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Optimize 1+' and 1-' on fixnums.

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* libguile/vm-i-scheme.c (INUM_MAX, INUM_MIN): New macros.
  (add1, sub1): Add/subtract without untagging the operand.  This leads
  to a 44% run time improvement compared to the previous
  implementation.

* libguile/vm.c: Include <stdint.h>.

* test-suite/tests/numbers.test ("1+", "1-"): Add tests for
  MOST-POSITIVE-FIXNUM, resp. MOST-NEGATIVE-FIXNUM, for 32-bit and
  34-bit values thereof.

* benchmark-suite/benchmarks/arithmetic.bm: New file.

* benchmark-suite/Makefile.am (SCM_BENCHMARKS): Add it.
This commit is contained in:
Ludovic Courtès 2010-10-13 01:31:19 +02:00
parent de6b3a5cb9
commit e78d4bf9a9
5 changed files with 92 additions and 10 deletions
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1
benchmark-suite/Makefile.am
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@ -1,4 +1,5 @@
SCM_BENCHMARKS = benchmarks/0-reference.bm \
benchmarks/arithmetic.bm \
benchmarks/bytevectors.bm \
benchmarks/chars.bm \
benchmarks/continuations.bm \

46
benchmark-suite/benchmarks/arithmetic.bm Normal file
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@ -0,0 +1,46 @@
;;; -*- mode: scheme; coding: utf-8; -*-
;;; Integer arithmetic.
;;;
;;; Copyright 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 arithmetic)
#:use-module (benchmark-suite lib))
(define-syntax repeat
(lambda (s)
;; Construct an expression of the form `(OP (OP (OP BODY)))', with a
;; depth of COUNT.
(syntax-case s ()
((_ op body count)
(number? (syntax->datum #'count))
(let loop ((count (syntax->datum #'count))
(result #'body))
(if (= 0 count)
result
(loop (1- count)
(with-syntax ((result result))
#'(op result)))))))))
(with-benchmark-prefix "fixnum"
(benchmark "1+" 1e7
(repeat 1+ 2 100))
(benchmark "1-" 1e7
(repeat 1- 2 100)))