mirror of
https://github.com/autc04/Retro68.git
synced 2024-09-01 00:29:17 +00:00
100 lines
1.9 KiB
C
100 lines
1.9 KiB
C
#ifdef __SPE__
|
|
|
|
#include <_ansi.h>
|
|
#include <limits.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <reent.h>
|
|
#include "vfieeefp.h"
|
|
|
|
/*
|
|
* Convert a string to a fixed-point 32-bit value.
|
|
*
|
|
* Ignores `locale' stuff.
|
|
*/
|
|
__uint32_t
|
|
_strtoufix32_r (struct _reent *rptr,
|
|
const char *nptr,
|
|
char **endptr)
|
|
{
|
|
union double_union dbl;
|
|
int exp, negexp;
|
|
__uint32_t tmp, tmp2, result = 0;
|
|
|
|
dbl.d = _strtod_r (rptr, nptr, endptr);
|
|
|
|
/* treat NAN as domain error, +/- infinity as saturation */
|
|
if (!finite(dbl.d))
|
|
{
|
|
if (isnan (dbl.d))
|
|
{
|
|
rptr->_errno = EDOM;
|
|
return 0;
|
|
}
|
|
rptr->_errno = ERANGE;
|
|
if (word0(dbl) & Sign_bit)
|
|
return 0;
|
|
return ULONG_MAX;
|
|
}
|
|
|
|
/* check for normal saturation */
|
|
if (dbl.d >= 1.0)
|
|
{
|
|
rptr->_errno = ERANGE;
|
|
return ULONG_MAX;
|
|
}
|
|
else if (dbl.d < 0)
|
|
{
|
|
rptr->_errno = ERANGE;
|
|
return 0;
|
|
}
|
|
|
|
/* otherwise we have normal positive number in range */
|
|
|
|
/* strip off exponent */
|
|
exp = ((word0(dbl) & Exp_mask) >> Exp_shift) - Bias;
|
|
negexp = -exp;
|
|
if (negexp > 32)
|
|
return 0;
|
|
word0(dbl) &= ~(Exp_mask | Sign_bit);
|
|
/* add in implicit normalized bit */
|
|
word0(dbl) |= Exp_msk1;
|
|
/* shift so result is contained left-justified in word */
|
|
tmp = word0(dbl) << Ebits;
|
|
tmp |= ((unsigned long)word1(dbl) >> (32 - Ebits));
|
|
/* perform rounding */
|
|
if (negexp > 1)
|
|
{
|
|
tmp2 = tmp + (1 << (negexp - 2));
|
|
result = (tmp2 >> (negexp - 1));
|
|
/* if rounding causes carry, add carry bit in */
|
|
if (tmp2 < tmp)
|
|
result += 1 << (32 - negexp);
|
|
}
|
|
else
|
|
{
|
|
result = tmp + ((word1(dbl) & (1 << (32 - Ebits - 1))) != 0);
|
|
/* if rounding causes carry, then saturation has occurred */
|
|
if (result < tmp)
|
|
{
|
|
rptr->_errno = ERANGE;
|
|
return ULONG_MAX;
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
#ifndef _REENT_ONLY
|
|
|
|
__uint32_t
|
|
strtoufix32 (const char *s,
|
|
char **ptr)
|
|
{
|
|
return _strtoufix32_r (_REENT, s, ptr);
|
|
}
|
|
|
|
#endif
|
|
|
|
#endif /* __SPE__ */
|