i < 0;
        
        return result;
}

float64 uint32_to_float64(uint32_t i)
{
        int counter;
        int32_t exp;
        float64 result;
        uint64_t frac;
        
        result.parts.sign = 0;
        result.parts.fraction = 0;
        
        counter = count_zeroes32(i);
        
        exp = FLOAT64_BIAS + 32 - counter - 1;
        
        if (counter == 32) {
                result.bin = 0;
                return result;
        }
        
        frac = i;
        frac <<= counter + 32 - 1;
        
        round_float64(&exp, &frac);
        
        result.parts.fraction = frac >> (64 - FLOAT64_FRACTION_SIZE - 2);
        result.parts.exp = exp;
        
        return result;
}

float64 int32_to_float64(int32_t i)
{
        float64 result;
        
        if (i < 0)
                result = uint32_to_float64((uint32_t) (-i));
        else
                result = uint32_to_float64((uint32_t) i);
        
        result.parts.sign = i < 0;
        
        return result;
}


float64 uint64_to_float64(uint64_t i)
{
        int counter;
        int32_t exp;
        float64 result;
        
        result.parts.sign = 0;
        result.parts.fraction = 0;
        
        counter = count_zeroes64(i);
        
        exp = FLOAT64_BIAS + 64 - counter - 1;
        
        if (counter == 64) {
                result.bin = 0;
                return result;
        }
        
        if (counter > 0) {
                i <<= counter - 1;
        } else {
                i >>= 1;
        }
        
        round_float64(&exp, &i);
        
        result.parts.fraction = i >> (64 - FLOAT64_FRACTION_SIZE - 2);
        result.parts.exp = exp;
        return result;
}

float64 int64_to_float64(int64_t i)
{
        float64 result;
        
        if (i < 0)
                result = uint64_to_float64((uint64_t) (-i));
        else
                result = uint64_to_float64((uint64_t) i);
        
        result.parts.sign = i < 0;
        
        return result;
}

float128 uint32_to_float128(uint32_t i)
{
        int counter;
        int32_t exp;
        float128 result;
        uint64_t frac_hi, frac_lo;
        
        result.parts.sign = 0;
        result.parts.frac_hi = 0;
        result.parts.frac_lo = 0;
        
        counter = count_zeroes32(i);
        
        exp = FLOAT128_BIAS + 32 - counter - 1;
        
        if (counter == 32) {
                result.bin.hi = 0;
                result.bin.lo = 0;
                return result;
        }
        
        frac_hi = 0;
        frac_lo = i;
        lshift128(frac_hi, frac_lo, (counter + 96 - 1), &frac_hi, &frac_lo);
        
        round_float128(&exp, &frac_hi, &frac_lo);
        
        rshift128(frac_hi, frac_lo,
            (128 - FLOAT128_FRACTION_SIZE - 2), &frac_hi, &frac_lo);
        result.parts.frac_hi = frac_hi;
        result.parts.frac_lo = frac_lo;
        result.parts.exp = exp;
        
        return result;
}

float128 int32_to_float128(int32_t i)
{
        float128 result;
        
        if (i < 0)
                result = uint32_to_float128((uint32_t) (-i));
        else
                result = uint32_to_float128((uint32_t) i);
        
        result.parts.sign = i < 0;
        
        return result;
}


float128 uint64_to_float128(uint64_t i)
{
        int counter;
        int32_t exp;
        float128 result;
        uint64_t frac_hi, frac_lo;
        
        result.parts.sign = 0;
        result.parts.frac_hi = 0;
        result.parts.frac_lo = 0;
        
        counter = count_zeroes64(i);
        
        exp = FLOAT128_BIAS + 64 - counter - 1;
        
        if (counter == 64) {
                result.bin.hi = 0;
                result.bin.lo = 0;
                return result;
        }
        
        frac_hi = 0;
        frac_lo = i;
        lshift128(frac_hi, frac_lo, (counter + 64 - 1), &frac_hi, &frac_lo);
        
        round_float128(&exp, &frac_hi, &frac_lo);
        
        rshift128(frac_hi, frac_lo,
            (128 - FLOAT128_FRACTION_SIZE - 2), &frac_hi, &frac_lo);
        result.parts.frac_hi = frac_hi;
        result.parts.frac_lo = frac_lo;
        result.parts.exp = exp;
        
        return result;
}

float128 int64_to_float128(int64_t i)
{
        float128 result;
        
        if (i < 0)
                result = uint64_to_float128((uint64_t) (-i));
        else
                result = uint64_to_float128((uint64_t) i);
        
        result.parts.sign = i < 0;
        
        return result;
}

/** @}
 */