tilly posed the same question on p5p. That  goto &sub is slow is a known issue at perl5porters. And in a subsequent message , it was claimed that "the C<goto &NAME> construct is not for tail recursion, but is for fooling the C<caller> function. ". I think someone also claimed that goto LABEL does not have the speed penalty of  goto &sub. A further message notes that some memory leaks associated with  goto &sub are cleaned up in 5.8.1.

This does not answer your question: why is  goto &sub slow? I don't know a definitive answer, but I gather it takes time to rearrange the stack and clean up the lexical pad before jumping to the new routine.

-Mark

In reply to Re: Why is goto &sub slow? by kvale
in thread Why is goto &sub slow? by Ovid

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