#420: Add ability to optimize function calls with lambda in function position. Use it to optimize jss ------------------------------+-------------------------- Reporter: mevenson | Owner: Type: enhancement | Status: new Priority: major | Milestone: 1.5.0 Component: compiler | Version: 1.5.0-dev Resolution: | Keywords: github-issue Parent Tickets: | ------------------------------+-------------------------- Description changed by mevenson:

Old description:

Precompiler: When compiling a form with a lambda in the function position, possibly optimize it

Case 1: If the lambda has a single form in it, let someone define a transform using:

define-function-position-lambda-transform (body-function-name (arglist form args) &body body)

body-function-name is the car of the single form in the lambda arglist is the arglist of the lambda form is the single form within the lambda args are the arguments to which the lambda will be defined.

The function should check whether it can do a transform, and do it if so, otherwise return nil signalling it couldn't

Case 2: If case 1 is not successful then if the arglist is a simple one (no &key, &rest, &optional) then do a standard beta-reduction binding the args to arglist using let (https://wiki.haskell.org/Beta_reduction)

If not, return and do the usual thing.

An example is in contrib/jss/optimize-java-call.lisp

To see benefits, (compile-file contrib/jss/test-optimize-java-call.lisp) and then load the compiled file. You should see something like the below which reports the timings for the optimized and unoptimized version of 10000 calls of (#"compile" 'regex.pattern ".*")

--

With optimization: (INVOKE-RESTARGS-MACRO "compile" (QUOTE REGEX.PATTERN) (LIST ".") NIL T) Without optimization: ((LAMBDA (#:G85648 &REST #:G85649) (INVOKE-RESTARGS "compile" #:G85648 #:G85649 NIL)) (QUOTE REGEX.PATTERN) ".")

JUST-LOOP 0.0 seconds real time 0 cons cells

OPTIMIZED-JSS 0.011 seconds real time 0 cons cells

UNOPTIMIZED-JSS 0.325 seconds real time 800156 cons cells

See: https://mailman.common-lisp.net/pipermail/armedbear- devel/2016-October/003726.html https://mailman.common-lisp.net/pipermail/armedbear- devel/2016-November/003733.html

New description:

Alan requests in https://github.com/armedbear/abcl/pull/11:

Precompiler: When compiling a form with a lambda in the function position, possibly optimize it

Case 1: If the lambda has a single form in it, let someone define a transform using:

define-function-position-lambda-transform (body-function-name (arglist form args) &body body)

body-function-name is the car of the single form in the lambda arglist is the arglist of the lambda form is the single form within the lambda args are the arguments to which the lambda will be defined.

The function should check whether it can do a transform, and do it if so, otherwise return nil signalling it couldn't

Case 2: If case 1 is not successful then if the arglist is a simple one (no &key, &rest, &optional) then do a standard beta-reduction binding the args to arglist using let (https://wiki.haskell.org/Beta_reduction)

If not, return and do the usual thing.

An example is in contrib/jss/optimize-java-call.lisp

To see benefits, (compile-file contrib/jss/test-optimize-java-call.lisp) and then load the compiled file. You should see something like the below which reports the timings for the optimized and unoptimized version of 10000 calls of (#"compile" 'regex.pattern ".*")

--

With optimization: (INVOKE-RESTARGS-MACRO "compile" (QUOTE REGEX.PATTERN) (LIST ".") NIL T) Without optimization: ((LAMBDA (#:G85648 &REST #:G85649) (INVOKE-RESTARGS "compile" #:G85648 #:G85649 NIL)) (QUOTE REGEX.PATTERN) ".")

JUST-LOOP 0.0 seconds real time 0 cons cells

OPTIMIZED-JSS 0.011 seconds real time 0 cons cells

UNOPTIMIZED-JSS 0.325 seconds real time 800156 cons cells

See: https://mailman.common-lisp.net/pipermail/armedbear- devel/2016-October/003726.html https://mailman.common-lisp.net/pipermail/armedbear- devel/2016-November/003733.html

--

-- Ticket URL: http://abcl.org/trac/ticket/420#comment:1 armedbear http://abcl.org armedbear

#420: Add ability to optimize function calls with lambda in function position. Use it to optimize jss ------------------------------+-------------------------- Reporter: mevenson | Owner: Type: enhancement | Status: new Priority: major | Milestone: 1.5.0 Component: compiler | Version: 1.5.0-dev Resolution: | Keywords: github-issue Parent Tickets: | ------------------------------+--------------------------

Comment (by aruttenberg):

Updated https://github.com/armedbear/abcl/pull/11

The optimization now checks if the class is defined at compile time, and if not, defers the class lookup to run time.

The test failures were due to the fact that I was transforming (lambda(..) ...) to ((let (...) ...)) instead of (let (...) ...) i.e. one too many parentheses

-- Ticket URL: http://abcl.org/trac/ticket/420#comment:3 armedbear http://abcl.org armedbear