Last change
on this file since 351 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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Property svn:eol-style
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Property svn:mime-type
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File size:
917 bytes
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[337] | 1 | #include "libm.h"
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| 2 |
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| 3 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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| 4 | long double modfl(long double x, long double *iptr)
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| 5 | {
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| 6 | double d;
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| 7 | long double r;
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| 8 |
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| 9 | r = modf(x, &d);
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| 10 | *iptr = d;
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| 11 | return r;
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| 12 | }
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| 13 | #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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| 14 |
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| 15 | static const long double toint = 1/LDBL_EPSILON;
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| 16 |
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| 17 | long double modfl(long double x, long double *iptr)
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| 18 | {
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| 19 | union ldshape u = {x};
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| 20 | int e = (u.i.se & 0x7fff) - 0x3fff;
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| 21 | int s = u.i.se >> 15;
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| 22 | long double absx;
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| 23 | long double y;
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| 24 |
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| 25 | /* no fractional part */
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| 26 | if (e >= LDBL_MANT_DIG-1) {
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| 27 | *iptr = x;
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| 28 | if (isnan(x))
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| 29 | return x;
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| 30 | return s ? -0.0 : 0.0;
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| 31 | }
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| 32 |
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| 33 | /* no integral part*/
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| 34 | if (e < 0) {
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| 35 | *iptr = s ? -0.0 : 0.0;
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| 36 | return x;
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| 37 | }
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| 38 |
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| 39 | /* raises spurious inexact */
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| 40 | absx = s ? -x : x;
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| 41 | y = absx + toint - toint - absx;
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| 42 | if (y == 0) {
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| 43 | *iptr = x;
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| 44 | return s ? -0.0 : 0.0;
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| 45 | }
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| 46 | if (y > 0)
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| 47 | y -= 1;
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| 48 | if (s)
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| 49 | y = -y;
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| 50 | *iptr = x + y;
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| 51 | return -y;
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| 52 | }
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| 53 | #endif
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