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Re: [PATCH 6/9] Add arity-adapting module

From: Andy Wingo
Subject: Re: [PATCH 6/9] Add arity-adapting module
Date: Sat, 31 Aug 2013 09:45:05 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux)

On Fri 30 Aug 2013 00:26, Mark H Weaver <address@hidden> writes:

> address@hidden (Ludovic Courtès) writes:
>> Perhaps that happens in the Tree-IL->CPS pass, but is there/could there
>> be an effect analysis when truncating multiple-value returns?
>> Such that (f (values 1 2 3)) reduces to (f 1).
> I guess this is a question for Andy, but some experimentation suggests
> that this transformation is already done by an earlier optimization pass
> in tree-il.

Yes, I think it's peval that does this.

    scheme@(guile-user)> ,optimize (f (values 1 2 3))
    $1 = (f 1)


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