[PATCH 09/13] nntp: smsg_range_i: favor ->{$field} lookups when possible

[Eric Wong <e@yhbt.net>]

PublicInbox::Smsg::date remains the only exception which
requires any subroutine calls, here, so we'll just have
a branch just for that.
---
 lib/PublicInbox/NNTP.pm | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 54207500dd8..a37910d1739 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -722,8 +722,16 @@ sub smsg_range_i {
 	my $msgs = $over->query_xover($$beg, $end);
 	scalar(@$msgs) or return;
 	my $tmp = '';
-	foreach my $s (@$msgs) {
-		$tmp .= $s->{num} . ' ' . $s->$field . "\r\n";
+
+	# ->{$field} is faster than ->$field invocations, so favor that.
+	if ($field eq 'date') {
+		for my $s (@$msgs) {
+			$tmp .= "$s->{num} ".PublicInbox::Smsg::date($s)."\r\n"
+		}
+	} else {
+		for my $s (@$msgs) {
+			$tmp .= "$s->{num} $s->{$field}\r\n";
+		}
 	}
 	utf8::encode($tmp);
 	$self->msg_more($tmp);