1 | /* Header file for constants used in floating point <-> decimal conversions. |
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2 | Copyright (C) 1995, 1996, 1997, 1998, 1999, 2002, 2003 |

3 | Free Software Foundation, Inc. |

4 | This file is part of the GNU C Library. |

5 | |

6 | The GNU C Library is free software; you can redistribute it and/or |

7 | modify it under the terms of the GNU Lesser General Public |

8 | License as published by the Free Software Foundation; either |

9 | version 2.1 of the License, or (at your option) any later version. |

10 | |

11 | The GNU C Library is distributed in the hope that it will be useful, |

12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |

13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |

14 | Lesser General Public License for more details. |

15 | |

16 | You should have received a copy of the GNU Lesser General Public |

17 | License along with the GNU C Library; if not, write to the Free |

18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |

19 | 02111-1307 USA. */ |

20 | |

21 | #ifndef _FPIOCONST_H |

22 | #define _FPIOCONST_H |

23 | |

24 | #include <float.h> |

25 | #include <math.h> |

26 | |

27 | |

28 | /* These values are used by __printf_fp, where they are noncritical (if the |

29 | value is not large enough, it will just be slower); and by |

30 | strtof/strtod/strtold, where it is critical (it's used for overflow |

31 | detection). |

32 | |

33 | XXX These should be defined in <float.h>. For the time being, we have the |

34 | IEEE754 values here. */ |

35 | |

36 | #define FLT128_MAX_10_EXP_LOG 12 /* = floor(log_2(FLT128_MAX_10_EXP)) */ |

37 | |

38 | /* For strtoq, we need powers of 10 up to floor (log_2 (FLT128_MANT_DIG |

39 | - FLT128_MIN_EXP + 2)). */ |

40 | #if !defined __NO_LONG_DOUBLE_MATH && FLT128_MAX_EXP > 1024 |

41 | # define FPIOCONST_POW10_ARRAY_SIZE 15 |

42 | #else |

43 | # define FPIOCONST_POW10_ARRAY_SIZE 11 |

44 | #endif |

45 | |

46 | |

47 | /* The array with the number representation. */ |

48 | #define __tens __quadmath_tens |

49 | extern const mp_limb_t __tens[] attribute_hidden; |

50 | |

51 | /* Table of powers of ten. This is used by __printf_fp and by |

52 | strtof/strtod/strtold. */ |

53 | struct mp_power |

54 | { |

55 | size_t arrayoff; /* Offset in `__tens'. */ |

56 | mp_size_t arraysize; /* Size of the array. */ |

57 | int p_expo; /* Exponent of the number 10^(2^i). */ |

58 | int m_expo; /* Exponent of the number 10^-(2^i-1). */ |

59 | }; |

60 | #define _fpioconst_pow10 __quadmath_fpioconst_pow10 |

61 | extern const struct mp_power _fpioconst_pow10[FPIOCONST_POW10_ARRAY_SIZE] |

62 | attribute_hidden; |

63 | |

64 | /* The constants in the array `_fpioconst_pow10' have an offset. */ |

65 | #if BITS_PER_MP_LIMB == 32 |

66 | # define _FPIO_CONST_OFFSET 2 |

67 | #else |

68 | # define _FPIO_CONST_OFFSET 1 |

69 | #endif |

70 | |

71 | |

72 | #endif /* fpioconst.h */ |

73 |