source: asp3_tinet_ecnl_rx/trunk/musl-1.1.18/src/math/floorl.c@ 337

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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File size: 745 bytes
Line 
1#include "libm.h"
2
3#if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
4long double floorl(long double x)
5{
6 return floor(x);
7}
8#elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
9
10static const long double toint = 1/LDBL_EPSILON;
11
12long double floorl(long double x)
13{
14 union ldshape u = {x};
15 int e = u.i.se & 0x7fff;
16 long double y;
17
18 if (e >= 0x3fff+LDBL_MANT_DIG-1 || x == 0)
19 return x;
20 /* y = int(x) - x, where int(x) is an integer neighbor of x */
21 if (u.i.se >> 15)
22 y = x - toint + toint - x;
23 else
24 y = x + toint - toint - x;
25 /* special case because of non-nearest rounding modes */
26 if (e <= 0x3fff-1) {
27 FORCE_EVAL(y);
28 return u.i.se >> 15 ? -1 : 0;
29 }
30 if (y > 0)
31 return x + y - 1;
32 return x + y;
33}
34#endif
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