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  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
  23  */
  24 /*
  25  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
  26  * Use is subject to license terms.
  27  */
  28 
  29 #pragma weak erff = __erff
  30 #pragma weak erfcf = __erfcf
  31 
  32 #include "libm.h"
  33 
  34 #if defined(__i386) && !defined(__amd64)
  35 extern int __swapRP(int);
  36 #endif
  37 
  38 float
  39 erff(float x) {
  40         int     ix;
  41 
  42         ix = *(int *)&x & ~0x80000000;
  43         if (ix > 0x7f800000) /* x is NaN */
  44                 return (x * x);
  45         return ((float)erf((double)x));
  46 }
  47 
  48 float
  49 erfcf(float x) {
  50         float   f;
  51         int     ix;
  52 #if defined(__i386) && !defined(__amd64)
  53         int     rp;
  54 #endif
  55 
  56         ix = *(int *)&x & ~0x80000000;
  57         if (ix > 0x7f800000) /* x is NaN */
  58                 return (x * x);
  59 
  60 #if defined(__i386) && !defined(__amd64)
  61         rp = __swapRP(fp_extended);
  62 #endif
  63         f = (float)erfc((double)x);
  64 #if defined(__i386) && !defined(__amd64)
  65         if (rp != fp_extended)
  66                 (void) __swapRP(rp);
  67 #endif
  68         return (f);
  69 }