mathdef.h 2.0 KB

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  1. /* Copyright (C) 2001, 2004 Free Software Foundation, Inc.
  2. This file is part of the GNU C Library.
  3. The GNU C Library is free software; you can redistribute it and/or
  4. modify it under the terms of the GNU Lesser General Public
  5. License as published by the Free Software Foundation; either
  6. version 2.1 of the License, or (at your option) any later version.
  7. The GNU C Library is distributed in the hope that it will be useful,
  8. but WITHOUT ANY WARRANTY; without even the implied warranty of
  9. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  10. Lesser General Public License for more details.
  11. You should have received a copy of the GNU Lesser General Public
  12. License along with the GNU C Library; if not, write to the Free
  13. Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  14. 02111-1307 USA. */
  15. #if !defined _MATH_H && !defined _COMPLEX_H
  16. # error "Never use <bits/mathdef.h> directly; include <math.h> instead"
  17. #endif
  18. #if defined __USE_ISOC99 && defined _MATH_H && !defined _MATH_H_MATHDEF
  19. # define _MATH_H_MATHDEF 1
  20. # include <bits/wordsize.h>
  21. # if __WORDSIZE == 64 || (defined __FLT_EVAL_METHOD__ && __FLT_EVAL_METHOD__ == 0)
  22. /* The x86-64 architecture computes values with the precission of the
  23. used type. Similarly for -m32 -mfpmath=sse. */
  24. typedef float float_t; /* `float' expressions are evaluated as `float'. */
  25. typedef double double_t; /* `double' expressions are evaluated
  26. as `double'. */
  27. # else
  28. /* The ix87 FPUs evaluate all values in the 80 bit floating-point format
  29. which is also available for the user as `long double'. Therefore we
  30. define: */
  31. typedef long double float_t; /* `float' expressions are evaluated as
  32. `long double'. */
  33. typedef long double double_t; /* `double' expressions are evaluated as
  34. `long double'. */
  35. # endif
  36. /* The values returned by `ilogb' for 0 and NaN respectively. */
  37. # define FP_ILOGB0 (-2147483647 - 1)
  38. # define FP_ILOGBNAN (-2147483647 - 1)
  39. #endif /* ISO C99 */