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 /*
  27  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 
  31 #pragma weak __erff = erff
  32 #pragma weak __erfcf = erfcf
  33 
  34 #include "libm.h"
  35 
  36 #if defined(__i386) && !defined(__amd64)
  37 extern int __swapRP(int);
  38 #endif
  39 
  40 float
  41 erff(float x)
  42 {
  43         int ix;
  44 
  45         ix = *(int *)&x & ~0x80000000;
  46 
  47         if (ix > 0x7f800000)         /* x is NaN */
  48                 return (x * x);
  49 
  50         return ((float)erf((double)x));
  51 }
  52 
  53 float
  54 erfcf(float x)
  55 {
  56         float f;
  57         int ix;
  58 
  59 #if defined(__i386) && !defined(__amd64)
  60         int rp;
  61 #endif
  62 
  63         ix = *(int *)&x & ~0x80000000;
  64 
  65         if (ix > 0x7f800000)         /* x is NaN */
  66                 return (x * x);
  67 
  68 #if defined(__i386) && !defined(__amd64)
  69         rp = __swapRP(fp_extended);
  70 #endif
  71         f = (float)erfc((double)x);
  72 #if defined(__i386) && !defined(__amd64)
  73         if (rp != fp_extended)
  74                 (void) __swapRP(rp);
  75 #endif
  76         return (f);
  77 }