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:
585 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 hypotf(float x, float y)
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5 | {
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6 | union {float f; uint32_t i;} ux = {x}, uy = {y}, ut;
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7 | float_t z;
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8 |
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9 | ux.i &= -1U>>1;
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10 | uy.i &= -1U>>1;
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11 | if (ux.i < uy.i) {
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12 | ut = ux;
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13 | ux = uy;
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14 | uy = ut;
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15 | }
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16 |
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17 | x = ux.f;
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18 | y = uy.f;
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19 | if (uy.i == 0xff<<23)
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20 | return y;
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21 | if (ux.i >= 0xff<<23 || uy.i == 0 || ux.i - uy.i >= 25<<23)
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22 | return x + y;
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23 |
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24 | z = 1;
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25 | if (ux.i >= (0x7f+60)<<23) {
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26 | z = 0x1p90f;
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27 | x *= 0x1p-90f;
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28 | y *= 0x1p-90f;
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29 | } else if (uy.i < (0x7f-60)<<23) {
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30 | z = 0x1p-90f;
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31 | x *= 0x1p90f;
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32 | y *= 0x1p90f;
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33 | }
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34 | return z*sqrtf((double)x*x + (double)y*y);
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35 | }
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