/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2011 Nexenta Systems, Inc. All rights reserved.
*/
/*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma weak __roundl = roundl
#include "libm.h"
#if defined(__sparc)
long double
roundl(long double x) {
union {
unsigned i[4];
long double q;
} xx;
unsigned hx, sx, v;
int j;
xx.q = x;
sx = xx.i[0] & 0x80000000;
hx = xx.i[0] & ~0x80000000;
/* handle trivial cases */
if (hx >= 0x406f0000) /* |x| >= 2^112 + ... or x is nan */
return (hx >= 0x7fff0000 ? x + x : x);
/* handle |x| < 1 */
if (hx < 0x3fff0000) {
if (hx >= 0x3ffe0000)
return (sx ? -1.0L : 1.0L);
return (sx ? -0.0L : 0.0L);
}
xx.i[0] = hx;
j = 0x406f - (hx >> 16); /* 1 <= j <= 112 */
if (j >= 96) { /* 96 <= j <= 112 */
v = (1U << (j - 96)) >> 1;
if (v) {
if (xx.i[0] & v)
xx.i[0] += v;
xx.i[0] &= ~(v - 1);
} else if (xx.i[1] & 0x80000000)
++xx.i[0];
xx.i[1] = xx.i[2] = xx.i[3] = 0;
} else if (j >= 64) { /* 64 <= j <= 95 */
v = (1U << (j - 64)) >> 1;
if (v) {
if (xx.i[1] & v) {
xx.i[1] += v;
if (xx.i[1] < v)
++xx.i[0];
}
xx.i[1] &= ~(v - 1);
} else if (xx.i[2] & 0x80000000) {
if (++xx.i[1] == 0)
++xx.i[0];
}
xx.i[2] = xx.i[3] = 0;
} else if (j >= 32) { /* 32 <= j <= 63 */
v = (1U << (j - 32)) >> 1;
if (v) {
if (xx.i[2] & v) {
xx.i[2] += v;
if (xx.i[2] < v) {
if (++xx.i[1] == 0)
++xx.i[0];
}
}
xx.i[2] &= ~(v - 1);
} else if (xx.i[3] & 0x80000000) {
if (++xx.i[2] == 0) {
if (++xx.i[1] == 0)
++xx.i[0];
}
}
xx.i[3] = 0;
} else { /* 1 <= j <= 31 */
v = 1U << (j - 1);
if (xx.i[3] & v) {
xx.i[3] += v;
if (xx.i[3] < v) {
if (++xx.i[2] == 0) {
if (++xx.i[1] == 0)
++xx.i[0];
}
}
}
xx.i[3] &= ~(v - 1);
}
/* negate result if need be */
if (sx)
xx.i[0] |= 0x80000000;
return (xx.q);
}
#elif defined(__x86)
long double
roundl(long double x) {
union {
unsigned i[3];
long double e;
} xx;
int ex, sx, i;
xx.e = x;
ex = xx.i[2] & 0x7fff;
sx = xx.i[2] & 0x8000;
if (ex < 0x403e) { /* |x| < 2^63 */
if (ex < 0x3fff) { /* |x| < 1 */
if (ex >= 0x3ffe)
return (sx ? -1.0L : 1.0L);
return (sx ? -0.0L : 0.0L);
}
/* round x at the integer bit */
if (ex < 0x401e) {
i = 1 << (0x401d - ex);
xx.i[1] = (xx.i[1] + i) & ~(i | (i - 1));
xx.i[0] = 0;
} else {
i = 1 << (0x403d - ex);
xx.i[0] += i;
if (xx.i[0] < i)
xx.i[1]++;
xx.i[0] &= ~(i | (i - 1));
}
if (xx.i[1] == 0) {
xx.i[2] = sx | ++ex;
xx.i[1] = 0x80000000U;
}
return (xx.e);
} else if (ex < 0x7fff) /* x is integral */
return (x);
else /* inf or nan */
return (x + x);
}
#else
#error Unknown architecture
#endif /* defined(__sparc) || defined(__x86) */