kc3-lang/libquadmath/math/isnanq.c

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• Hash : 4f659ab9
  Author : Thomas de Grivel
  Date : 2025-11-02T19:33:45
  

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• math/isnanq.c

• /* s_isnanl.c -- long double version of s_isnan.c.
   * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz.
   */
  
  /*
   * ====================================================
   * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   *
   * Developed at SunPro, a Sun Microsystems, Inc. business.
   * Permission to use, copy, modify, and distribute this
   * software is freely granted, provided that this notice
   * is preserved.
   * ====================================================
   */
  
  #if defined(LIBM_SCCS) && !defined(lint)
  static char rcsid[] = "$NetBSD: $";
  #endif
  
  /*
   * isnanq(x) returns 1 is x is nan, else 0;
   * no branching!
   */
  
  #include "quadmath-imp.h"
  
  int isnanq(__float128 x)
  {
  	int64_t hx,lx;
  	GET_FLT128_WORDS64(hx,lx,x);
  	hx &= 0x7fffffffffffffffLL;
  	hx |= (uint64_t)(lx|(-lx))>>63;
  	hx = 0x7fff000000000000LL - hx;
  	return (int)((uint64_t)hx>>63);
  }
  

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