Create &B::{IV,PV}::as_string using typeglob assignment rather than goto &

Typeglob assignment avoids compiler work creating the optree for a second
subroutine, and runtime work executing that optree.

diff --git a/ext/B/B.pm b/ext/B/B.pm
index 4cd5545..587b809 100644 (file)
--- a/ext/B/B.pm
+++ b/ext/B/B.pm
@@ -105,8 +105,8 @@ sub B::IV::int_value {
 }
 
 sub B::NULL::as_string() {""}
-sub B::IV::as_string()   {goto &B::IV::int_value}
-sub B::PV::as_string()   {goto &B::PV::PV}
+*B::IV::as_string = \&B::IV::int_value;
+*B::PV::as_string = \&B::PV::PV;
 
 my $debug;
 my $op_count = 0;