From: Stephen Adams <edu/mit/csail/zurich/adams>
Date: Sat, 20 Jul 1996 23:03:03 +0000 (+0000)
Subject: Added constant-folding of %fixnum->flonum.
X-Git-Tag: 20090517-FFI~5466
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=75ac530193aed53a5c8475dd92ec8da847a577e5;p=mit-scheme.git

Added constant-folding of %fixnum->flonum.
---

diff --git a/v8/src/compiler/midend/cleanup.scm b/v8/src/compiler/midend/cleanup.scm
index 0a04366c8..ac6db2e88 100644
--- a/v8/src/compiler/midend/cleanup.scm
+++ b/v8/src/compiler/midend/cleanup.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Id: cleanup.scm,v 1.29 1996/03/09 18:28:42 adams Exp $
+$Id: cleanup.scm,v 1.30 1996/07/20 23:03:03 adams Exp $
 
 Copyright (c) 1994-1996 Massachusetts Institute of Technology
 
@@ -407,6 +407,12 @@ MIT in each case. |#
 	 (QUOTE/? e2)
 	 `(QUOTE ,(eq? (quote/text e1) (quote/text e2))))))
 
+(define-cleanup-rewrite %fixnum->flonum 1
+  (lambda (expr)
+    (and (QUOTE/? expr)
+	 (fixnum? (quote/text expr))
+	 `(QUOTE ,(exact->inexact (quote/text expr))))))
+
 (let ((NOT-primitive  (make-primitive-procedure 'NOT)))
   (define (form-absorbs-not? form)
     ;; Assumption: open-coded (non out-of-line) predicates can be compiled