toolchain/gcc/newlib/libc/machine/powerpc/strtoufix64.c

   1 #ifdef __SPE__
   2
   3 #include <_ansi.h>
   4 #include <limits.h>
   5 #include <errno.h>
   6 #include <stdlib.h>
   7 #include <reent.h>
   8 #include "fix64.h"
   9
  10 /*
  11  * Convert a string to a fixed-point 64-bit unsigned value.
  12  *
  13  * Ignores `locale' stuff.
  14  */
  15 __uint64_t
  16 _DEFUN (_strtoufix64_r, (rptr, nptr, endptr),
  17         struct _reent *rptr _AND
  18         _CONST char *nptr _AND
  19         char **endptr)
  20 {
  21   union long_double_union ldbl;
  22   int exp, sign, negexp, ld_type;
  23   __uint64_t tmp, tmp2, result = 0;
  24
  25   init(ldbl);
  26
  27   _simdstrtold ((char *)nptr, endptr, &ldbl);
  28
  29   /* treat NAN as domain error, +/- infinity as saturation */
  30   ld_type = _simdldcheck (&ldbl);
  31   if (ld_type != 0)
  32     {
  33       if (ld_type == 1)
  34         {
  35           rptr->_errno = EDOM;
  36           return 0;
  37         }
  38       rptr->_errno = ERANGE;
  39       if (word0(ldbl) & Sign_bit)
  40         return 0;
  41       return ULONG_LONG_MAX;
  42     }
  43
  44   /* strip off sign and exponent */
  45   sign = word0(ldbl) & Sign_bit;
  46   exp = ((word0(ldbl) & Exp_mask) >> Exp_shift) - Bias;
  47   negexp = -exp;
  48   if (negexp > 63)
  49     return 0;
  50   word0(ldbl) &= ~(Exp_mask | Sign_bit);
  51   /* add in implicit normalized bit */
  52   word0(ldbl) |= Exp_msk1;
  53   /* shift so result is contained in single word */
  54   tmp = word0(ldbl) << Ebits;
  55   tmp |= ((unsigned long)word1(ldbl) >> (32 - Ebits));
  56   tmp <<= 32;
  57   if (Ebits < 32)
  58     tmp |= ((unsigned long)word1(ldbl) << Ebits);
  59   tmp |= ((unsigned long)word2(ldbl) >> (32 - Ebits));
  60
  61   /* check for saturation */
  62   if (sign)
  63     {
  64       rptr->_errno = ERANGE;
  65       return 0;
  66     }
  67   else
  68     {
  69       if (exp > 0 || (exp == 0 && tmp >= 0x8000000000000000LL))
  70         {
  71           rptr->_errno = ERANGE;
  72           return ULONG_LONG_MAX;
  73         }
  74     }
  75
  76   /* otherwise we have normal number in range */
  77   if (negexp > 1)
  78     {
  79       tmp2 = tmp + (1 << (negexp - 2));
  80       result = (tmp2 >> (negexp - 1));
  81       /* if rounding causes carry, add carry bit in */
  82       if (tmp2 < tmp)
  83         result += 1 << (64 - negexp);
  84     }
  85   else
  86     {
  87       if (Ebits < 32)
  88         {
  89           result = tmp + ((word2(ldbl) & (1 << (32 - Ebits - 1))) != 0);
  90           /* if rounding causes carry, then saturation has occurred */
  91           if (result < tmp)
  92             {
  93               rptr->_errno = ERANGE;
  94               return ULONG_LONG_MAX;
  95             }
  96         }
  97       else
  98         result = tmp;
  99     }
 100
 101   return result;
 102 }
 103
 104 #ifndef _REENT_ONLY
 105
 106 __uint64_t
 107 _DEFUN (strtoufix64, (s, ptr, base),
 108         _CONST char *s _AND
 109         char **ptr)
 110 {
 111   return _strtoufix64_r (_REENT, s, ptr);
 112 }
 113
 114 #endif
 115
 116 #endif /* __SPE__ */