Last change
on this file since 403 was 337, checked in by coas-nagasima, 6 years ago |
ASP3版ECNLを追加
|
-
Property svn:eol-style
set to
native
-
Property svn:mime-type
set to
text/x-csrc;charset=UTF-8
|
File size:
2.2 KB
|
Line | |
---|
1 | #include "libm.h"
|
---|
2 |
|
---|
3 | #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
|
---|
4 | long double remquol(long double x, long double y, int *quo)
|
---|
5 | {
|
---|
6 | return remquo(x, y, quo);
|
---|
7 | }
|
---|
8 | #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
|
---|
9 | long double remquol(long double x, long double y, int *quo)
|
---|
10 | {
|
---|
11 | union ldshape ux = {x}, uy = {y};
|
---|
12 | int ex = ux.i.se & 0x7fff;
|
---|
13 | int ey = uy.i.se & 0x7fff;
|
---|
14 | int sx = ux.i.se >> 15;
|
---|
15 | int sy = uy.i.se >> 15;
|
---|
16 | uint32_t q;
|
---|
17 |
|
---|
18 | *quo = 0;
|
---|
19 | if (y == 0 || isnan(y) || ex == 0x7fff)
|
---|
20 | return (x*y)/(x*y);
|
---|
21 | if (x == 0)
|
---|
22 | return x;
|
---|
23 |
|
---|
24 | /* normalize x and y */
|
---|
25 | if (!ex) {
|
---|
26 | ux.i.se = ex;
|
---|
27 | ux.f *= 0x1p120f;
|
---|
28 | ex = ux.i.se - 120;
|
---|
29 | }
|
---|
30 | if (!ey) {
|
---|
31 | uy.i.se = ey;
|
---|
32 | uy.f *= 0x1p120f;
|
---|
33 | ey = uy.i.se - 120;
|
---|
34 | }
|
---|
35 |
|
---|
36 | q = 0;
|
---|
37 | if (ex >= ey) {
|
---|
38 | /* x mod y */
|
---|
39 | #if LDBL_MANT_DIG == 64
|
---|
40 | uint64_t i, mx, my;
|
---|
41 | mx = ux.i.m;
|
---|
42 | my = uy.i.m;
|
---|
43 | for (; ex > ey; ex--) {
|
---|
44 | i = mx - my;
|
---|
45 | if (mx >= my) {
|
---|
46 | mx = 2*i;
|
---|
47 | q++;
|
---|
48 | q <<= 1;
|
---|
49 | } else if (2*mx < mx) {
|
---|
50 | mx = 2*mx - my;
|
---|
51 | q <<= 1;
|
---|
52 | q++;
|
---|
53 | } else {
|
---|
54 | mx = 2*mx;
|
---|
55 | q <<= 1;
|
---|
56 | }
|
---|
57 | }
|
---|
58 | i = mx - my;
|
---|
59 | if (mx >= my) {
|
---|
60 | mx = i;
|
---|
61 | q++;
|
---|
62 | }
|
---|
63 | if (mx == 0)
|
---|
64 | ex = -120;
|
---|
65 | else
|
---|
66 | for (; mx >> 63 == 0; mx *= 2, ex--);
|
---|
67 | ux.i.m = mx;
|
---|
68 | #elif LDBL_MANT_DIG == 113
|
---|
69 | uint64_t hi, lo, xhi, xlo, yhi, ylo;
|
---|
70 | xhi = (ux.i2.hi & -1ULL>>16) | 1ULL<<48;
|
---|
71 | yhi = (uy.i2.hi & -1ULL>>16) | 1ULL<<48;
|
---|
72 | xlo = ux.i2.lo;
|
---|
73 | ylo = ux.i2.lo;
|
---|
74 | for (; ex > ey; ex--) {
|
---|
75 | hi = xhi - yhi;
|
---|
76 | lo = xlo - ylo;
|
---|
77 | if (xlo < ylo)
|
---|
78 | hi -= 1;
|
---|
79 | if (hi >> 63 == 0) {
|
---|
80 | xhi = 2*hi + (lo>>63);
|
---|
81 | xlo = 2*lo;
|
---|
82 | q++;
|
---|
83 | } else {
|
---|
84 | xhi = 2*xhi + (xlo>>63);
|
---|
85 | xlo = 2*xlo;
|
---|
86 | }
|
---|
87 | q <<= 1;
|
---|
88 | }
|
---|
89 | hi = xhi - yhi;
|
---|
90 | lo = xlo - ylo;
|
---|
91 | if (xlo < ylo)
|
---|
92 | hi -= 1;
|
---|
93 | if (hi >> 63 == 0) {
|
---|
94 | xhi = hi;
|
---|
95 | xlo = lo;
|
---|
96 | q++;
|
---|
97 | }
|
---|
98 | if ((xhi|xlo) == 0)
|
---|
99 | ex = -120;
|
---|
100 | else
|
---|
101 | for (; xhi >> 48 == 0; xhi = 2*xhi + (xlo>>63), xlo = 2*xlo, ex--);
|
---|
102 | ux.i2.hi = xhi;
|
---|
103 | ux.i2.lo = xlo;
|
---|
104 | #endif
|
---|
105 | }
|
---|
106 |
|
---|
107 | /* scale result and decide between |x| and |x|-|y| */
|
---|
108 | if (ex <= 0) {
|
---|
109 | ux.i.se = ex + 120;
|
---|
110 | ux.f *= 0x1p-120f;
|
---|
111 | } else
|
---|
112 | ux.i.se = ex;
|
---|
113 | x = ux.f;
|
---|
114 | if (sy)
|
---|
115 | y = -y;
|
---|
116 | if (ex == ey || (ex+1 == ey && (2*x > y || (2*x == y && q%2)))) {
|
---|
117 | x -= y;
|
---|
118 | q++;
|
---|
119 | }
|
---|
120 | q &= 0x7fffffff;
|
---|
121 | *quo = sx^sy ? -(int)q : (int)q;
|
---|
122 | return sx ? -x : x;
|
---|
123 | }
|
---|
124 | #endif
|
---|
Note:
See
TracBrowser
for help on using the repository browser.