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Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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42
libc/math/__fpclassifyl.c Normal file
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#include "libc/math/libm.h"
#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
int __fpclassifyl(long double x)
{
return __fpclassify(x);
}
#elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
int __fpclassifyl(long double x)
{
union ldshape u = {x};
int e = u.i.se & 0x7fff;
int msb = u.i.m>>63;
if (!e && !msb)
return u.i.m ? FP_SUBNORMAL : FP_ZERO;
if (e == 0x7fff) {
/* The x86 variant of 80-bit extended precision only admits
* one representation of each infinity, with the mantissa msb
* necessarily set. The version with it clear is invalid/nan.
* The m68k variant, however, allows either, and tooling uses
* the version with it clear. */
if (__BYTE_ORDER == __LITTLE_ENDIAN && !msb)
return FP_NAN;
return u.i.m << 1 ? FP_NAN : FP_INFINITE;
}
if (!msb)
return FP_NAN;
return FP_NORMAL;
}
#elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
int __fpclassifyl(long double x)
{
union ldshape u = {x};
int e = u.i.se & 0x7fff;
u.i.se = 0;
if (!e)
return u.i2.lo | u.i2.hi ? FP_SUBNORMAL : FP_ZERO;
if (e == 0x7fff)
return u.i2.lo | u.i2.hi ? FP_NAN : FP_INFINITE;
return FP_NORMAL;
}
#endif