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
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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:
2.2 KB
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Rev | Line | |
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[337] | 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 remquol(long double x, long double y, int *quo)
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| 5 | {
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| 6 | return remquo(x, y, quo);
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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 remquol(long double x, long double y, int *quo)
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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 >> 15;
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| 15 | int sy = uy.i.se >> 15;
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| 16 | uint32_t q;
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| 17 |
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| 18 | *quo = 0;
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| 19 | if (y == 0 || isnan(y) || ex == 0x7fff)
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| 20 | return (x*y)/(x*y);
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| 21 | if (x == 0)
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| 22 | return x;
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| 23 |
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| 24 | /* normalize x and y */
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| 25 | if (!ex) {
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| 26 | ux.i.se = ex;
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| 27 | ux.f *= 0x1p120f;
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| 28 | ex = ux.i.se - 120;
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| 29 | }
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| 30 | if (!ey) {
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| 31 | uy.i.se = 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 | q = 0;
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| 37 | if (ex >= ey) {
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| 38 | /* x mod y */
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| 39 | #if LDBL_MANT_DIG == 64
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| 40 | uint64_t i, mx, my;
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| 41 | mx = ux.i.m;
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| 42 | my = uy.i.m;
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| 43 | for (; ex > ey; ex--) {
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| 44 | i = mx - my;
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| 45 | if (mx >= my) {
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| 46 | mx = 2*i;
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| 47 | q++;
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| 48 | q <<= 1;
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| 49 | } else if (2*mx < mx) {
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| 50 | mx = 2*mx - my;
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| 51 | q <<= 1;
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| 52 | q++;
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| 53 | } else {
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| 54 | mx = 2*mx;
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| 55 | q <<= 1;
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| 56 | }
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| 57 | }
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| 58 | i = mx - my;
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| 59 | if (mx >= my) {
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| 60 | mx = i;
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| 61 | q++;
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| 62 | }
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| 63 | if (mx == 0)
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| 64 | ex = -120;
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| 65 | else
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| 66 | for (; mx >> 63 == 0; mx *= 2, ex--);
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| 67 | ux.i.m = mx;
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| 68 | #elif LDBL_MANT_DIG == 113
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| 69 | uint64_t hi, lo, xhi, xlo, yhi, ylo;
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| 70 | xhi = (ux.i2.hi & -1ULL>>16) | 1ULL<<48;
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| 71 | yhi = (uy.i2.hi & -1ULL>>16) | 1ULL<<48;
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| 72 | xlo = ux.i2.lo;
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| 73 | ylo = ux.i2.lo;
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| 74 | for (; ex > ey; ex--) {
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| 75 | hi = xhi - yhi;
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| 76 | lo = xlo - ylo;
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| 77 | if (xlo < ylo)
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| 78 | hi -= 1;
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| 79 | if (hi >> 63 == 0) {
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| 80 | xhi = 2*hi + (lo>>63);
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| 81 | xlo = 2*lo;
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| 82 | q++;
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| 83 | } else {
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| 84 | xhi = 2*xhi + (xlo>>63);
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| 85 | xlo = 2*xlo;
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| 86 | }
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| 87 | q <<= 1;
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| 88 | }
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| 89 | hi = xhi - yhi;
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| 90 | lo = xlo - ylo;
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| 91 | if (xlo < ylo)
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| 92 | hi -= 1;
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| 93 | if (hi >> 63 == 0) {
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| 94 | xhi = hi;
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| 95 | xlo = lo;
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| 96 | q++;
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| 97 | }
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| 98 | if ((xhi|xlo) == 0)
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| 99 | ex = -120;
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| 100 | else
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| 101 | for (; xhi >> 48 == 0; xhi = 2*xhi + (xlo>>63), xlo = 2*xlo, ex--);
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| 102 | ux.i2.hi = xhi;
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| 103 | ux.i2.lo = xlo;
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| 104 | #endif
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| 105 | }
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| 106 |
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| 107 | /* scale result and decide between |x| and |x|-|y| */
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| 108 | if (ex <= 0) {
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| 109 | ux.i.se = ex + 120;
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| 110 | ux.f *= 0x1p-120f;
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| 111 | } else
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| 112 | ux.i.se = ex;
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| 113 | x = ux.f;
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| 114 | if (sy)
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| 115 | y = -y;
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| 116 | if (ex == ey || (ex+1 == ey && (2*x > y || (2*x == y && q%2)))) {
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| 117 | x -= y;
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| 118 | q++;
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| 119 | }
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| 120 | q &= 0x7fffffff;
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| 121 | *quo = sx^sy ? -(int)q : (int)q;
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| 122 | return sx ? -x : x;
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| 123 | }
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| 124 | #endif
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