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Factor out compute-effects/elide-type-checks from dce.scm
* module/language/cps/type-checks.scm: New module. * module/language/cps/dce.scm: Use new module. * module/Makefile.am: Add new module.
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3 changed files with 74 additions and 37 deletions
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@ -142,6 +142,7 @@ CPS_LANG_SOURCES = \
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language/cps/spec.scm \
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language/cps/specialize-primcalls.scm \
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language/cps/split-rec.scm \
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language/cps/type-checks.scm \
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language/cps/type-fold.scm \
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language/cps/types.scm \
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language/cps/utils.scm \
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@ -32,48 +32,12 @@
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#:use-module (language cps)
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#:use-module (language cps effects-analysis)
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#:use-module (language cps renumber)
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#:use-module (language cps types)
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#:use-module (language cps type-checks)
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#:use-module (language cps utils)
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#:use-module (language cps intmap)
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#:use-module (language cps intset)
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#:export (eliminate-dead-code))
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(define (elide-type-checks conts kfun effects)
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"Elide &type-check effects from EFFECTS for the function starting at
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KFUN where we can prove that no assertion will be raised at run-time."
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(let ((types (infer-types conts kfun)))
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(define (visit-primcall effects fx label name args)
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(if (primcall-types-check? types label name args)
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(intmap-replace! effects label (logand fx (lognot &type-check)))
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effects))
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(persistent-intmap
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(intmap-fold (lambda (label types effects)
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(let ((fx (intmap-ref effects label)))
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(cond
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((causes-all-effects? fx) effects)
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((causes-effect? fx &type-check)
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(match (intmap-ref conts label)
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(($ $kargs _ _ exp)
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(match exp
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(($ $continue k src ($ $primcall name args))
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(visit-primcall effects fx label name args))
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(($ $continue k src
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($ $branch _ ($primcall name args)))
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(visit-primcall effects fx label name args))
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(_ effects)))
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(_ effects)))
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(else effects))))
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types
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effects))))
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(define (compute-effects/elide-type-checks conts)
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(intmap-fold (lambda (label cont effects)
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(match cont
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(($ $kfun) (elide-type-checks conts label effects))
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(_ effects)))
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conts
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(compute-effects conts)))
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(define (fold-local-conts proc conts label seed)
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(match (intmap-ref conts label)
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(($ $kfun src meta self tail clause)
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72
module/language/cps/type-checks.scm
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72
module/language/cps/type-checks.scm
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@ -0,0 +1,72 @@
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;;; 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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;;; This pass kills dead expressions: code that has no side effects, and
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;;; whose value is unused. It does so by marking all live values, and
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;;; then discarding other values as dead. This happens recursively
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;;; through procedures, so it should be possible to elide dead
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;;; procedures as well.
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;;;
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;;; Code:
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(define-module (language cps type-checks)
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#:use-module (ice-9 match)
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#:use-module (language cps)
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#:use-module (language cps effects-analysis)
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#:use-module (language cps types)
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#:use-module (language cps intmap)
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#:export (elide-type-checks
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compute-effects/elide-type-checks))
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(define (elide-type-checks conts kfun effects)
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"Elide &type-check effects from EFFECTS for the function starting at
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KFUN where we can prove that no assertion will be raised at run-time."
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(let ((types (infer-types conts kfun)))
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(define (visit-primcall effects fx label name args)
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(if (primcall-types-check? types label name args)
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(intmap-replace! effects label (logand fx (lognot &type-check)))
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effects))
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(persistent-intmap
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(intmap-fold (lambda (label types effects)
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(let ((fx (intmap-ref effects label)))
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(cond
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((causes-all-effects? fx) effects)
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((causes-effect? fx &type-check)
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(match (intmap-ref conts label)
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(($ $kargs _ _ exp)
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(match exp
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(($ $continue k src ($ $primcall name args))
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(visit-primcall effects fx label name args))
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(($ $continue k src
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($ $branch _ ($primcall name args)))
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(visit-primcall effects fx label name args))
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(_ effects)))
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(_ effects)))
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(else effects))))
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types
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effects))))
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(define (compute-effects/elide-type-checks conts)
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(intmap-fold (lambda (label cont effects)
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(match cont
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(($ $kfun) (elide-type-checks conts label effects))
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(_ effects)))
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conts
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(compute-effects conts)))
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