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
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native
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Property svn:mime-type
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text/x-csrc;charset=UTF-8
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File size:
1.9 KB
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1 | #include "libm.h"
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2 |
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3 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
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4 | long double fmodl(long double x, long double y)
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5 | {
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6 | return fmod(x, y);
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7 | }
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8 | #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
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9 | long double fmodl(long double x, long double y)
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10 | {
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11 | union ldshape ux = {x}, uy = {y};
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12 | int ex = ux.i.se & 0x7fff;
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13 | int ey = uy.i.se & 0x7fff;
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14 | int sx = ux.i.se & 0x8000;
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15 |
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16 | if (y == 0 || isnan(y) || ex == 0x7fff)
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17 | return (x*y)/(x*y);
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18 | ux.i.se = ex;
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19 | uy.i.se = ey;
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20 | if (ux.f <= uy.f) {
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21 | if (ux.f == uy.f)
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22 | return 0*x;
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23 | return x;
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24 | }
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25 |
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26 | /* normalize x and y */
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27 | if (!ex) {
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28 | ux.f *= 0x1p120f;
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29 | ex = ux.i.se - 120;
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30 | }
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31 | if (!ey) {
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32 | uy.f *= 0x1p120f;
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33 | ey = uy.i.se - 120;
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34 | }
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35 |
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36 | /* x mod y */
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37 | #if LDBL_MANT_DIG == 64
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38 | uint64_t i, mx, my;
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39 | mx = ux.i.m;
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40 | my = uy.i.m;
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41 | for (; ex > ey; ex--) {
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42 | i = mx - my;
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43 | if (mx >= my) {
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44 | if (i == 0)
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45 | return 0*x;
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46 | mx = 2*i;
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47 | } else if (2*mx < mx) {
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48 | mx = 2*mx - my;
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49 | } else {
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50 | mx = 2*mx;
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51 | }
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52 | }
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53 | i = mx - my;
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54 | if (mx >= my) {
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55 | if (i == 0)
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56 | return 0*x;
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57 | mx = i;
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58 | }
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59 | for (; mx >> 63 == 0; mx *= 2, ex--);
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60 | ux.i.m = mx;
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61 | #elif LDBL_MANT_DIG == 113
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62 | uint64_t hi, lo, xhi, xlo, yhi, ylo;
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63 | xhi = (ux.i2.hi & -1ULL>>16) | 1ULL<<48;
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64 | yhi = (uy.i2.hi & -1ULL>>16) | 1ULL<<48;
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65 | xlo = ux.i2.lo;
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66 | ylo = uy.i2.lo;
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67 | for (; ex > ey; ex--) {
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68 | hi = xhi - yhi;
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69 | lo = xlo - ylo;
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70 | if (xlo < ylo)
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71 | hi -= 1;
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72 | if (hi >> 63 == 0) {
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73 | if ((hi|lo) == 0)
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74 | return 0*x;
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75 | xhi = 2*hi + (lo>>63);
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76 | xlo = 2*lo;
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77 | } else {
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78 | xhi = 2*xhi + (xlo>>63);
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79 | xlo = 2*xlo;
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80 | }
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81 | }
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82 | hi = xhi - yhi;
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83 | lo = xlo - ylo;
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84 | if (xlo < ylo)
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85 | hi -= 1;
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86 | if (hi >> 63 == 0) {
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87 | if ((hi|lo) == 0)
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88 | return 0*x;
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89 | xhi = hi;
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90 | xlo = lo;
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91 | }
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92 | for (; xhi >> 48 == 0; xhi = 2*xhi + (xlo>>63), xlo = 2*xlo, ex--);
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93 | ux.i2.hi = xhi;
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94 | ux.i2.lo = xlo;
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95 | #endif
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96 |
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97 | /* scale result */
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98 | if (ex <= 0) {
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99 | ux.i.se = (ex+120)|sx;
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100 | ux.f *= 0x1p-120f;
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101 | } else
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102 | ux.i.se = ex|sx;
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103 | return ux.f;
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104 | }
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105 | #endif
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