mirror of
https://github.com/Mercury-Language/mercury.git
synced 2026-04-17 02:13:54 +00:00
0d3fcbaae3
library/*.m:
Delete Erlang foreign code and foreign types.
Delete documentation specific to Erlang targets.
library/deconstruct.m:
Add pragma no_determinism_warning to allow functor_number_cc/3
to compile for now.
library/Mercury.options:
Delete workaround only needed when targetting Erlang.
browser/listing.m:
mdbcomp/rtti_access.m:
Delete Erlang foreign code and foreign types.
789 lines
18 KiB
Mathematica
789 lines
18 KiB
Mathematica
%---------------------------------------------------------------------------%
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% vim: ts=4 sw=4 et ft=mercury
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%---------------------------------------------------------------------------%
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% Copyright (C) 2017-2018 The Mercury team.
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% This file is distributed under the terms specified in COPYING.LIB.
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%---------------------------------------------------------------------------%
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%
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% File: uint8.m
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% Main author: juliensf
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% Stability: low.
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%
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% Predicates and functions for dealing with unsigned 8-bit integer numbers.
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%
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%---------------------------------------------------------------------------%
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:- module uint8.
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:- interface.
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:- import_module pretty_printer.
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%---------------------------------------------------------------------------%
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%
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% Conversion from int.
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%
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% from_int(I, U8):
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%
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% Convert an int to a uint8.
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% Fails if I is not in [0, 2^8 - 1].
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%
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:- pred from_int(int::in, uint8::out) is semidet.
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% det_from_int(I) = U8:
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%
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% Convert an int to a uint8.
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% Throws an exception if I is not in [0, 2^8 - 1].
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%
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:- func det_from_int(int) = uint8.
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% cast_from_int(I) = U8:
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%
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% Convert an int to a uint8.
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% Always succeeds, but will yield a result that is mathematically equal
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% to I only if I is in [0, 2^8 - 1].
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%
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:- func cast_from_int(int) = uint8.
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%---------------------------------------------------------------------------%
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%
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% Conversion to int.
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%
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% to_int(U8) = I:
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%
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% Convert a uint8 to an int.
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% Always succeeds, and yields a result that is mathematically equal
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% to U8.
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%
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:- func to_int(uint8) = int.
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% cast_to_int(U8) = I:
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%
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% Convert a uint8 to an int.
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% Always succeeds, and yields a result that is mathematically equal
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% to U8.
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%
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:- func cast_to_int(uint8) = int.
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%---------------------------------------------------------------------------%
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%
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% Conversion to uint.
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%
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% cast_to_uint(U8) = U:
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%
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% Convert a uint8 to a uint.
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% Always succeeds, and yields a result that is mathematically equal
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% to U8.
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%
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:- func cast_to_uint(uint8) = uint.
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%---------------------------------------------------------------------------%
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%
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% Change of signedness.
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%
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% cast_from_int8(I8) = U8:
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%
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% Convert an int8 to a uint8. This will yield a result that is
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% mathematically equal to I8 only if I8 is in [0, 2^7 - 1].
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%
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:- func cast_from_int8(int8) = uint8.
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%---------------------------------------------------------------------------%
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%
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% Comparisons and related operations.
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%
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% Less than.
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%
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:- pred (uint8::in) < (uint8::in) is semidet.
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% Greater than.
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%
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:- pred (uint8::in) > (uint8::in) is semidet.
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% Less than or equal.
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%
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:- pred (uint8::in) =< (uint8::in) is semidet.
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% Greater than or equal.
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%
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:- pred (uint8::in) >= (uint8::in) is semidet.
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% Maximum.
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%
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:- func max(uint8, uint8) = uint8.
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% Minimum.
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%
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:- func min(uint8, uint8) = uint8.
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%---------------------------------------------------------------------------%
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%
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% Arithmetic operations.
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%
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% Addition.
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%
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:- func uint8 + uint8 = uint8.
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:- mode in + in = uo is det.
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:- mode uo + in = in is det.
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:- mode in + uo = in is det.
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:- func plus(uint8, uint8) = uint8.
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% Subtraction.
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%
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:- func uint8 - uint8 = uint8.
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:- mode in - in = uo is det.
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:- mode uo - in = in is det.
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:- mode in - uo = in is det.
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:- func minus(uint8, uint8) = uint8.
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% Multiplication.
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%
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:- func (uint8::in) * (uint8::in) = (uint8::uo) is det.
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:- func times(uint8, uint8) = uint8.
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% Truncating integer division.
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%
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% Throws a `domain_error' exception if the right operand is zero.
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%
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:- func (uint8::in) div (uint8::in) = (uint8::uo) is det.
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% Truncating integer division.
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%
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% Throws a `domain_error' exception if the right operand is zero.
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%
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:- func (uint8::in) // (uint8::in) = (uint8::uo) is det.
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% (/)/2 is a synonym for (//)/2.
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%
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:- func (uint8::in) / (uint8::in) = (uint8::uo) is det.
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% unchecked_quotient(X, Y) is the same as X // Y, but the behaviour
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% is undefined if the right operand is zero.
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%
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:- func unchecked_quotient(uint8::in, uint8::in) = (uint8::uo) is det.
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% Modulus.
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% X mod Y = X - (X div Y) * Y
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%
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% Throws a `domain_error' exception if the right operand is zero.
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%
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:- func (uint8::in) mod (uint8::in) = (uint8::uo) is det.
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% Remainder.
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% X rem Y = X - (X // Y) * Y.
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%
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% Throws a `domain_error/` exception if the right operand is zero.
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%
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:- func (uint8::in) rem (uint8::in) = (uint8::uo) is det.
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% unchecked_rem(X, Y) is the same as X rem Y, but the behaviour is
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% undefined if the right operand is zero.
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%
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:- func unchecked_rem(uint8::in, uint8::in) = (uint8::uo) is det.
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% even(X) is equivalent to (X mod 2u8 = 0u8).
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%
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:- pred even(uint8::in) is semidet.
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% odd(X) is equivalent to (not even(X)), i.e. (X mod 2u8 = 1u8).
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%
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:- pred odd(uint8::in) is semidet.
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%---------------------------------------------------------------------------%
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%
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% Shift operations.
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%
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% Left shift.
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% X << Y returns X "left shifted" by Y bits.
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% The bit positions vacated by the shift are filled by zeros.
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% Throws an exception if Y is not in [0, 8).
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%
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:- func (uint8::in) << (int::in) = (uint8::uo) is det.
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% unchecked_left_shift(X, Y) is the same as X << Y except that the
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% behaviour is undefined if Y is not in [0, 8).
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% It will typically be implemented more efficiently than X << Y.
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%
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:- func unchecked_left_shift(uint8::in, int::in) = (uint8::uo) is det.
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% Right shift.
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% X >> Y returns X "right shifted" by Y bits.
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% The bit positions vacated by the shift are filled by zeros.
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% Throws an exception if Y is not in [0, 8).
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%
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:- func (uint8::in) >> (int::in) = (uint8::uo) is det.
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% unchecked_right_shift(X, Y) is the same as X >> Y except that the
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% behaviour is undefined if Y is not in [0, 8).
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% It will typically be implemented more efficiently than X >> Y.
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%
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:- func unchecked_right_shift(uint8::in, int::in) = (uint8::uo) is det.
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%---------------------------------------------------------------------------%
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%
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% Logical operations.
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%
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% Bitwise and.
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%
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:- func (uint8::in) /\ (uint8::in) = (uint8::uo) is det.
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% Bitwise or.
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%
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:- func (uint8::in) \/ (uint8::in) = (uint8::uo) is det.
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% Bitwise exclusive or (xor).
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%
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:- func xor(uint8, uint8) = uint8.
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:- mode xor(in, in) = uo is det.
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:- mode xor(in, uo) = in is det.
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:- mode xor(uo, in) = in is det.
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% Bitwise complement.
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%
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:- func \ (uint8::in) = (uint8::uo) is det.
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%---------------------------------------------------------------------------%
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%
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% Operations on bits and bytes.
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%
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% num_zeros(U) = N:
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%
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% N is the number of zeros in the binary representation of U.
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%
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:- func num_zeros(uint8) = int.
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% num_ones(U) = N:
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%
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% N is the number of ones in the binary representation of U.
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%
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:- func num_ones(uint8) = int.
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% num_leading_zeros(U) = N:
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%
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% N is the number of leading zeros in the binary representation of U,
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% starting at the most significant bit position.
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% Note that num_leading_zeros(0u8) = 8.
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%
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:- func num_leading_zeros(uint8) = int.
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% num_trailing_zeros(U) = N:
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%
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% N is the number of trailing zeros in the binary representation of U,
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% starting at the least significant bit position.
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% Note that num_trailing_zeros(0u8) = 8.
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%
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:- func num_trailing_zeros(uint8) = int.
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% reverse_bits(A) = B:
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%
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% B is the is value that results from reversing the bits in the binary
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% representation of A.
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%
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:- func reverse_bits(uint8) = uint8.
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%---------------------------------------------------------------------------%
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%
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% Limits.
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%
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:- func max_uint8 = uint8.
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%---------------------------------------------------------------------------%
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%
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% Prettyprinting.
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%
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% Convert an uint8 to a pretty_printer.doc for formatting.
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%
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:- func uint8_to_doc(uint8) = pretty_printer.doc.
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%---------------------------------------------------------------------------%
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%---------------------------------------------------------------------------%
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:- implementation.
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:- import_module exception.
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:- import_module int.
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:- import_module require.
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:- import_module string.
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:- import_module uint.
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%---------------------------------------------------------------------------%
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from_int(I, U8) :-
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I >= 0,
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I =< 255,
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U8 = cast_from_int(I).
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det_from_int(I) = U8 :-
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( if from_int(I, U8Prime) then
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U8 = U8Prime
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else
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error($pred, "cannot convert int to uint8")
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).
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:- pragma foreign_proc("C",
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cast_from_int(I::in) = (U8::out),
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[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail,
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does_not_affect_liveness],
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"
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U8 = (uint8_t) I;
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").
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:- pragma foreign_proc("C#",
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cast_from_int(I::in) = (U8::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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U8 = (byte) I;
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").
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:- pragma foreign_proc("Java",
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cast_from_int(I::in) = (U8::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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U8 = (byte) I;
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").
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%---------------------------------------------------------------------------%
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:- pragma foreign_proc("C",
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to_int(U8::in) = (I::out),
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[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail,
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does_not_affect_liveness],
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"
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I = U8;
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").
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:- pragma foreign_proc("C#",
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to_int(U8::in) = (I::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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I = U8;
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").
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:- pragma foreign_proc("Java",
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to_int(U8::in) = (I::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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I = U8 & 0xff;
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").
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:- pragma foreign_proc("C",
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cast_to_int(U8::in) = (I::out),
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[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail,
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does_not_affect_liveness],
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"
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I = U8;
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").
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:- pragma foreign_proc("C#",
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cast_to_int(U8::in) = (I::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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I = U8;
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").
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:- pragma foreign_proc("Java",
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cast_to_int(U8::in) = (I::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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I = U8 & 0xff;
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").
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%---------------------------------------------------------------------------%
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:- pragma foreign_proc("C",
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cast_to_uint(U8::in) = (U::out),
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[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail,
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does_not_affect_liveness],
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"
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U = (MR_Unsigned) U8;
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").
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:- pragma foreign_proc("C#",
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cast_to_uint(U8::in) = (U::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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U = (uint) U8;
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").
|
|
|
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:- pragma foreign_proc("Java",
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cast_to_uint(U8::in) = (U::out),
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[will_not_call_mercury, promise_pure, thread_safe],
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"
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U = U8 & 0xff;
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").
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%---------------------------------------------------------------------------%
|
|
|
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:- pragma foreign_proc("C",
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cast_from_int8(I8::in) = (U8::out),
|
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[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail,
|
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does_not_affect_liveness],
|
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"
|
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U8 = (uint8_t) I8;
|
|
").
|
|
|
|
:- pragma foreign_proc("C#",
|
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cast_from_int8(I8::in) = (U8::out),
|
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[will_not_call_mercury, promise_pure, thread_safe],
|
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"
|
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U8 = (byte) I8;
|
|
").
|
|
|
|
:- pragma foreign_proc("Java",
|
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cast_from_int8(I8::in) = (U8::out),
|
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[will_not_call_mercury, promise_pure, thread_safe],
|
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"
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U8 = I8;
|
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").
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
% The comparison operations <, >, =< and >= are builtins.
|
|
|
|
max(X, Y) =
|
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( if X > Y then X else Y ).
|
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|
|
min(X, Y) =
|
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( if X < Y then X else Y ).
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
% The operations +, -, plus, minus, *, and times are builtins.
|
|
|
|
X div Y = X // Y.
|
|
|
|
:- pragma inline('//'/2).
|
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X // Y = Div :-
|
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( if Y = 0u8 then
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throw(domain_error("uint8.'//': division by zero"))
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else
|
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Div = unchecked_quotient(X, Y)
|
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).
|
|
|
|
:- pragma inline('/'/2).
|
|
X / Y = X // Y.
|
|
|
|
X mod Y = X rem Y.
|
|
|
|
:- pragma inline(rem/2).
|
|
X rem Y = Rem :-
|
|
( if Y = 0u8 then
|
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throw(domain_error("uint8.rem: division by zero"))
|
|
else
|
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Rem = unchecked_rem(X, Y)
|
|
).
|
|
|
|
:- pragma inline(even/1).
|
|
even(X) :-
|
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(X /\ 1u8) = 0u8.
|
|
|
|
:- pragma inline(odd/1).
|
|
odd(X) :-
|
|
(X /\ 1u8) \= 0u8.
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
% The operations unchecked_left_shift and unchecked_right_shift are builtins.
|
|
|
|
X << Y = Result :-
|
|
( if cast_from_int(Y) < 8u then
|
|
Result = unchecked_left_shift(X, Y)
|
|
else
|
|
Msg = "uint8.(<<): second operand is out of range",
|
|
throw(domain_error(Msg))
|
|
).
|
|
|
|
X >> Y = Result :-
|
|
( if cast_from_int(Y) < 8u then
|
|
Result = unchecked_right_shift(X, Y)
|
|
else
|
|
Msg = "uint8.(>>): second operand is out of range",
|
|
throw(domain_error(Msg))
|
|
).
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
num_zeros(U) = 8 - num_ones(U).
|
|
|
|
:- pragma foreign_decl("C", "
|
|
extern const uint8_t ML_uint8_num_ones_table[];
|
|
").
|
|
|
|
:- pragma foreign_code("C", "
|
|
const uint8_t ML_uint8_num_ones_table[256] = {
|
|
0,1,1,2,1,2,2,3,
|
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1,2,2,3,2,3,3,4,
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1,2,2,3,2,3,3,4,
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2,3,3,4,3,4,4,5,
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1,2,2,3,2,3,3,4,
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2,3,3,4,3,4,4,5,
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2,3,3,4,3,4,4,5,
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3,4,4,5,4,5,5,6,
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1,2,2,3,2,3,3,4,
|
|
2,3,3,4,3,4,4,5,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
3,4,4,5,4,5,5,6,
|
|
4,5,5,6,5,6,6,7,
|
|
1,2,2,3,2,3,3,4,
|
|
2,3,3,4,3,4,4,5,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
3,4,4,5,4,5,5,6,
|
|
4,5,5,6,5,6,6,7,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
3,4,4,5,4,5,5,6,
|
|
4,5,5,6,5,6,6,7,
|
|
3,4,4,5,4,5,5,6,
|
|
4,5,5,6,5,6,6,7,
|
|
4,5,5,6,5,6,6,7,
|
|
5,6,6,7,6,7,7,8
|
|
};
|
|
").
|
|
|
|
:- pragma foreign_code("C#", "
|
|
public static byte[] num_ones_table = {
|
|
0,1,1,2,1,2,2,3,
|
|
1,2,2,3,2,3,3,4,
|
|
1,2,2,3,2,3,3,4,
|
|
2,3,3,4,3,4,4,5,
|
|
1,2,2,3,2,3,3,4,
|
|
2,3,3,4,3,4,4,5,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
1,2,2,3,2,3,3,4,
|
|
2,3,3,4,3,4,4,5,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
3,4,4,5,4,5,5,6,
|
|
4,5,5,6,5,6,6,7,
|
|
1,2,2,3,2,3,3,4,
|
|
2,3,3,4,3,4,4,5,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
3,4,4,5,4,5,5,6,
|
|
4,5,5,6,5,6,6,7,
|
|
2,3,3,4,3,4,4,5,
|
|
3,4,4,5,4,5,5,6,
|
|
3,4,4,5,4,5,5,6,
|
|
4,5,5,6,5,6,6,7,
|
|
3,4,4,5,4,5,5,6,
|
|
4,5,5,6,5,6,6,7,
|
|
4,5,5,6,5,6,6,7,
|
|
5,6,6,7,6,7,7,8
|
|
};
|
|
|
|
").
|
|
|
|
:- pragma foreign_proc("C",
|
|
num_ones(U::in) = (N::out),
|
|
[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail],
|
|
"
|
|
N = ML_uint8_num_ones_table[U];
|
|
").
|
|
|
|
:- pragma foreign_proc("C#",
|
|
num_ones(U::in) = (N::out),
|
|
[will_not_call_mercury, promise_pure, thread_safe],
|
|
"
|
|
N = mercury.uint8.num_ones_table[U];
|
|
").
|
|
|
|
:- pragma foreign_proc("Java",
|
|
num_ones(U::in) = (N::out),
|
|
[will_not_call_mercury, promise_pure, thread_safe],
|
|
"
|
|
N = java.lang.Integer.bitCount(U << 24);
|
|
").
|
|
|
|
%---------------------%
|
|
|
|
:- pragma foreign_decl("C", "
|
|
extern const uint8_t ML_uint8_nlz_table[];
|
|
").
|
|
|
|
:- pragma foreign_code("C", "
|
|
const uint8_t ML_uint8_nlz_table[256] = {
|
|
8,7,6,6,5,5,5,5,
|
|
4,4,4,4,4,4,4,4,
|
|
3,3,3,3,3,3,3,3,
|
|
3,3,3,3,3,3,3,3,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0
|
|
};
|
|
|
|
").
|
|
|
|
:- pragma foreign_code("C#", "
|
|
public static byte[] nlz_table = {
|
|
8,7,6,6,5,5,5,5,
|
|
4,4,4,4,4,4,4,4,
|
|
3,3,3,3,3,3,3,3,
|
|
3,3,3,3,3,3,3,3,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0
|
|
};
|
|
|
|
").
|
|
|
|
:- pragma foreign_code("Java", "
|
|
public static byte[] nlz_table = {
|
|
8,7,6,6,5,5,5,5,
|
|
4,4,4,4,4,4,4,4,
|
|
3,3,3,3,3,3,3,3,
|
|
3,3,3,3,3,3,3,3,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
2,2,2,2,2,2,2,2,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
1,1,1,1,1,1,1,1,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0,
|
|
0,0,0,0,0,0,0,0
|
|
};
|
|
").
|
|
|
|
:- pragma foreign_proc("C",
|
|
num_leading_zeros(I::in) = (N::out),
|
|
[will_not_call_mercury, promise_pure, thread_safe, will_not_modify_trail],
|
|
"
|
|
N = ML_uint8_nlz_table[I];
|
|
").
|
|
|
|
:- pragma foreign_proc("C#",
|
|
num_leading_zeros(U::in) = (N::out),
|
|
[will_not_call_mercury, promise_pure, thread_safe],
|
|
"
|
|
N = mercury.uint8.nlz_table[U];
|
|
").
|
|
|
|
:- pragma foreign_proc("Java",
|
|
num_leading_zeros(U::in) = (N::out),
|
|
[will_not_call_mercury, promise_pure, thread_safe],
|
|
"
|
|
N = jmercury.uint8.nlz_table[U & 0xff];
|
|
").
|
|
|
|
num_trailing_zeros(U) =
|
|
8 - num_leading_zeros(\ U /\ (U - 1u8)).
|
|
|
|
%---------------------%
|
|
|
|
:- pragma foreign_proc("Java",
|
|
reverse_bits(A::in) = (B::out),
|
|
[will_not_call_mercury, promise_pure, thread_safe],
|
|
"
|
|
B = (byte) (java.lang.Integer.reverse(A << 24) & 0xff);
|
|
").
|
|
|
|
reverse_bits(!.A) = B :-
|
|
!:A = ((!.A /\ 0xf0_u8) >> 4) \/ ((!.A /\ 0x0f_u8) << 4),
|
|
!:A = ((!.A /\ 0xcc_u8) >> 2) \/ ((!.A /\ 0x33_u8) << 2),
|
|
!:A = ((!.A /\ 0xaa_u8) >> 1) \/ ((!.A /\ 0x55_u8) << 1),
|
|
B = !.A.
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
max_uint8 = 255_u8.
|
|
|
|
%---------------------------------------------------------------------------%
|
|
|
|
uint8_to_doc(X) = str(string.uint8_to_string(X)).
|
|
|
|
%---------------------------------------------------------------------------%
|
|
:- end_module uint8.
|
|
%---------------------------------------------------------------------------%
|