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;;; subr.bm --- Measure the subr invocation cost. -*- Scheme -*-
;;;
;;; Copyright (C) 2009 Free Software Foundation, Inc.
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Lesser General Public License
;;; as published by the Free Software Foundation; either version 3, or
;;; (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with this software; see the file COPYING.LESSER. If
;;; not, write to the Free Software Foundation, Inc., 51 Franklin
;;; Street, Fifth Floor, Boston, MA 02110-1301 USA
(define-module (benchmarks subrs)
:use-module (benchmark-suite lib))
(define hook1 (make-hook 1))
(define hook3 (make-hook 3))
(with-benchmark-prefix "subr invocation"
(benchmark "simple subr" 700000
;; 1 required argument, 0 optional arguments, no rest.
(1+ 0))
(benchmark "generic subr" 700000
;; 2 required arguments, 4 optional arguments, no rest.
;; In Guile 1.8 and earlier, such subrs are implemented as "compiled
;; closures" (cclos). There, when a cclo/gsubr is called, the evaluator
;; goes through `SCM_APPLY ()' and conses the arguments, which is more
;; costly than the invocation of a "simple subr".
(string= "foo" "bar"))
(benchmark "generic subr with rest arg" 700000
;; 1 required argument, 0 optional arguments, 1 rest.
(run-hook hook1 1))
(benchmark "generic subr with rest arg and 3+ parameters" 700000
;; 1 required argument, 0 optional arguments, 1 rest.
;; The evaluator considers calls with 3 and more parameters as a general
;; form and always stores the arguments into a list.
(run-hook hook3 1 2 3)))
(with-benchmark-prefix "subr application"
(benchmark "simple subr" 700000
(apply 1+ '(0)))
(benchmark "generic subr" 700000
(apply string= "foo" '("bar")))
(benchmark "generic subr with rest arg" 700000
(apply run-hook hook1 '(1)))
(benchmark "generic subr with rest arg and 3+ parameters" 700000
(run-hook hook3 1 2 '(3))))
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