/*
 * relop.h - Relational operators
 *
 * Copyright 2012 by Werner Almesberger
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 */


#ifndef RELOP_H
#define	RELOP_H

#include <stdio.h>


enum relop_idx {
	idx_lt	= 0,
	idx_le	= 1,
	idx_eq	= 2,
	idx_ge	= 3,
	idx_gt	= 4,
	idx_n	= 5
};

enum relop {
	rel_lt	= 1 << idx_lt,
	rel_le	= 1 << idx_le,
	rel_eq	= 1 << idx_eq,
	rel_ge	= 1 << idx_ge,
	rel_gt	= 1 << idx_gt,
};


/*
 * relop_unreachable checks whether, for all X: !(X opb A) -> !(X opa B)
 */

int relop_unreachable(enum relop opa, enum relop opb,
    const void *a, const void *b,
    int (*cmp)(const void *a, enum relop op, const void *b, const void *user),
    const void *user);
void dump_relop(FILE *file, enum relop op);

#endif /* !RELOP_H */