/*
 * 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 fminf = __fminf

#include "libm.h"       /* for islessequal macro */

float
__fminf(float x, float y) {
        /*
         * On SPARC v8plus/v9, this could be implemented as follows
         * (assuming %f0 = x, %f1 = y, return value left in %f0):
         *
         * fcmps        %fcc0,%f1,%f1
         * fmovsu       %fcc0,%f0,%f1
         * fcmps        %fcc0,%f0,%f1
         * fmovsug      %fcc0,%f1,%f0
         * st           %f0,[x]
         * st           %f1,[y]
         * ld           [x],%l0
         * ld           [y],%l1
         * or           %l0,%l1,%l2
         * sethi        %hi(0x80000000),%l3
         * and          %l3,%l2,%l2
         * or           %l0,%l2,%l0
         * st           %l0,[x]
         * ld           [x],%f0
         *
         * If VIS instructions are available, use this code instead:
         *
         * fcmps        %fcc0,%f1,%f1
         * fmovsu       %fcc0,%f0,%f1
         * fcmps        %fcc0,%f0,%f1
         * fmovsug      %fcc0,%f1,%f0
         * fors         %f0,%f1,%f2
         * fzeros       %f3
         * fnegs        %f3,%f3
         * fands        %f3,%f2,%f2
         * fors         %f0,%f2,%f0
         *
         * If VIS 3.0 instructions are available, use this:
         *
         * flcmps       %fcc0,%f0,%f1
         * fmovsge      %fcc0,%f1,%f0   ! move if %fcc0 is 0 or 2
         */

        union {
                unsigned i;
                float f;
        } xx, yy;
        unsigned s;

        /* if y is nan, replace it by x */
        if (y != y)
                y = x;

        /* if x is nan, replace it by y */
        if (x != x)
                x = y;

        /* At this point, x and y are either both numeric, or both NaN */
        if (!isnan(x) && !islessequal(x, y))
                x = y;

        /*
         * set the sign of the result if either x or y has its sign set
         */
        xx.f = x;
        yy.f = y;
        s = (xx.i | yy.i) & 0x80000000;
        xx.i |= s;

        return (xx.f);
}