1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 
  22 /*
  23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  24  */
  25 /*
  26  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
  27  * Use is subject to license terms.
  28  */
  29 
  30 #if defined(ELFOBJ)
  31 #pragma weak fminl = __fminl
  32 #endif
  33 
  34 #include "libm.h"       /* for islessequal macro */
  35 
  36 long double
  37 __fminl(long double x, long double y) {
  38         union {
  39 #if defined(__sparc)
  40                 unsigned i[4];
  41 #elif defined(__x86)
  42                 unsigned i[3];
  43 #else
  44 #error Unknown architecture
  45 #endif
  46                 long double ld;
  47         } xx, yy;
  48         unsigned s;
  49 
  50         /* if y is nan, replace it by x */
  51         if (y != y)
  52                 y = x;
  53 
  54         /* if x is greater than y or x and y are unordered, replace x by y */
  55 #if defined(COMPARISON_MACRO_BUG)
  56         if (x != x || x > y)
  57 #else
  58         if (!islessequal(x, y))
  59 #endif
  60                 x = y;
  61 
  62         /*
  63          * now x and y are either both NaN or both numeric; set the
  64          * sign of the result if either x or y has its sign set
  65          */
  66         xx.ld = x;
  67         yy.ld = y;
  68 #if defined(__sparc)
  69         s = (xx.i[0] | yy.i[0]) & 0x80000000;
  70         xx.i[0] |= s;
  71 #elif defined(__x86)
  72         s = (xx.i[2] | yy.i[2]) & 0x8000;
  73         xx.i[2] |= s;
  74 #else
  75 #error Unknown architecture
  76 #endif
  77 
  78         return (xx.ld);
  79 }