Last change
on this file since 337 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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Rev | Line | |
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[337] | 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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