Last change
on this file since 403 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:
438 bytes
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1 | #include <limits.h>
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2 | #include "libm.h"
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3 |
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4 | int ilogbf(float x)
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5 | {
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6 | #pragma STDC FENV_ACCESS ON
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7 | union {float f; uint32_t i;} u = {x};
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8 | uint32_t i = u.i;
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9 | int e = i>>23 & 0xff;
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10 |
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11 | if (!e) {
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12 | i <<= 9;
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13 | if (i == 0) {
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14 | FORCE_EVAL(0/0.0f);
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15 | return FP_ILOGB0;
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16 | }
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17 | /* subnormal x */
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18 | for (e = -0x7f; i>>31 == 0; e--, i<<=1);
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19 | return e;
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20 | }
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21 | if (e == 0xff) {
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22 | FORCE_EVAL(0/0.0f);
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23 | return i<<9 ? FP_ILOGBNAN : INT_MAX;
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24 | }
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25 | return e - 0x7f;
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26 | }
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