src/math/__fpclassifyl.c

   1 #include "libm.h"
   2
   3 #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
   4 int __fpclassifyl(long double x)
   5 {
   6         return __fpclassify(x);
   7 }
   8 #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
   9 int __fpclassifyl(long double x)
  10 {
  11         union ldshape u = {x};
  12         int e = u.i.se & 0x7fff;
  13         int msb = u.i.m>>63;
  14         if (!e && !msb)
  15                 return u.i.m ? FP_SUBNORMAL : FP_ZERO;
  16         if (e == 0x7fff) {
  17                 /* The x86 variant of 80-bit extended precision only admits
  18                  * one representation of each infinity, with the mantissa msb
  19                  * necessarily set. The version with it clear is invalid/nan.
  20                  * The m68k variant, however, allows either, and tooling uses
  21                  * the version with it clear. */
  22                 if (__BYTE_ORDER == __LITTLE_ENDIAN && !msb)
  23                         return FP_NAN;
  24                 return u.i.m << 1 ? FP_NAN : FP_INFINITE;
  25         }
  26         if (!msb)
  27                 return FP_NAN;
  28         return FP_NORMAL;
  29 }
  30 #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
  31 int __fpclassifyl(long double x)
  32 {
  33         union ldshape u = {x};
  34         int e = u.i.se & 0x7fff;
  35         u.i.se = 0;
  36         if (!e)
  37                 return u.i2.lo | u.i2.hi ? FP_SUBNORMAL : FP_ZERO;
  38         if (e == 0x7fff)
  39                 return u.i2.lo | u.i2.hi ? FP_NAN : FP_INFINITE;
  40         return FP_NORMAL;
  41 }
  42 #endif