Last change
on this file since 389 was 389, checked in by coas-nagasima, 5 years ago |
ビルドが通るよう更新
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Property svn:eol-style
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native
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Property svn:mime-type
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File size:
579 bytes
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[388] | 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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