mirror of
git://projects.qi-hardware.com/eda-tools.git
synced 2024-11-25 17:18:26 +02:00
9cafe23fb8
We now generate the operator map algorithmically, which is a bit less classy than solving the logical equations, but easier to get right. Also renamed the somewhat vague "redundant" to "unreachable".
86 lines
1.5 KiB
C
86 lines
1.5 KiB
C
/*
|
|
* relop.c - 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.
|
|
*/
|
|
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
|
|
#include "relop.h"
|
|
|
|
|
|
/*
|
|
* Operator to use for
|
|
*
|
|
* (A op B) -> forall X: !(X opa A) -> !(X opb B))
|
|
*
|
|
* This is for unlimited sets of values. For limited sets of values, we could
|
|
* decide also in some edge cases, but let's save such sophistication for
|
|
* later.
|
|
*/
|
|
|
|
|
|
static const enum relop unreachable_op[idx_n][idx_n] = {
|
|
#include "unreachable.inc"
|
|
};
|
|
|
|
|
|
static int relop2index(enum relop op)
|
|
{
|
|
switch (op) {
|
|
case rel_lt:
|
|
return idx_lt;
|
|
case rel_le:
|
|
return idx_le;
|
|
case rel_eq:
|
|
return idx_eq;
|
|
case rel_ge:
|
|
return idx_ge;
|
|
case rel_gt:
|
|
return idx_gt;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|
|
|
|
|
|
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)
|
|
{
|
|
return cmp(a,
|
|
unreachable_op[relop2index(opa)][relop2index(opb)], b, user);
|
|
}
|
|
|
|
|
|
void dump_relop(FILE *file, enum relop op)
|
|
{
|
|
switch (op) {
|
|
case rel_lt:
|
|
fprintf(file, "<");
|
|
break;
|
|
case rel_le:
|
|
fprintf(file, "<=");
|
|
break;
|
|
case rel_eq:
|
|
fprintf(file, "=");
|
|
break;
|
|
case rel_ge:
|
|
fprintf(file, ">=");
|
|
break;
|
|
case rel_gt:
|
|
fprintf(file, ">");
|
|
break;
|
|
default:
|
|
abort();
|
|
}
|
|
}
|