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6f6a6aee9d
* module/language/cps2/optimize.scm: Move comments here from cps/compile-bytecode.scm. * module/language/cps/compile-bytecode.scm: Remove optimization and closure conversion calls, since CPS2 does this for us. * module/language/cps2/compile-cps.scm (compile-cps): Use set! to save memory at bootstrap-time. Optimize first-order CPS, to get rid of strangeness introduced in closure conversion.
106 lines
4 KiB
Scheme
106 lines
4 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 cse)
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#:use-module (language cps2 dce)
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#:use-module (language cps2 elide-values)
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#:use-module (language cps2 prune-top-level-scopes)
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#:use-module (language cps2 prune-bailouts)
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#:use-module (language cps2 self-references)
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#:use-module (language cps2 simplify)
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#:use-module (language cps2 specialize-primcalls)
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#:use-module (language cps2 split-rec)
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#:use-module (language cps2 type-fold)
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#:use-module (language cps2 verify)
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#:export (optimize-higher-order-cps
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optimize-first-order-cps))
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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 *debug?* #f)
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(define (maybe-verify program)
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(if *debug?*
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(verify program)
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program))
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(define-syntax-rule (define-optimizer optimize (pass kw default) ...)
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(define* (optimize program #:optional (opts '()))
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;; This series of assignments to `program' used to be a series of
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;; let* bindings of `program', as you would imagine. In compiled
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;; code this is fine because the compiler is able to allocate all
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;; let*-bound variable to the same slot, which also means that the
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;; garbage collector doesn't have to retain so many copies of the
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;; term being optimized. However during bootstrap, the interpreter
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;; doesn't do this optimization, leading to excessive data retention
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;; as the terms are rewritten. To marginally improve bootstrap
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;; memory usage, here we use set! instead. The compiler should
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;; produce the same code in any case, though currently it does not
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;; because it doesn't do escape analysis on the box created for the
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;; set!.
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(maybe-verify program)
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(set! program
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(if (kw-arg-ref opts kw default)
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(maybe-verify (pass program))
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program))
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...
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(verify program)
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program))
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;; Passes that are needed:
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;;
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;; * Abort contification: turning abort primcalls into continuation
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;; calls, and eliding prompts if possible.
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;;
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;; * Loop peeling. Unrolls the first round through a loop if the
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;; loop has effects that CSE can work on. Requires effects
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;; analysis. When run before CSE, loop peeling is the equivalent
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;; of loop-invariant code motion (LICM).
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;;
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(define-optimizer optimize-higher-order-cps
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(split-rec #:split-rec? #t)
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(eliminate-dead-code #:eliminate-dead-code? #t)
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(prune-top-level-scopes #:prune-top-level-scopes? #t)
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(simplify #:simplify? #t)
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(contify #:contify? #t)
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(inline-constructors #:inline-constructors? #t)
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(specialize-primcalls #:specialize-primcalls? #t)
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(elide-values #:elide-values? #t)
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(prune-bailouts #:prune-bailouts? #t)
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(eliminate-common-subexpressions #:cse? #t)
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(type-fold #:type-fold? #t)
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(resolve-self-references #:resolve-self-references? #t)
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(eliminate-dead-code #:eliminate-dead-code? #t)
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(simplify #:simplify? #t))
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(define-optimizer optimize-first-order-cps
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(eliminate-dead-code #:eliminate-dead-code? #t)
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(simplify #:simplify? #t))
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