2 * ====================================================
3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
5 * Developed at SunPro, a Sun Microsystems, Inc. business.
6 * Permission to use, copy, modify, and distribute this
7 * software is freely granted, provided that this notice
9 * ====================================================
11 * From: @(#)s_floor.c 5.1 93/09/24
16 * Return x rounded toward 0 to integral value
20 * Inexact flag raised if x not equal to truncl(x).
23 #include <sys/types.h>
24 #include <machine/ieee.h>
30 #include "math_private.h"
32 #ifdef LDBL_IMPLICIT_NBIT
33 #define MANH_SIZE (EXT_FRACHBITS + 1)
35 #define MANH_SIZE EXT_FRACHBITS
38 static const long double huge = 1.0e300;
39 static const float zero[] = { 0.0, -0.0 };
47 GET_LDOUBLE_WORDS(es,ix0,ix1,x);
48 e = (es&0x7fff) - LDBL_MAX_EXP + 1;
50 if (e < MANH_SIZE - 1) {
51 if (e < 0) { /* raise inexact if x != 0 */
53 return (zero[(es&0x8000)!=0]);
55 uint64_t m = ((1llu << MANH_SIZE) - 1) >> (e + 1);
56 if (((ix0 & m) | ix1) == 0)
57 return (x); /* x is integral */
58 if (huge + x > 0.0) { /* raise inexact flag */
63 } else if (e < LDBL_MANT_DIG - 1) {
64 uint64_t m = (uint64_t)-1 >> (64 - LDBL_MANT_DIG + e + 1);
66 return (x); /* x is integral */
67 if (huge + x > 0.0) /* raise inexact flag */
70 SET_LDOUBLE_WORDS(x,es,ix0,ix1);