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Optimize `peek-char'.

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This makes `peek-char' 40x faster on a port whose encoding is
faster on a UTF-8 port containing multi-byte codepoints.

The `xml->sxml' procedure is 4x faster on a 2.7 MiB XML file.

* libguile/ports.c (get_codepoint): New procedure, moved here from
  `scm_getc', with the additional BUF and LEN parameters.
  (scm_getc): Use it.
  (scm_peek_char): Use it instead of the `scm_getc'/`scm_ungetc'
  sequence.

* test-suite/tests/ports.test ("string ports")["peek-char [latin-1]",
  "peek-char [utf-8]"]: New tests.

* benchmark-suite/Makefile.am (SCM_BENCHMARKS): Add
  `benchmarks/ports.bm'.

* benchmark-suite/benchmarks/ports.bm: New file.
This commit is contained in:
Ludovic Courtès 2010-09-15 18:38:57 +02:00
parent e9c3018cec
commit fd5eec2b6e
4 changed files with 132 additions and 14 deletions
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1
benchmark-suite/Makefile.am
View file

@ -4,6 +4,7 @@ SCM_BENCHMARKS = benchmarks/0-reference.bm \
benchmarks/continuations.bm \
benchmarks/if.bm \
benchmarks/logand.bm \
benchmarks/ports.bm \
benchmarks/read.bm \
benchmarks/srfi-1.bm \
benchmarks/srfi-13.bm \

67
benchmark-suite/benchmarks/ports.bm Normal file
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@ -0,0 +1,67 @@
;;; ports.bm --- Port I/O. -*- mode: scheme; coding: utf-8; -*-
;;;
;;; Copyright (C) 2010 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 ports)
#:use-module (benchmark-suite lib))
(define %latin1-port
(with-fluids ((%default-port-encoding #f))
(open-input-string "hello, world")))
(define %utf8/ascii-port
(with-fluids ((%default-port-encoding "UTF-8"))
(open-input-string "hello, world")))
(define %utf8/wide-port
(with-fluids ((%default-port-encoding "UTF-8"))
(open-input-string "안녕하세요")))
(with-benchmark-prefix "peek-char"
(benchmark "latin-1 port" 700000
(peek-char %latin1-port))
(benchmark "utf-8 port, ascii character" 700000
(peek-char %utf8/ascii-port))
(benchmark "utf-8 port, Korean character" 700000
(peek-char %utf8/wide-port)))
(with-benchmark-prefix "read-char"
(benchmark "latin-1 port" 10000000
(read-char %latin1-port))
(benchmark "utf-8 port, ascii character" 10000000
(read-char %utf8/ascii-port))
(benchmark "utf-8 port, Korean character" 10000000
(read-char %utf8/wide-port)))
(with-benchmark-prefix "char-ready?"
(benchmark "latin-1 port" 10000000
(char-ready? %latin1-port))
(benchmark "utf-8 port, ascii character" 10000000
(char-ready? %utf8/ascii-port))
(benchmark "utf-8 port, Korean character" 10000000
(char-ready? %utf8/wide-port)))