Store the registers as keys in a hash of hashes, use the values as the inner keys. After the file has been processed, iterate over the registers and count how many keys the inner hashes have. Those with a single key are the constant registers. 
#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

my %R;
while (<<>>) {
    chomp;
    my ($register, $value) = split /,\s*/;
    ++$R{$register}{$value}
}
for my $register (keys %R) {
    say $register, "\t",
        keys %{ $R{$register} } > 1 ? 'variable' : 'constant';
}

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map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

In reply to Re: finding the varaible quantity and static quantity from comma separated data and values by choroba
in thread finding the varaible quantity and static quantity from comma separated data and values by ankityad

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