/*
* 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 modfl = __modfl
#include "libm.h"
#if defined(__sparc)
long double
__modfl(long double x, long double *iptr) {
union {
unsigned i[4];
long double q;
} xx, yy;
unsigned hx, s;
xx.q = x;
hx = xx.i[0] & ~0x80000000;
if (hx >= 0x406f0000) { /* x is NaN, infinite, or integral */
*iptr = x;
if (hx < 0x7fff0000 || (hx == 0x7fff0000 &&
(xx.i[1] | xx.i[2] | xx.i[3]) == 0)) {
xx.i[0] &= 0x80000000;
xx.i[1] = xx.i[2] = xx.i[3] = 0;
}
return (xx.q);
}
if (hx < 0x3fff0000) { /* |x| < 1 */
xx.i[0] &= 0x80000000;
xx.i[1] = xx.i[2] = xx.i[3] = 0;
*iptr = xx.q;
return (x);
}
/* split x at the binary point */
s = xx.i[0] & 0x80000000;
if (hx < 0x40100000) {
yy.i[0] = xx.i[0] & ~((1 << (0x400f - (hx >> 16))) - 1);
yy.i[1] = yy.i[2] = yy.i[3] = 0;
} else if (hx < 0x40300000) {
yy.i[0] = xx.i[0];
yy.i[1] = xx.i[1] & ~((1 << (0x402f - (hx >> 16))) - 1);
yy.i[2] = yy.i[3] = 0;
} else if (hx < 0x40500000) {
yy.i[0] = xx.i[0];
yy.i[1] = xx.i[1];
yy.i[2] = xx.i[2] & ~((1 << (0x404f - (hx >> 16))) - 1);
yy.i[3] = 0;
} else {
yy.i[0] = xx.i[0];
yy.i[1] = xx.i[1];
yy.i[2] = xx.i[2];
yy.i[3] = xx.i[3] & ~((1 << (0x406f - (hx >> 16))) - 1);
}
*iptr = yy.q;
/*
* we could implement the following more efficiently than by using
* software emulation of fsubq, but we'll do it this way for now
* (and hope hardware support becomes commonplace)
*/
xx.q -= yy.q;
xx.i[0] = (xx.i[0] & ~0x80000000) | s; /* keep sign of x */
return (xx.q);
}
#elif defined(__x86)
long double
__modfl(long double x, long double *iptr) {
union {
unsigned i[3];
long double e;
} xx, yy;
unsigned hx, s;
/*
* It might be faster to use one of the x86 fpops instead of
* the following.
*/
xx.e = x;
hx = xx.i[2] & 0x7fff;
if (hx >= 0x403e) { /* x is NaN, infinite, or integral */
*iptr = x;
if (hx < 0x7fff || (hx == 0x7fff &&
((xx.i[1] << 1) | xx.i[0]) == 0)) {
xx.i[2] &= 0x8000;
xx.i[1] = xx.i[0] = 0;
}
return (xx.e);
}
if (hx < 0x3fff) { /* |x| < 1 */
xx.i[2] &= 0x8000;
xx.i[1] = xx.i[0] = 0;
*iptr = xx.e;
return (x);
}
/* split x at the binary point */
s = xx.i[2] & 0x8000;
yy.i[2] = xx.i[2];
if (hx < 0x401f) {
yy.i[1] = xx.i[1] & ~((1 << (0x401e - hx)) - 1);
yy.i[0] = 0;
} else {
yy.i[1] = xx.i[1];
yy.i[0] = xx.i[0] & ~((1 << (0x403e - hx)) - 1);
}
*iptr = yy.e;
xx.e -= yy.e;
xx.i[2] = (xx.i[2] & ~0x8000) | s; /* keep sign of x */
return (xx.e);
}
#else
#error Unknown architecture
#endif