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* module/language/cps2/constructors.scm: New file. * module/language/cps2/optimize.scm: Enable inline-constructors pass. * module/Makefile.am: Add new file to build.
72 lines
3 KiB
Scheme
72 lines
3 KiB
Scheme
;;; Continuation-passing style (CPS) intermediate language (IL)
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;; Copyright (C) 2013, 2014, 2015 Free Software Foundation, Inc.
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;;; Commentary:
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;;;
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;;; Optimizations on CPS2.
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;;;
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;;; Code:
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(define-module (language cps2 optimize)
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#:use-module (ice-9 match)
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#:use-module (language cps2 constructors)
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#:use-module (language cps2 contification)
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#:use-module (language cps2 dce)
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#:use-module (language cps2 prune-top-level-scopes)
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#:use-module (language cps2 simplify)
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#:export (optimize))
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(define (kw-arg-ref args kw default)
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(match (memq kw args)
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((_ val . _) val)
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(_ default)))
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(define* (optimize program #:optional (opts '()))
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(define (run-pass! pass kw default)
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(set! program
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(if (kw-arg-ref opts kw default)
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(pass program)
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program)))
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;; This series of assignments to `env' used to be a series of let*
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;; bindings of `program', as you would imagine. In compiled code this
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;; is fine because the compiler is able to allocate all let*-bound
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;; variable to the same slot, which also means that the garbage
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;; collector doesn't have to retain so many copies of the term being
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;; optimized. However during bootstrap, the interpreter doesn't do
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;; this optimization, leading to excessive data retention as the terms
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;; are rewritten. To marginally improve bootstrap memory usage, here
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;; we use set! instead. The compiler should produce the same code in
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;; any case, though currently it does not because it doesn't do escape
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;; analysis on the box created for the set!.
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(run-pass! eliminate-dead-code #:dce2? #t)
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(run-pass! prune-top-level-scopes #:prune-top-level-scopes? #t)
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(run-pass! simplify #:simplify? #t)
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(run-pass! contify #:contify? #t)
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(run-pass! inline-constructors #:inline-constructors? #t)
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;; (run-pass! specialize-primcalls #:specialize-primcalls? #t)
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;; (run-pass! elide-values #:elide-values? #t)
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;; (run-pass! prune-bailouts #:prune-bailouts? #t)
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;; (run-pass! eliminate-common-subexpressions #:cse? #t)
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;; (run-pass! type-fold #:type-fold? #t)
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;; (run-pass! resolve-self-references #:resolve-self-references? #t)
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;; (run-pass! eliminate-dead-code #:eliminate-dead-code? #t)
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;; (run-pass! simplify #:simplify? #t)
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program)
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