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72 lines
1.5 KiB
Perl
72 lines
1.5 KiB
Perl
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#!/usr/bin/perl
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#
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# genredmap.pl - Redundacy detector map generator
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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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#
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# This script finds the relational operators op = f(opa, opb), for which
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# the following is true:
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#
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# forall A, B: (A op B) -> forall X: !(X opa A) -> !(X opa B)
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#
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# In other words: if, with X a variable and A and B constants, we have a
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# cascade of the form
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#
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# if (X opa A) ...;
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# else if (X opa B) ...;
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#
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# and A op B is true, then the second branch will never be taken.
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#
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%op = (
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"lt" => sub { $_[0] < $_[1] },
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"le" => sub { $_[0] <= $_[1] },
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"eq" => sub { $_[0] == $_[1] },
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"ge" => sub { $_[0] >= $_[1] },
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"gt" => sub { $_[0] > $_[1] },
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);
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@ops = ("lt", "le", "eq", "ge", "gt");
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$always = 0;
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$a = 2;
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@v = (0, 1, 2, 3, 4);
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for $opa (@ops) {
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#next unless $opa eq "lt";
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for $opb (@ops) {
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#next unless $opb eq "lt";
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$best = 0;
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OP: for $op (@ops) {
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$hit = 0;
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for $b (@v) {
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#print "($opa, $opb) $a $op $b\n";
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next unless $op{$op}->($a, $b);
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for $x (@v) {
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#print " A: $x $opa $a\n";
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next if $op{$opa}->($x, $a);
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#print " B: $x $opb $b\n";
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next OP
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if $op{$opb}->($x, $b) != $always;
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$hit++;
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#print " HIT ($hit)\n";
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}
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}
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if ($hit > $best) {
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$best = $hit;
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$best_op = $op;
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}
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}
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print "\t[idx_$opa][idx_$opb] = rel_$best_op,\n" if $best;
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}
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}
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