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path: root/n/asserv/src/dsp_check.pl
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#!/usr/bin/perl -w
use strict;
use POSIX qw(floor);

my $fail = 0;

sub check_mul
{
    my ($a, $b, $r) = @_;
    $b = $b / 256;
    my $m = floor ($a * $b);
    if ($m > (1 << 15) - 1 || $m < -(1 << 15))
    {
	print "overflow $a * $b = $r ($m)\n";
    }
    elsif ($m == $r)
    {
	print "pass $a * $b = $r\n";
    }
    else
    {
	print "fail $a * $b = $r ($m)\n";
	$fail = 1;
    }
}

while (<>)
{
    chomp;
    if (/^m (-?\d+) (\d+)$/)
    {
	my ($a, $b) = ($1, $2);
	$_ = <>; chomp;
	next unless (/^r (-?\d+)$/);
	my $r = $1;
	$_ = <>; chomp;
	next unless (/^R (-?\d+)$/);
	my $R = $1;
	check_mul $a, $b, $r;
	check_mul -$a, $b, $R;
    }
}

if ($fail)
{
    print "test failled\n";
    exit 1;
}
else
{
    print "test passed\n";
    exit 0;
}