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Re^2: Perl 5 Compiler, Again!

by rurban (Scribe)
on Sep 20, 2012 at 23:22 UTC ( #994780=note: print w/ replies, xml ) Need Help??


in reply to Re: Perl 5 Compiler, Again!
in thread Perl 5 Compiler, Again!

flexvault:

There is an integrated compiler in perl5. And there are external compilers.

You will not easily see what the integrated compiler in perl5 does, but you see some result with B::Concise. All the ex-OPs there are optimized out already.

$ perl -MO=Concise -e'1+1' 3 <@> leave[1 ref] vKP/REFC ->(end) 1 <0> enter ->2 2 <;> nextstate(main 1 -e:1) v:{ ->3 - <0> ex-const v ->3
E.g. 1=1 was constant folded here.
$ perl -MO=Concise -e'$a=1+$a' 8 <@> leave[1 ref] vKP/REFC ->(end) 1 <0> enter ->2 2 <;> nextstate(main 1 -e:1) v:{ ->3 7 <2> sassign vKS/2 ->8 5 <2> add[t1] sK/2 ->6 3 <$> const(IV 1) s ->4 - <1> ex-rv2sv sK/1 ->5 4 <$> gvsv(*a) s ->5 - <1> ex-rv2sv sKRM*/1 ->7 6 <$> gvsv(*a) s ->7
All the sv references rv2sv were optimized to direct gvsv accesses.

perlcc is the backend for 3 external compilers.


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