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authorAndy Wingo <wingo@pobox.com>2011-05-05 10:09:48 +0200
committerAndy Wingo <wingo@pobox.com>2011-05-05 11:43:12 +0200
commit81f529091b4741aea6060194d83d24c17460d652 (patch)
treed05907862c7ef9c41b8124ee2cff8e4299a4e948
parent2d239a78d49a435ffe879c6e4a32a57d486b231b (diff)
downloadguile-81f529091b4741aea6060194d83d24c17460d652.tar.gz
silly "optimization" in (language assembly)
* module/language/assembly.scm (byte-length): Silly, minor tweak: put the fixed-length instruction case first. Seems to shave some 10% off the time compiling psyntax.scm (when the whole rest of the system is compiled, of course).
-rw-r--r--module/language/assembly.scm10
1 files changed, 5 insertions, 5 deletions
diff --git a/module/language/assembly.scm b/module/language/assembly.scm
index e119628da..ad8dead65 100644
--- a/module/language/assembly.scm
+++ b/module/language/assembly.scm
@@ -1,6 +1,6 @@
;;; Guile Virtual Machine Assembly
-;; Copyright (C) 2001, 2009, 2010 Free Software Foundation, Inc.
+;; Copyright (C) 2001, 2009, 2010, 2011 Free Software Foundation, Inc.
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
@@ -37,8 +37,8 @@
(define (byte-length assembly)
(pmatch assembly
- (,label (guard (not (pair? label)))
- 0)
+ ((,inst . _) (guard (>= (instruction-length inst) 0))
+ (+ 1 (instruction-length inst)))
((load-number ,str)
(+ 1 *len-len* (string-length str)))
((load-string ,str)
@@ -51,8 +51,8 @@
(+ 1 *len-len* (bytevector-length bv)))
((load-program ,labels ,len ,meta . ,code)
(+ 1 *program-header-len* len (if meta (1- (byte-length meta)) 0)))
- ((,inst . _) (guard (>= (instruction-length inst) 0))
- (+ 1 (instruction-length inst)))
+ (,label (guard (not (pair? label)))
+ 0)
(else (error "unknown instruction" assembly))))