bug#61660: [feature request] optimization of case-lambda

[lloda <lloda@sarc.name>]

> On 27 Feb 2023, at 11:11, Ludovic Courtès <ludo@gnu.org> wrote:
> 
> Hi Daniel,
> 
> lloda <lloda@sarc.name> skribis:
> 
>> From 61ed612fb36108e395bdee4b1bbb46b49ef017b3 Mon Sep 17 00:00:00 2001
>> From: Daniel Llorens <lloda@sarc.name>
>> Date: Thu, 23 Feb 2023 17:38:10 +0100
>> Subject: [PATCH] peval reduces some inlined case-lambda calls
>> 
>> * module/language/tree-il/peval.scm (peval): Reduce multiple case lambda
>>  in <call> trees according to the number of arguments. Do not try to
>>  reduce case-lambda using keyword arguments.
>> * test-suite/tests/peval.test: Tests.
> 
> [...]
> 
>> +++ b/module/language/tree-il/peval.scm
>> @@ -1668,6 +1668,29 @@ top-level bindings from ENV and return the resulting expression."
>> 
>>                   (log 'inline-end result exp)
>>                   result)))))
>> +           (($ <lambda> src-proc meta orig-body)
>> +            ;; If there are multiple cases and one matches nargs, omit all the others.
>> +            (or (and
>> +                 (lambda-case-alternate orig-body)
>> +                 (let ((nargs (length orig-args)))
>> +                   (let loop ((body orig-body))
>> +                     (match body
>> +                       (#f #f) ;; No matching case; an error.
>> +                       (($ <lambda-case> src-case req opt rest kw inits gensyms case-body alt)
>> +                        (cond (kw
>> +                               ;; FIXME: Not handling keyword cases.
>> +                               #f)
> 
> Maybe s/FIXME/XXX/ since it’s at most a limitation, certainly not a bug.
> 
> It LGTM and Andy already approved it on IRC, so go ahead!
> 
> Ludo’.

Apologies for not seeing this earlier. Pushed to 3b47f87618047ebb8812788c64a44877a4f2e0dd. Thanks!

  - Daniel