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
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:
477 bytes
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1 | #include <math.h>
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2 | #include <stdint.h>
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3 |
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4 | float scalbnf(float x, int n)
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5 | {
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6 | union {float f; uint32_t i;} u;
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7 | float_t y = x;
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8 |
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9 | if (n > 127) {
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10 | y *= 0x1p127f;
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11 | n -= 127;
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12 | if (n > 127) {
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13 | y *= 0x1p127f;
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14 | n -= 127;
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15 | if (n > 127)
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16 | n = 127;
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17 | }
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18 | } else if (n < -126) {
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19 | y *= 0x1p-126f * 0x1p24f;
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20 | n += 126 - 24;
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21 | if (n < -126) {
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22 | y *= 0x1p-126f * 0x1p24f;
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23 | n += 126 - 24;
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24 | if (n < -126)
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25 | n = -126;
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26 | }
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27 | }
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28 | u.i = (uint32_t)(0x7f+n)<<23;
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29 | x = y * u.f;
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30 | return x;
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31 | }
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