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:
579 bytes
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1 | #define _GNU_SOURCE
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2 | #include <math.h>
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3 | #include <stdint.h>
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4 | #include "libc.h"
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5 |
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6 | float exp10f(float x)
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7 | {
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8 | static const float p10[] = {
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9 | 1e-7f, 1e-6f, 1e-5f, 1e-4f, 1e-3f, 1e-2f, 1e-1f,
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10 | 1, 1e1, 1e2, 1e3, 1e4, 1e5, 1e6, 1e7
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11 | };
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12 | float n, y = modff(x, &n);
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13 | union {float f; uint32_t i;} u = {n};
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14 | /* fabsf(n) < 8 without raising invalid on nan */
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15 | if ((u.i>>23 & 0xff) < 0x7f+3) {
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16 | if (!y) return p10[(int)n+7];
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17 | y = exp2f(3.32192809488736234787031942948939f * y);
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18 | return y * p10[(int)n+7];
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19 | }
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20 | return exp2(3.32192809488736234787031942948939 * x);
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21 | }
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22 |
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23 | weak_alias(exp10f, pow10f);
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