54 lines
927 B
C
54 lines
927 B
C
#include "libc/math/libm.h"
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#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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long double modfl(long double x, long double *iptr)
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{
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double d;
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long double r;
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r = modf(x, &d);
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*iptr = d;
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return r;
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}
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#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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static const long double toint = 1/LDBL_EPSILON;
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long double modfl(long double x, long double *iptr)
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{
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union ldshape u = {x};
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int e = (u.i.se & 0x7fff) - 0x3fff;
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int s = u.i.se >> 15;
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long double absx;
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long double y;
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/* no fractional part */
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if (e >= LDBL_MANT_DIG-1) {
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*iptr = x;
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if (isnan(x))
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return x;
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return s ? -0.0 : 0.0;
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}
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/* no integral part*/
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if (e < 0) {
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*iptr = s ? -0.0 : 0.0;
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return x;
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}
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/* raises spurious inexact */
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absx = s ? -x : x;
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y = absx + toint - toint - absx;
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if (y == 0) {
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*iptr = x;
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return s ? -0.0 : 0.0;
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}
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if (y > 0)
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y -= 1;
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if (s)
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y = -y;
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*iptr = x + y;
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return -y;
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}
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#endif
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