1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
|
/* s_floorl.c -- long double version of s_floor.c.
* Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#if defined(LIBM_SCCS) && !defined(lint)
static char rcsid[] = "$NetBSD: $";
#endif
/*
* floorl(x)
* Return x rounded toward -inf to integral value
* Method:
* Bit twiddling.
*/
#define NO_MATH_REDIRECT
#include <math.h>
#include <math_private.h>
#include <libm-alias-ldouble.h>
#include <math-use-builtins.h>
_Float128 __floorl(_Float128 x)
{
#if USE_FLOORL_BUILTIN
return __builtin_floorl (x);
#else
/* Use generic implementation. */
int64_t i0,i1,j0;
uint64_t i,j;
GET_LDOUBLE_WORDS64(i0,i1,x);
j0 = ((i0>>48)&0x7fff)-0x3fff;
if(j0<48) {
if(j0<0) {
/* return 0*sign(x) if |x|<1 */
if(i0>=0) {i0=i1=0;}
else if(((i0&0x7fffffffffffffffLL)|i1)!=0)
{ i0=0xbfff000000000000ULL;i1=0;}
} else {
i = (0x0000ffffffffffffULL)>>j0;
if(((i0&i)|i1)==0) return x; /* x is integral */
if(i0<0) i0 += (0x0001000000000000LL)>>j0;
i0 &= (~i); i1=0;
}
} else if (j0>111) {
if(j0==0x4000) return x+x; /* inf or NaN */
else return x; /* x is integral */
} else {
i = -1ULL>>(j0-48);
if((i1&i)==0) return x; /* x is integral */
if(i0<0) {
if(j0==48) i0+=1;
else {
j = i1+(1LL<<(112-j0));
if(j<i1) i0 +=1 ; /* got a carry */
i1=j;
}
}
i1 &= (~i);
}
SET_LDOUBLE_WORDS64(x,i0,i1);
return x;
#endif /* ! USE_FLOORL_BUILTIN */
}
libm_alias_ldouble (__floor, floor)
|
