Worked fine with wantarray(). Thanks for the hint. Here is the final code :

## Wonderful catch-all
sub AUTOLOAD {
    # Input variables
    my ($instance_ref) = shift(@_) ;

    # Internal vars
    $tries = 0 ;
    my $wantarray = wantarray() ;

    # Determine initially called sub
    my $command = $AUTOLOAD ;
    
    # Format it to call corresponding method on Redis package
    $command =~ s/.*:// ;
    $command = 'SUPER::' . $command ;
    
    TRY:while($tries < $maxtries) {
        # Array
        $errorcode = eval {@result_array = $instance_ref->$command(@_)
+}
            if(defined($wantarray) && $wantarray) ;
        # Scalar
        $errorcode = eval {$result_scalar = $instance_ref->$command(@_
+)}
            if(defined($wantarray) && !$wantarray) ;
        # Scalar
        $errorcode = eval {$instance_ref->$command(@_)}
            if(!defined($wantarray)) ;
        
        # Did it went well ?
        if(!defined($errorcode) && $@ ne '') {
            # No - log something ?
            warn("Could not send command $command to Redis server, try
+ $tries on $maxtries, reason : $@") ;
            
            # Update count
            $tries++ ;
            
            # Wait a little bit
            sleep(1) ;
            
            # Go back to work
            next TRY;
            }
            
        # Otherwise that's cool
        last TRY;            
        }


    # Return data
    return @result_array
        if(defined($wantarray) && $wantarray) ;
    return $result_scalar
        if(defined($wantarray) && !$wantarray) ;
    return
        if(!defined($wantarray)) ;        
    }
[download]

Thanks for your help.