91 lines
1.9 KiB
C
91 lines
1.9 KiB
C
/* _ufix64toa_r: convert unsigned 64-bit fixed point to ASCII string.
|
|
*
|
|
* This routine converts an unsigned fixed-point number to long double format and
|
|
* then calls _ldtoa_r to do the conversion.
|
|
*
|
|
* Written by Jeff Johnston.
|
|
*/
|
|
|
|
#ifdef __SPE__
|
|
|
|
#include <_ansi.h>
|
|
#include <limits.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <reent.h>
|
|
#include "fix64.h"
|
|
|
|
extern char *_simdldtoa_r (struct _reent *, LONG_DOUBLE_UNION *, int,
|
|
int, int *, int *, char **);
|
|
|
|
/*
|
|
* Convert an unsigned fixed-point 64-bit value to string.
|
|
*
|
|
* Ignores `locale' stuff.
|
|
*/
|
|
|
|
char *
|
|
_ufix64toa_r (struct _reent *rptr,
|
|
__uint64_t value,
|
|
int mode,
|
|
int ndigits,
|
|
int *decpt,
|
|
int *sign,
|
|
char **rve)
|
|
{
|
|
union long_double_union ldbl;
|
|
union fix64_union fix64;
|
|
unsigned long tmp;
|
|
int exp, negexp;
|
|
|
|
/* if input is 0, no additional work is needed */
|
|
if (value == 0)
|
|
{
|
|
ldbl.i[0] = ldbl.i[1] = ldbl.i[2] = ldbl.i[3] = 0;
|
|
}
|
|
else /* otherwise, we calculate long double equivalent of value */
|
|
{
|
|
/* find exponent by locating most-significant one-bit */
|
|
fix64.ll = value;
|
|
negexp = 1;
|
|
if (hiword(fix64) == 0)
|
|
{
|
|
tmp = loword(fix64);
|
|
negexp = 33;
|
|
}
|
|
else
|
|
{
|
|
tmp = hiword(fix64);
|
|
negexp = 1;
|
|
}
|
|
|
|
while (negexp < 65)
|
|
{
|
|
if (tmp & 0x80000000)
|
|
break;
|
|
++negexp;
|
|
tmp <<= 1;
|
|
}
|
|
|
|
/* shift input appropriately */
|
|
fix64.ll = value << (negexp - 1 + (Exp_msk1 != 0));
|
|
|
|
/* build long double */
|
|
exp = -negexp + Bias;
|
|
word0(ldbl) = (exp << Exp_shift);
|
|
word1(ldbl) = hiword(fix64) << (32-Ebits-1);
|
|
word2(ldbl) = loword(fix64) << (32-Ebits-1);
|
|
word3(ldbl) = 0;
|
|
if (Ebits+1 < 32)
|
|
{
|
|
word0(ldbl) |= hiword(fix64) >> (Ebits + 1);
|
|
word1(ldbl) |= loword(fix64) >> (Ebits + 1);
|
|
}
|
|
}
|
|
|
|
/* convert long double to character */
|
|
return _simdldtoa_r (rptr, &ldbl, mode, ndigits, decpt, sign, rve);
|
|
}
|
|
|
|
#endif /* __SPE__ */
|