1 | /* Fixed-point arithmetic support. |
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2 | Copyright (C) 2006-2017 Free Software Foundation, Inc. |

3 | |

4 | This file is part of GCC. |

5 | |

6 | GCC is free software; you can redistribute it and/or modify it under |

7 | the terms of the GNU General Public License as published by the Free |

8 | Software Foundation; either version 3, or (at your option) any later |

9 | version. |

10 | |

11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |

12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |

13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |

14 | for more details. |

15 | |

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

17 | along with GCC; see the file COPYING3. If not see |

18 | <http://www.gnu.org/licenses/>. */ |

19 | |

20 | #ifndef GCC_FIXED_VALUE_H |

21 | #define GCC_FIXED_VALUE_H |

22 | |

23 | struct GTY(()) fixed_value |

24 | { |

25 | double_int data; /* Store data up to 2 wide integers. */ |

26 | scalar_mode_pod mode; /* Use machine mode to know IBIT and FBIT. */ |

27 | }; |

28 | |

29 | #define FIXED_VALUE_TYPE struct fixed_value |

30 | |

31 | #define MAX_FCONST0 18 /* For storing 18 fixed-point zeros per |

32 | fract, ufract, accum, and uaccum modes . */ |

33 | #define MAX_FCONST1 8 /* For storing 8 fixed-point ones per accum |

34 | and uaccum modes. */ |

35 | /* Constant fixed-point values 0 and 1. */ |

36 | extern FIXED_VALUE_TYPE fconst0[MAX_FCONST0]; |

37 | extern FIXED_VALUE_TYPE fconst1[MAX_FCONST1]; |

38 | |

39 | /* Macros to access fconst0 and fconst1 via machine modes. */ |

40 | #define FCONST0(mode) fconst0[mode - QQmode] |

41 | #define FCONST1(mode) fconst1[mode - HAmode] |

42 | |

43 | /* Return a CONST_FIXED with value R and mode M. */ |

44 | #define CONST_FIXED_FROM_FIXED_VALUE(r, m) \ |

45 | const_fixed_from_fixed_value (r, m) |

46 | extern rtx const_fixed_from_fixed_value (FIXED_VALUE_TYPE, machine_mode); |

47 | |

48 | /* Construct a FIXED_VALUE from a bit payload and machine mode MODE. |

49 | The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */ |

50 | extern FIXED_VALUE_TYPE fixed_from_double_int (double_int, scalar_mode); |

51 | |

52 | /* Return a CONST_FIXED from a bit payload and machine mode MODE. |

53 | The bits in PAYLOAD are sign-extended/zero-extended according to MODE. */ |

54 | static inline rtx |

55 | const_fixed_from_double_int (double_int payload, |

56 | scalar_mode mode) |

57 | { |

58 | return |

59 | const_fixed_from_fixed_value (fixed_from_double_int (payload, mode), |

60 | mode); |

61 | } |

62 | |

63 | /* Initialize from a decimal or hexadecimal string. */ |

64 | extern void fixed_from_string (FIXED_VALUE_TYPE *, const char *, |

65 | scalar_mode); |

66 | |

67 | /* In tree.c: wrap up a FIXED_VALUE_TYPE in a tree node. */ |

68 | extern tree build_fixed (tree, FIXED_VALUE_TYPE); |

69 | |

70 | /* Extend or truncate to a new mode. */ |

71 | extern bool fixed_convert (FIXED_VALUE_TYPE *, scalar_mode, |

72 | const FIXED_VALUE_TYPE *, bool); |

73 | |

74 | /* Convert to a fixed-point mode from an integer. */ |

75 | extern bool fixed_convert_from_int (FIXED_VALUE_TYPE *, scalar_mode, |

76 | double_int, bool, bool); |

77 | |

78 | /* Convert to a fixed-point mode from a real. */ |

79 | extern bool fixed_convert_from_real (FIXED_VALUE_TYPE *, scalar_mode, |

80 | const REAL_VALUE_TYPE *, bool); |

81 | |

82 | /* Convert to a real mode from a fixed-point. */ |

83 | extern void real_convert_from_fixed (REAL_VALUE_TYPE *, scalar_mode, |

84 | const FIXED_VALUE_TYPE *); |

85 | |

86 | /* Compare two fixed-point objects for bitwise identity. */ |

87 | extern bool fixed_identical (const FIXED_VALUE_TYPE *, const FIXED_VALUE_TYPE *); |

88 | |

89 | /* Calculate a hash value. */ |

90 | extern unsigned int fixed_hash (const FIXED_VALUE_TYPE *); |

91 | |

92 | #define FIXED_VALUES_IDENTICAL(x, y) fixed_identical (&(x), &(y)) |

93 | |

94 | /* Determine whether a fixed-point value X is negative. */ |

95 | #define FIXED_VALUE_NEGATIVE(x) fixed_isneg (&(x)) |

96 | |

97 | /* Render F as a decimal floating point constant. */ |

98 | extern void fixed_to_decimal (char *str, const FIXED_VALUE_TYPE *, size_t); |

99 | |

100 | /* Binary or unary arithmetic on tree_code. */ |

101 | extern bool fixed_arithmetic (FIXED_VALUE_TYPE *, int, const FIXED_VALUE_TYPE *, |

102 | const FIXED_VALUE_TYPE *, bool); |

103 | |

104 | /* Compare fixed-point values by tree_code. */ |

105 | extern bool fixed_compare (int, const FIXED_VALUE_TYPE *, |

106 | const FIXED_VALUE_TYPE *); |

107 | |

108 | /* Determine whether a fixed-point value X is negative. */ |

109 | extern bool fixed_isneg (const FIXED_VALUE_TYPE *); |

110 | |

111 | #endif /* GCC_FIXED_VALUE_H */ |

112 |