Last change
on this file since 367 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:
542 bytes
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1 | #include "libm.h"
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2 |
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3 | float modff(float x, float *iptr)
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4 | {
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5 | union {float f; uint32_t i;} u = {x};
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6 | uint32_t mask;
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7 | int e = (int)(u.i>>23 & 0xff) - 0x7f;
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8 |
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9 | /* no fractional part */
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10 | if (e >= 23) {
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11 | *iptr = x;
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12 | if (e == 0x80 && u.i<<9 != 0) { /* nan */
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13 | return x;
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14 | }
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15 | u.i &= 0x80000000;
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16 | return u.f;
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17 | }
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18 | /* no integral part */
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19 | if (e < 0) {
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20 | u.i &= 0x80000000;
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21 | *iptr = u.f;
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22 | return x;
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23 | }
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24 |
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25 | mask = 0x007fffff>>e;
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26 | if ((u.i & mask) == 0) {
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27 | *iptr = x;
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28 | u.i &= 0x80000000;
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29 | return u.f;
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30 | }
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31 | u.i &= ~mask;
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32 | *iptr = u.f;
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33 | return x - u.f;
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34 | }
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