js/src/fdlibm/s_copysign.c

   1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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  16  * The Original Code is Mozilla Communicator client code, released
  17  * March 31, 1998.
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  21  * Portions created by the Initial Developer are Copyright (C) 1998
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  39
  40 /* @(#)s_copysign.c 1.3 95/01/18 */
  41 /*
  42  * ====================================================
  43  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  44  *
  45  * Developed at SunSoft, a Sun Microsystems, Inc. business.
  46  * Permission to use, copy, modify, and distribute this
  47  * software is freely granted, provided that this notice
  48  * is preserved.
  49  * ====================================================
  50  */
  51
  52 /*
  53  * copysign(double x, double y)
  54  * copysign(x,y) returns a value with the magnitude of x and
  55  * with the sign bit of y.
  56  */
  57
  58 #include "fdlibm.h"
  59
  60 #ifdef __STDC__
  61         double fd_copysign(double x, double y)
  62 #else
  63         double fd_copysign(x,y)
  64         double x,y;
  65 #endif
  66 {
  67         fd_twoints ux, uy;
  68         ux.d = x; uy.d = y;
  69         __HI(ux) = (__HI(ux)&0x7fffffff)|(__HI(uy)&0x80000000);
  70         x = ux.d;
  71         return x;
  72 }