14f82cb46SDavid Schultz /*- 24f82cb46SDavid Schultz * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> 34f82cb46SDavid Schultz * All rights reserved. 44f82cb46SDavid Schultz * 54f82cb46SDavid Schultz * Redistribution and use in source and binary forms, with or without 64f82cb46SDavid Schultz * modification, are permitted provided that the following conditions 74f82cb46SDavid Schultz * are met: 84f82cb46SDavid Schultz * 1. Redistributions of source code must retain the above copyright 94f82cb46SDavid Schultz * notice, this list of conditions and the following disclaimer. 104f82cb46SDavid Schultz * 2. Redistributions in binary form must reproduce the above copyright 114f82cb46SDavid Schultz * notice, this list of conditions and the following disclaimer in the 124f82cb46SDavid Schultz * documentation and/or other materials provided with the distribution. 134f82cb46SDavid Schultz * 144f82cb46SDavid Schultz * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 154f82cb46SDavid Schultz * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 164f82cb46SDavid Schultz * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 174f82cb46SDavid Schultz * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 184f82cb46SDavid Schultz * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 194f82cb46SDavid Schultz * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 204f82cb46SDavid Schultz * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 214f82cb46SDavid Schultz * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 224f82cb46SDavid Schultz * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 234f82cb46SDavid Schultz * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 244f82cb46SDavid Schultz * SUCH DAMAGE. 254f82cb46SDavid Schultz */ 264f82cb46SDavid Schultz 274f82cb46SDavid Schultz #include <sys/cdefs.h> 284f82cb46SDavid Schultz __FBSDID("$FreeBSD$"); 294f82cb46SDavid Schultz 304f82cb46SDavid Schultz #include <math.h> 314f82cb46SDavid Schultz 324f82cb46SDavid Schultz #include "fpmath.h" 334f82cb46SDavid Schultz 344f82cb46SDavid Schultz double 354f82cb46SDavid Schultz fmin(double x, double y) 364f82cb46SDavid Schultz { 374f82cb46SDavid Schultz union IEEEd2bits u[2]; 384f82cb46SDavid Schultz 394f82cb46SDavid Schultz u[0].d = x; 404f82cb46SDavid Schultz u[1].d = y; 414f82cb46SDavid Schultz 424f82cb46SDavid Schultz /* Check for NaNs to avoid raising spurious exceptions. */ 434f82cb46SDavid Schultz if (u[0].bits.exp == 2047 && (u[0].bits.manh | u[0].bits.manl) != 0) 444f82cb46SDavid Schultz return (y); 454f82cb46SDavid Schultz if (u[1].bits.exp == 2047 && (u[1].bits.manh | u[1].bits.manl) != 0) 464f82cb46SDavid Schultz return (x); 474f82cb46SDavid Schultz 484f82cb46SDavid Schultz /* Handle comparisons of signed zeroes. */ 494f82cb46SDavid Schultz if (u[0].bits.sign != u[1].bits.sign) 504f82cb46SDavid Schultz return (u[u[1].bits.sign].d); 514f82cb46SDavid Schultz 524f82cb46SDavid Schultz return (x < y ? x : y); 534f82cb46SDavid Schultz } 54