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:
492 bytes
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1 | #include "libm.h"
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2 |
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3 | float coshf(float x)
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4 | {
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5 | union {float f; uint32_t i;} u = {.f = x};
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6 | uint32_t w;
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7 | float t;
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8 |
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9 | /* |x| */
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10 | u.i &= 0x7fffffff;
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11 | x = u.f;
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12 | w = u.i;
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13 |
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14 | /* |x| < log(2) */
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15 | if (w < 0x3f317217) {
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16 | if (w < 0x3f800000 - (12<<23)) {
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17 | FORCE_EVAL(x + 0x1p120f);
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18 | return 1;
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19 | }
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20 | t = expm1f(x);
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21 | return 1 + t*t/(2*(1+t));
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22 | }
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23 |
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24 | /* |x| < log(FLT_MAX) */
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25 | if (w < 0x42b17217) {
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26 | t = expf(x);
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27 | return 0.5f*(t + 1/t);
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28 | }
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29 |
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30 | /* |x| > log(FLT_MAX) or nan */
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31 | t = __expo2f(x);
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32 | return t;
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33 | }
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