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* module/language/cps2/optimize.scm: New file. * module/language/cps2/simplify.scm: New file, factored out of simplify2.scm. * module/language/cps/simplify2.scm: Remove, as it's obsolete. * module/language/cps2/compile-cps.scm: Optimize the CPS. * module/Makefile.am: Adapt for added and deleted files.
56 lines
2.1 KiB
Scheme
56 lines
2.1 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 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 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 `env', as you would imagine. In compiled code this is
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;; 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! simplify #:simplify? #t)
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program)
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