mirror of
git://projects.qi-hardware.com/eda-tools.git
synced 2024-11-04 23:05:21 +02:00
72 lines
1.5 KiB
Perl
72 lines
1.5 KiB
Perl
|
#!/usr/bin/perl
|
||
|
|
#
|
||
|
|
# genredmap.pl - Redundacy detector map generator
|
||
|
|
#
|
||
|
|
# 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.
|
||
|
|
#
|
||
|
|
|
||
|
|
#
|
||
|
|
# This script finds the relational operators op = f(opa, opb), for which
|
||
|
|
# the following is true:
|
||
|
|
#
|
||
|
|
# forall A, B: (A op B) -> forall X: !(X opa A) -> !(X opa B)
|
||
|
|
#
|
||
|
|
# In other words: if, with X a variable and A and B constants, we have a
|
||
|
|
# cascade of the form
|
||
|
|
#
|
||
|
|
# if (X opa A) ...;
|
||
|
|
# else if (X opa B) ...;
|
||
|
|
#
|
||
|
|
# and A op B is true, then the second branch will never be taken.
|
||
|
|
#
|
||
|
|
|
||
|
|
%op = (
|
||
|
|
"lt" => sub { $_[0] < $_[1] },
|
||
|
|
"le" => sub { $_[0] <= $_[1] },
|
||
|
|
"eq" => sub { $_[0] == $_[1] },
|
||
|
|
"ge" => sub { $_[0] >= $_[1] },
|
||
|
|
"gt" => sub { $_[0] > $_[1] },
|
||
|
|
|
||
|
|
);
|
||
|
|
|
||
|
|
@ops = ("lt", "le", "eq", "ge", "gt");
|
||
|
|
|
||
|
|
$always = 0;
|
||
|
|
|
||
|
|
$a = 2;
|
||
|
|
@v = (0, 1, 2, 3, 4);
|
||
|
|
|
||
|
|
for $opa (@ops) {
|
||
|
|
#next unless $opa eq "lt";
|
||
|
|
for $opb (@ops) {
|
||
|
|
#next unless $opb eq "lt";
|
||
|
|
$best = 0;
|
||
|
|
OP: for $op (@ops) {
|
||
|
|
$hit = 0;
|
||
|
|
for $b (@v) {
|
||
|
|
#print "($opa, $opb) $a $op $b\n";
|
||
|
|
next unless $op{$op}->($a, $b);
|
||
|
|
for $x (@v) {
|
||
|
|
#print " A: $x $opa $a\n";
|
||
|
|
next if $op{$opa}->($x, $a);
|
||
|
|
#print " B: $x $opb $b\n";
|
||
|
|
next OP
|
||
|
|
if $op{$opb}->($x, $b) != $always;
|
||
|
|
$hit++;
|
||
|
|
#print " HIT ($hit)\n";
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ($hit > $best) {
|
||
|
|
$best = $hit;
|
||
|
|
$best_op = $op;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
print "\t[idx_$opa][idx_$opb] = rel_$best_op,\n" if $best;
|
||
|
|
}
|
||
|
|
}
|