Last change
on this file since 403 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
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Property svn:eol-style
set to
native
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Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
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File size:
634 bytes
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1 | #include "libm.h"
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2 |
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3 | double nextafter(double x, double y)
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4 | {
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5 | union {double f; uint64_t i;} ux={x}, uy={y};
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6 | uint64_t ax, ay;
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7 | int e;
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8 |
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9 | if (isnan(x) || isnan(y))
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10 | return x + y;
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11 | if (ux.i == uy.i)
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12 | return y;
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13 | ax = ux.i & -1ULL/2;
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14 | ay = uy.i & -1ULL/2;
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15 | if (ax == 0) {
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16 | if (ay == 0)
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17 | return y;
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18 | ux.i = (uy.i & 1ULL<<63) | 1;
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19 | } else if (ax > ay || ((ux.i ^ uy.i) & 1ULL<<63))
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20 | ux.i--;
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21 | else
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22 | ux.i++;
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23 | e = ux.i >> 52 & 0x7ff;
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24 | /* raise overflow if ux.f is infinite and x is finite */
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25 | if (e == 0x7ff)
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26 | FORCE_EVAL(x+x);
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27 | /* raise underflow if ux.f is subnormal or zero */
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28 | if (e == 0)
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29 | FORCE_EVAL(x*x + ux.f*ux.f);
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30 | return ux.f;
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31 | }
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