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Diffstat (limited to 'lib/libm/src/s_fmin.c')
| -rw-r--r-- | lib/libm/src/s_fmin.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/lib/libm/src/s_fmin.c b/lib/libm/src/s_fmin.c new file mode 100644 index 00000000000..47c5d9a67a9 --- /dev/null +++ b/lib/libm/src/s_fmin.c @@ -0,0 +1,55 @@ +/* $OpenBSD: s_fmin.c,v 1.1 2008/09/07 20:36:09 martynas Exp $ */ +/*- + * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include <sys/types.h> +#include <machine/ieee.h> +#include <math.h> + +double +fmin(double x, double y) +{ + struct ieee_double *px = (struct ieee_double *)&x; + struct ieee_double *py = (struct ieee_double *)&y; + + /* Check for NaNs to avoid raising spurious exceptions. */ + if (px->dbl_exp == DBL_EXP_INFNAN && + (px->dbl_frach | px->dbl_fracl) != 0) + return (y); + if (py->dbl_exp == DBL_EXP_INFNAN && + (py->dbl_frach | py->dbl_fracl) != 0) + return (x); + + /* Handle comparisons of signed zeroes. */ + if (px->dbl_sign != py->dbl_sign && + py->dbl_sign == 1) + return (y); + if (px->dbl_sign != py->dbl_sign && + py->dbl_sign == 0) + return (x); + + return (x < y ? x : y); +} |