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Moved legacy code into archive, ready for a new rapid(?) prototype.

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I may regret doing this!
This commit is contained in:
Simon Brooke 2026-03-24 16:25:09 +00:00
parent 09051a3e63
commit 914c35ead0
114 changed files with 165 additions and 1 deletions
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archive/c/arith/peano.h Normal file
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/*
* peano.h
*
* Basic peano arithmetic
*
* (c) 2017 Simon Brooke <simon@journeyman.cc>
* Licensed under GPL version 2.0, or, at your option, any later version.
*/
#ifndef PEANO_H
#define PEANO_H
#include "memory/consspaceobject.h"
/**
* The maximum value we will allow in an integer cell: one less than 2^60:
* (let ((s (make-string-output-stream)))
* (format s "0x0~XL" (- (expt 2 60) 1))
* (string-downcase (get-output-stream-string s)))
* "0x0fffffffffffffffl"
*
* So left shifting and right shifting by 60 bits is correct.
*/
#define MAX_INTEGER ((__int128_t)0x0fffffffffffffffL)
#define INT_CELL_BASE ((__int128_t)MAX_INTEGER + 1) // ((__int128_t)0x1000000000000000L)
/**
* @brief Number of value bits in an integer cell
*
*/
#define INTEGER_BIT_SHIFT (60)
/**
* @brief return `true` if arg is `nil`, else `false`.
*
* Note that this doesn't really belong in `peano.h`, but after code cleanup it
* was the last thing remaining in either `boolean.c` or `boolean.h`, and it
* wasn't worth keeping two files around for one one-line macro.
*
* @param arg
* @return true if the sole argument is `nil`.
* @return false otherwise.
*/
#define truthy(arg)(!nilp(arg))
bool zerop( struct cons_pointer arg );
struct cons_pointer negative( struct cons_pointer arg );
bool is_negative( struct cons_pointer arg );
struct cons_pointer absolute( struct cons_pointer arg );
long double to_long_double( struct cons_pointer arg );
int64_t to_long_int( struct cons_pointer arg );
struct cons_pointer lisp_absolute( struct stack_frame
*frame, struct cons_pointer frame_pointer, struct
cons_pointer env );
struct cons_pointer
lisp_add( struct stack_frame *frame, struct cons_pointer frame_pointer,
struct cons_pointer env );
struct cons_pointer lisp_is_negative( struct stack_frame
*frame,
struct cons_pointer frame_pointer, struct
cons_pointer env );
struct cons_pointer
lisp_multiply( struct stack_frame *frame,
struct cons_pointer frame_pointer, struct cons_pointer env );
struct cons_pointer negative( struct cons_pointer arg );
struct cons_pointer subtract_2( struct stack_frame *frame,
struct cons_pointer frame_pointer,
struct cons_pointer arg1,
struct cons_pointer arg2 );
struct cons_pointer
lisp_subtract( struct stack_frame *frame,
struct cons_pointer frame_pointer, struct cons_pointer env );
struct cons_pointer
lisp_divide( struct stack_frame *frame, struct cons_pointer frame_pointer,
struct cons_pointer env );
struct cons_pointer lisp_ratio_to_real( struct stack_frame *frame,
struct cons_pointer frame_pointer,
struct cons_pointer env );
#endif /* PEANO_H */