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
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Property svn:mime-type
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File size:
1004 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 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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5 | int ilogbl(long double x)
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6 | {
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7 | return ilogb(x);
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8 | }
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9 | #elif LDBL_MANT_DIG == 64 && LDBL_MAX_EXP == 16384
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10 | int ilogbl(long double x)
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11 | {
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12 | #pragma STDC FENV_ACCESS ON
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13 | union ldshape u = {x};
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14 | uint64_t m = u.i.m;
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15 | int e = u.i.se & 0x7fff;
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16 |
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17 | if (!e) {
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18 | if (m == 0) {
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19 | FORCE_EVAL(0/0.0f);
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20 | return FP_ILOGB0;
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21 | }
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22 | /* subnormal x */
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23 | for (e = -0x3fff+1; m>>63 == 0; e--, m<<=1);
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24 | return e;
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25 | }
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26 | if (e == 0x7fff) {
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27 | FORCE_EVAL(0/0.0f);
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28 | return m<<1 ? FP_ILOGBNAN : INT_MAX;
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29 | }
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30 | return e - 0x3fff;
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31 | }
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32 | #elif LDBL_MANT_DIG == 113 && LDBL_MAX_EXP == 16384
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33 | int ilogbl(long double x)
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34 | {
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35 | #pragma STDC FENV_ACCESS ON
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36 | union ldshape u = {x};
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37 | int e = u.i.se & 0x7fff;
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38 |
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39 | if (!e) {
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40 | if (x == 0) {
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41 | FORCE_EVAL(0/0.0f);
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42 | return FP_ILOGB0;
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43 | }
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44 | /* subnormal x */
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45 | x *= 0x1p120;
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46 | return ilogbl(x) - 120;
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47 | }
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48 | if (e == 0x7fff) {
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49 | FORCE_EVAL(0/0.0f);
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50 | u.i.se = 0;
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51 | return u.f ? FP_ILOGBNAN : INT_MAX;
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52 | }
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53 | return e - 0x3fff;
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54 | }
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55 | #endif
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