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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
/*
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* relop.c - Relational operators
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*
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* Copyright 2012 by Werner Almesberger
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include "relop.h"
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/*
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* Operator to use for
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*
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* (A op B) -> forall X: !(X opa A) -> !(X opb B))
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*
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* This is for unlimited sets of values. For limited sets of values, we could
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* decide also in some edge cases, but let's save such sophistication for
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* later.
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*/
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static const enum relop unreachable_op[idx_n][idx_n] = {
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#include "unreachable.inc"
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};
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static int relop2index(enum relop op)
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{
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switch (op) {
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case rel_lt:
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return idx_lt;
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case rel_le:
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return idx_le;
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case rel_eq:
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return idx_eq;
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case rel_ge:
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return idx_ge;
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case rel_gt:
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return idx_gt;
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default:
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abort();
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}
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}
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int relop_unreachable(enum relop opa, enum relop opb,
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const void *a, const void *b,
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int (*cmp)(const void *a, enum relop op, const void *b, const void *user),
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const void *user)
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{
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return cmp(a,
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unreachable_op[relop2index(opa)][relop2index(opb)], b, user);
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}
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void dump_relop(FILE *file, enum relop op)
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{
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switch (op) {
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case rel_lt:
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fprintf(file, "<");
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break;
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case rel_le:
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fprintf(file, "<=");
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break;
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case rel_eq:
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fprintf(file, "=");
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break;
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case rel_ge:
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fprintf(file, ">=");
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break;
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case rel_gt:
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fprintf(file, ">");
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break;
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default:
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abort();
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}
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}
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