WebSVN – HelenOS-historic – Diff – //uspace/trunk/softfloat/generic/conversion.c



#include "common.h"
 
float64 convertFloat32ToFloat64(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 );
   

}
 
float32 convertFloat64ToFloat32(float64 a)
{
    float32 result;
    int32_t exp;
    uint64_t frac;
   
    result.parts.sign = a.parts.sign;
   
    if (isFloat64NaN(a)) {
       
        result.parts.exp = 0xFF;
       
        if (isFloat64SigNaN(a)) {
            result.parts.fraction = 0x400000; /* set first bit of fraction nonzero */
            return result;
        }
   
        result.parts.fraction = 0x1; /* fraction nonzero but its first bit is zero */
        return result;

 
/** Helping procedure for converting float32 to uint32
 * @param a floating point number in normalized form (no NaNs or Inf are checked )
 * @return unsigned integer
 */
static uint32_t _float32_to_uint32_helper(float32 a)
{
    uint32_t frac;
   
    if (a.parts.exp < FLOAT32_BIAS) {
        /*TODO: rounding*/
        return 0;
    }

 
/* Convert float to unsigned int32
 * 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 (isFloat32NaN(a)) {
        return MAX_UINT32;
    }
   

 
/* Convert float to signed int32
 * 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 (isFloat32NaN(a)) {
        return MAX_INT32;
    }
   

 
/** Helping procedure for converting float64 to uint64
 * @param a floating point number in normalized form (no NaNs or Inf are checked )
 * @return unsigned integer
 */
static uint64_t _float64_to_uint64_helper(float64 a)
{
    uint64_t frac;
   
    if (a.parts.exp < FLOAT64_BIAS) {
        /*TODO: rounding*/
        return 0;
    }

 
/* Convert float to unsigned int64
 * 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 (isFloat64NaN(a)) {
        return MAX_UINT64;
    }
   

 
/* Convert float to signed int64
 * 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 (isFloat64NaN(a)) {
        return MAX_INT64;
    }
   

 
/** Helping procedure for converting float32 to uint64
 * @param a floating point number in normalized form (no NaNs or Inf are checked )
 * @return unsigned integer
 */
static uint64_t _float32_to_uint64_helper(float32 a)
{
    uint64_t frac;
   
    if (a.parts.exp < FLOAT32_BIAS) {
        /*TODO: rounding*/
        return 0;
    }

 
/* Convert float to unsigned int64
 * 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 (isFloat32NaN(a)) {
        return MAX_UINT64;
    }
   

 
/* Convert float to signed int64
 * 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 (isFloat32NaN(a)) {
        return MAX_INT64;
    }
   

 
/* Convert float64 to unsigned int32
 * 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 (isFloat64NaN(a)) {
        return MAX_UINT32;
    }
   

            return MIN_UINT32;
        }
        return MAX_UINT32;
    }
   
    return (uint32_t)_float64_to_uint64_helper(a); 
}
 
/* Convert float64 to signed int32
 * 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 (isFloat64NaN(a)) {
        return MAX_INT32;
    }
   

        if (a.parts.sign) {
            return MIN_INT32;
        }
        return MAX_INT32;
    }
    return (int32_t)_float64_to_uint64_helper(a);
}  
 
/** Convert unsigned integer to float32
 *
 *
 */
float32 uint32_to_float32(uint32_t i)
{
    int counter;
    int32_t exp;
    float32 result;
   
    result.parts.sign = 0;
    result.parts.fraction = 0;
 

    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;
    int32_t j;
    float32 result;
   
    result.parts.sign = 0;
    result.parts.fraction = 0;
 

    if (counter > 33) {
        i <<= counter - 1 - 32;
    } else {
        i >>= 1 + 32 - counter;
    }
   
    j = (uint32_t)i;
    roundFloat32(&exp, &j);
 
 
 
    result.parts.fraction = j >> 7;
    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;

 
/** Convert unsigned integer to float64
 *
 *
 */
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 = countZeroes32(i);

    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;
 

    result.parts.fraction = i >> 10;
    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;

Rev 876	Rev 1031
Line 32...	Line 32...
32	#include "common.h"	32	#include "common.h"
33		33
34	float64 convertFloat32ToFloat64(float32 a)	34	float64 convertFloat32ToFloat64(float32 a)
35	{	35	{
36	float64 result;	36	float64 result;
37	__u64 frac;	37	uint64_t frac;
38		38
39	result.parts.sign = a.parts.sign;	39	result.parts.sign = a.parts.sign;
40	result.parts.fraction = a.parts.fraction;	40	result.parts.fraction = a.parts.fraction;
41	result.parts.fraction <<= (FLOAT64_FRACTION_SIZE - FLOAT32_FRACTION_SIZE );	41	result.parts.fraction <<= (FLOAT64_FRACTION_SIZE - FLOAT32_FRACTION_SIZE );
42		42
Line 71...	Line 71...
71	}	71	}
72		72
73	float32 convertFloat64ToFloat32(float64 a)	73	float32 convertFloat64ToFloat32(float64 a)
74	{	74	{
75	float32 result;	75	float32 result;
76	__s32 exp;	76	int32_t exp;
77	__u64 frac;	77	uint64_t frac;
78		78
79	result.parts.sign = a.parts.sign;	79	result.parts.sign = a.parts.sign;
80		80
81	if (isFloat64NaN(a)) {	81	if (isFloat64NaN(a)) {
82		82
83	result.parts.exp = 0xFF;	83	result.parts.exp = 0xFF;
84		84
85	if (isFloat64SigNaN(a)) {	85	if (isFloat64SigNaN(a)) {
86	result.parts.fraction = 0x800000; /* set first bit of fraction nonzero */	86	result.parts.fraction = 0x400000; /* set first bit of fraction nonzero */
87	return result;	87	return result;
88	}	88	}
89		89
90	result.parts.fraction = 0x1; /* fraction nonzero but its first bit is zero */	90	result.parts.fraction = 0x1; /* fraction nonzero but its first bit is zero */
91	return result;	91	return result;
Line 142...	Line 142...
142		142
143	/** Helping procedure for converting float32 to uint32	143	/** Helping procedure for converting float32 to uint32
144	* @param a floating point number in normalized form (no NaNs or Inf are checked )	144	* @param a floating point number in normalized form (no NaNs or Inf are checked )
145	* @return unsigned integer	145	* @return unsigned integer
146	*/	146	*/
147	static __u32 _float32_to_uint32_helper(float32 a)	147	static uint32_t _float32_to_uint32_helper(float32 a)
148	{	148	{
149	__u32 frac;	149	uint32_t frac;
150		150
151	if (a.parts.exp < FLOAT32_BIAS) {	151	if (a.parts.exp < FLOAT32_BIAS) {
152	/TODO: rounding/	152	/TODO: rounding/
153	return 0;	153	return 0;
154	}	154	}
Line 170...	Line 170...
170		170
171	/* Convert float to unsigned int32	171	/* Convert float to unsigned int32
172	* FIXME: Im not sure what to return if overflow/underflow happens	172	* FIXME: Im not sure what to return if overflow/underflow happens
173	* - now its the biggest or the smallest int	173	* - now its the biggest or the smallest int
174	*/	174	*/
175	__u32 float32_to_uint32(float32 a)	175	uint32_t float32_to_uint32(float32 a)
176	{	176	{
177	if (isFloat32NaN(a)) {	177	if (isFloat32NaN(a)) {
178	return MAX_UINT32;	178	return MAX_UINT32;
179	}	179	}
180		180
Line 190...	Line 190...
190		190
191	/* Convert float to signed int32	191	/* Convert float to signed int32
192	* FIXME: Im not sure what to return if overflow/underflow happens	192	* FIXME: Im not sure what to return if overflow/underflow happens
193	* - now its the biggest or the smallest int	193	* - now its the biggest or the smallest int
194	*/	194	*/
195	__s32 float32_to_int32(float32 a)	195	int32_t float32_to_int32(float32 a)
196	{	196	{
197	if (isFloat32NaN(a)) {	197	if (isFloat32NaN(a)) {
198	return MAX_INT32;	198	return MAX_INT32;
199	}	199	}
200		200
Line 210...	Line 210...
210		210
211	/** Helping procedure for converting float64 to uint64	211	/** Helping procedure for converting float64 to uint64
212	* @param a floating point number in normalized form (no NaNs or Inf are checked )	212	* @param a floating point number in normalized form (no NaNs or Inf are checked )
213	* @return unsigned integer	213	* @return unsigned integer
214	*/	214	*/
215	static __u64 _float64_to_uint64_helper(float64 a)	215	static uint64_t _float64_to_uint64_helper(float64 a)
216	{	216	{
217	__u64 frac;	217	uint64_t frac;
218		218
219	if (a.parts.exp < FLOAT64_BIAS) {	219	if (a.parts.exp < FLOAT64_BIAS) {
220	/TODO: rounding/	220	/TODO: rounding/
221	return 0;	221	return 0;
222	}	222	}
Line 238...	Line 238...
238		238
239	/* Convert float to unsigned int64	239	/* Convert float to unsigned int64
240	* FIXME: Im not sure what to return if overflow/underflow happens	240	* FIXME: Im not sure what to return if overflow/underflow happens
241	* - now its the biggest or the smallest int	241	* - now its the biggest or the smallest int
242	*/	242	*/
243	__u64 float64_to_uint64(float64 a)	243	uint64_t float64_to_uint64(float64 a)
244	{	244	{
245	if (isFloat64NaN(a)) {	245	if (isFloat64NaN(a)) {
246	return MAX_UINT64;	246	return MAX_UINT64;
247	}	247	}
248		248
Line 258...	Line 258...
258		258
259	/* Convert float to signed int64	259	/* Convert float to signed int64
260	* FIXME: Im not sure what to return if overflow/underflow happens	260	* FIXME: Im not sure what to return if overflow/underflow happens
261	* - now its the biggest or the smallest int	261	* - now its the biggest or the smallest int
262	*/	262	*/
263	__s64 float64_to_int64(float64 a)	263	int64_t float64_to_int64(float64 a)
264	{	264	{
265	if (isFloat64NaN(a)) {	265	if (isFloat64NaN(a)) {
266	return MAX_INT64;	266	return MAX_INT64;
267	}	267	}
268		268
Line 281...	Line 281...
281		281
282	/** Helping procedure for converting float32 to uint64	282	/** Helping procedure for converting float32 to uint64
283	* @param a floating point number in normalized form (no NaNs or Inf are checked )	283	* @param a floating point number in normalized form (no NaNs or Inf are checked )
284	* @return unsigned integer	284	* @return unsigned integer
285	*/	285	*/
286	static __u64 _float32_to_uint64_helper(float32 a)	286	static uint64_t _float32_to_uint64_helper(float32 a)
287	{	287	{
288	__u64 frac;	288	uint64_t frac;
289		289
290	if (a.parts.exp < FLOAT32_BIAS) {	290	if (a.parts.exp < FLOAT32_BIAS) {
291	/TODO: rounding/	291	/TODO: rounding/
292	return 0;	292	return 0;
293	}	293	}
Line 309...	Line 309...
309		309
310	/* Convert float to unsigned int64	310	/* Convert float to unsigned int64
311	* FIXME: Im not sure what to return if overflow/underflow happens	311	* FIXME: Im not sure what to return if overflow/underflow happens
312	* - now its the biggest or the smallest int	312	* - now its the biggest or the smallest int
313	*/	313	*/
314	__u64 float32_to_uint64(float32 a)	314	uint64_t float32_to_uint64(float32 a)
315	{	315	{
316	if (isFloat32NaN(a)) {	316	if (isFloat32NaN(a)) {
317	return MAX_UINT64;	317	return MAX_UINT64;
318	}	318	}
319		319
Line 329...	Line 329...
329		329
330	/* Convert float to signed int64	330	/* Convert float to signed int64
331	* FIXME: Im not sure what to return if overflow/underflow happens	331	* FIXME: Im not sure what to return if overflow/underflow happens
332	* - now its the biggest or the smallest int	332	* - now its the biggest or the smallest int
333	*/	333	*/
334	__s64 float32_to_int64(float32 a)	334	int64_t float32_to_int64(float32 a)
335	{	335	{
336	if (isFloat32NaN(a)) {	336	if (isFloat32NaN(a)) {
337	return MAX_INT64;	337	return MAX_INT64;
338	}	338	}
339		339
Line 349...	Line 349...
349		349
350	/* Convert float64 to unsigned int32	350	/* Convert float64 to unsigned int32
351	* FIXME: Im not sure what to return if overflow/underflow happens	351	* FIXME: Im not sure what to return if overflow/underflow happens
352	* - now its the biggest or the smallest int	352	* - now its the biggest or the smallest int
353	*/	353	*/
354	__u32 float64_to_uint32(float64 a)	354	uint32_t float64_to_uint32(float64 a)
355	{	355	{
356	if (isFloat64NaN(a)) {	356	if (isFloat64NaN(a)) {
357	return MAX_UINT32;	357	return MAX_UINT32;
358	}	358	}
359		359
Line 362...	Line 362...
362	return MIN_UINT32;	362	return MIN_UINT32;
363	}	363	}
364	return MAX_UINT32;	364	return MAX_UINT32;
365	}	365	}
366		366
367	return (__u32)_float64_to_uint64_helper(a);	367	return (uint32_t)_float64_to_uint64_helper(a);
368	}	368	}
369		369
370	/* Convert float64 to signed int32	370	/* Convert float64 to signed int32
371	* FIXME: Im not sure what to return if overflow/underflow happens	371	* FIXME: Im not sure what to return if overflow/underflow happens
372	* - now its the biggest or the smallest int	372	* - now its the biggest or the smallest int
373	*/	373	*/
374	__s32 float64_to_int32(float64 a)	374	int32_t float64_to_int32(float64 a)
375	{	375	{
376	if (isFloat64NaN(a)) {	376	if (isFloat64NaN(a)) {
377	return MAX_INT32;	377	return MAX_INT32;
378	}	378	}
379		379
Line 381...	Line 381...
381	if (a.parts.sign) {	381	if (a.parts.sign) {
382	return MIN_INT32;	382	return MIN_INT32;
383	}	383	}
384	return MAX_INT32;	384	return MAX_INT32;
385	}	385	}
386	return (__s32)_float64_to_uint64_helper(a);	386	return (int32_t)_float64_to_uint64_helper(a);
387	}	387	}
388		388
389	/** Convert unsigned integer to float32	389	/** Convert unsigned integer to float32
390	*	390	*
391	*	391	*
392	*/	392	*/
393	float32 uint32_to_float32(__u32 i)	393	float32 uint32_to_float32(uint32_t i)
394	{	394	{
395	int counter;	395	int counter;
396	__s32 exp;	396	int32_t exp;
397	float32 result;	397	float32 result;
398		398
399	result.parts.sign = 0;	399	result.parts.sign = 0;
400	result.parts.fraction = 0;	400	result.parts.fraction = 0;
401		401
Line 420...	Line 420...
420	result.parts.exp = exp;	420	result.parts.exp = exp;
421		421
422	return result;	422	return result;
423	}	423	}
424		424
425	float32 int32_to_float32(__s32 i)	425	float32 int32_to_float32(int32_t i)
426	{	426	{
427	float32 result;	427	float32 result;
428		428
429	if (i < 0) {	429	if (i < 0) {
430	result = uint32_to_float32((__u32)(-i));	430	result = uint32_to_float32((uint32_t)(-i));
431	} else {	431	} else {
432	result = uint32_to_float32((__u32)i);	432	result = uint32_to_float32((uint32_t)i);
433	}	433	}
434		434
435	result.parts.sign = i < 0;	435	result.parts.sign = i < 0;
436		436
437	return result;	437	return result;
438	}	438	}
439		439
440		440
441	float32 uint64_to_float32(__u64 i)	441	float32 uint64_to_float32(uint64_t i)
442	{	442	{
443	int counter;	443	int counter;
444	__s32 exp;	444	int32_t exp;
-		445	int32_t j;
445	float32 result;	446	float32 result;
446		447
447	result.parts.sign = 0;	448	result.parts.sign = 0;
448	result.parts.fraction = 0;	449	result.parts.fraction = 0;
449		450
Line 460...	Line 461...
460	if (counter > 33) {	461	if (counter > 33) {
461	i <<= counter - 1 - 32;	462	i <<= counter - 1 - 32;
462	} else {	463	} else {
463	i >>= 1 + 32 - counter;	464	i >>= 1 + 32 - counter;
464	}	465	}
-		466
-		467	j = (uint32_t)i;
-		468	roundFloat32(&exp, &j);
465		469
466	roundFloat32(&exp, &i);	-
467		-
468	result.parts.fraction = i >> 7;	470	result.parts.fraction = j >> 7;
469	result.parts.exp = exp;	471	result.parts.exp = exp;
470	return result;	472	return result;
471	}	473	}
472		474
473	float32 int64_to_float32(__s64 i)	475	float32 int64_to_float32(int64_t i)
474	{	476	{
475	float32 result;	477	float32 result;
476		478
477	if (i < 0) {	479	if (i < 0) {
478	result = uint64_to_float32((__u64)(-i));	480	result = uint64_to_float32((uint64_t)(-i));
479	} else {	481	} else {
480	result = uint64_to_float32((__u64)i);	482	result = uint64_to_float32((uint64_t)i);
481	}	483	}
482		484
483	result.parts.sign = i < 0;	485	result.parts.sign = i < 0;
484		486
485	return result;	487	return result;
Line 487...	Line 489...
487		489
488	/** Convert unsigned integer to float64	490	/** Convert unsigned integer to float64
489	*	491	*
490	*	492	*
491	*/	493	*/
492	float64 uint32_to_float64(__u32 i)	494	float64 uint32_to_float64(uint32_t i)
493	{	495	{
494	int counter;	496	int counter;
495	__s32 exp;	497	int32_t exp;
496	float64 result;	498	float64 result;
497	__u64 frac;	499	uint64_t frac;
498		500
499	result.parts.sign = 0;	501	result.parts.sign = 0;
500	result.parts.fraction = 0;	502	result.parts.fraction = 0;
501		503
502	counter = countZeroes32(i);	504	counter = countZeroes32(i);
Line 517...	Line 519...
517	result.parts.exp = exp;	519	result.parts.exp = exp;
518		520
519	return result;	521	return result;
520	}	522	}
521		523
522	float64 int32_to_float64(__s32 i)	524	float64 int32_to_float64(int32_t i)
523	{	525	{
524	float64 result;	526	float64 result;
525		527
526	if (i < 0) {	528	if (i < 0) {
527	result = uint32_to_float64((__u32)(-i));	529	result = uint32_to_float64((uint32_t)(-i));
528	} else {	530	} else {
529	result = uint32_to_float64((__u32)i);	531	result = uint32_to_float64((uint32_t)i);
530	}	532	}
531		533
532	result.parts.sign = i < 0;	534	result.parts.sign = i < 0;
533		535
534	return result;	536	return result;
535	}	537	}
536		538
537		539
538	float64 uint64_to_float64(__u64 i)	540	float64 uint64_to_float64(uint64_t i)
539	{	541	{
540	int counter;	542	int counter;
541	__s32 exp;	543	int32_t exp;
542	float64 result;	544	float64 result;
543		545
544	result.parts.sign = 0;	546	result.parts.sign = 0;
545	result.parts.fraction = 0;	547	result.parts.fraction = 0;
546		548
Line 564...	Line 566...
564	result.parts.fraction = i >> 10;	566	result.parts.fraction = i >> 10;
565	result.parts.exp = exp;	567	result.parts.exp = exp;
566	return result;	568	return result;
567	}	569	}
568		570
569	float64 int64_to_float64(__s64 i)	571	float64 int64_to_float64(int64_t i)
570	{	572	{
571	float64 result;	573	float64 result;
572		574
573	if (i < 0) {	575	if (i < 0) {
574	result = uint64_to_float64((__u64)(-i));	576	result = uint64_to_float64((uint64_t)(-i));
575	} else {	577	} else {
576	result = uint64_to_float64((__u64)i);	578	result = uint64_to_float64((uint64_t)i);
577	}	579	}
578		580
579	result.parts.sign = i < 0;	581	result.parts.sign = i < 0;
580		582
581	return result;	583	return result;

Subversion Repositories HelenOS-historic

(root)//uspace/trunk/softfloat/generic/conversion.c – Rev 876 → 1031