From: Stephen Adams <edu/mit/csail/zurich/adams>
Date: Tue, 5 Sep 1995 19:14:35 +0000 (+0000)
Subject: Added constant-folder for STRING->SYMBOL.
X-Git-Tag: 20090517-FFI~5978
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=96a15598f83a250a0444f6fca60ac1f53517d852;p=mit-scheme.git

Added constant-folder for STRING->SYMBOL.
---

diff --git a/v8/src/compiler/midend/cleanup.scm b/v8/src/compiler/midend/cleanup.scm
index 6221200d0..8fcb382b1 100644
--- a/v8/src/compiler/midend/cleanup.scm
+++ b/v8/src/compiler/midend/cleanup.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Id: cleanup.scm,v 1.24 1995/08/10 19:21:58 adams Exp $
+$Id: cleanup.scm,v 1.25 1995/09/05 19:14:35 adams Exp $
 
 Copyright (c) 1994-1995 Massachusetts Institute of Technology
 
@@ -404,6 +404,13 @@ MIT in each case. |#
   (define-commutative-cleanup-rewrite fix:xor)
   (define-commutative-cleanup-rewrite fix:+ +)
   (define-commutative-cleanup-rewrite fix:* *))
+
+(define-cleanup-rewrite 'STRING->SYMBOL 1
+  (lambda (expr)
+    (let  ((value (form/number? expr)))
+      (and (QUOTE/? expr)
+	   (string? (quote/test expr))
+	   `(QUOTE ,(string->symbol (quote/text expr)))))))
 
 ;;
 (let ((NOT-primitive  (make-primitive-procedure 'NOT)))