__fpclassifyl.c raw

   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
  43