Last change
on this file since 373 was 352, checked in by coas-nagasima, 6 years ago |
arm向けASP3版ECNLを追加
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Property svn:eol-style
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native
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Property svn:mime-type
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text/x-csrc;charset=UTF-8
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File size:
738 bytes
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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 | double nexttoward(double x, long double y)
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5 | {
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6 | return nextafter(x, y);
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7 | }
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8 | #else
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9 | double nexttoward(double x, long double y)
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10 | {
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11 | union {double f; uint64_t i;} ux = {x};
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12 | int e;
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13 |
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14 | if (isnan(x) || isnan(y))
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15 | return x + y;
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16 | if (x == y)
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17 | return y;
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18 | if (x == 0) {
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19 | ux.i = 1;
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20 | if (signbit(y))
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21 | ux.i |= 1ULL<<63;
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22 | } else if (x < y) {
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23 | if (signbit(x))
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24 | ux.i--;
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25 | else
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26 | ux.i++;
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27 | } else {
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28 | if (signbit(x))
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29 | ux.i++;
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30 | else
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31 | ux.i--;
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32 | }
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33 | e = ux.i>>52 & 0x7ff;
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34 | /* raise overflow if ux.f is infinite and x is finite */
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35 | if (e == 0x7ff)
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36 | FORCE_EVAL(x+x);
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37 | /* raise underflow if ux.f is subnormal or zero */
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38 | if (e == 0)
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39 | FORCE_EVAL(x*x + ux.f*ux.f);
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40 | return ux.f;
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41 | }
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42 | #endif
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