From: Guillermo J. Rozas <edu/mit/csail/zurich/gjr>
Date: Sat, 15 Feb 1992 16:16:57 +0000 (+0000)
Subject: Add byte-unsigned-offset-reference.
X-Git-Tag: 20090517-FFI~9733
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=74e90e04b7a6cc4f9f3d7b9c66b9f74362983211;p=mit-scheme.git

Add byte-unsigned-offset-reference.
---

diff --git a/v7/src/compiler/machines/i386/lapgen.scm b/v7/src/compiler/machines/i386/lapgen.scm
index d6ac536e5..9722af0b8 100644
--- a/v7/src/compiler/machines/i386/lapgen.scm
+++ b/v7/src/compiler/machines/i386/lapgen.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/machines/i386/lapgen.scm,v 1.14 1992/02/15 14:31:42 jinx Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/machines/i386/lapgen.scm,v 1.15 1992/02/15 16:16:57 jinx Exp $
 $MC68020-Header: /scheme/compiler/bobcat/RCS/lapgen.scm,v 4.42 1991/05/28 19:14:26 jinx Exp $
 
 Copyright (c) 1992 Massachusetts Institute of Technology
@@ -163,6 +163,14 @@ MIT in each case. |#
 	(else
 	 (INST-EA (@RO W ,register ,offset)))))
 
+(define (byte-unsigned-offset-reference register offset)
+  (cond ((zero? offset)
+	 (INST-EA (@R ,register)))
+	((fits-in-unsigned-byte? offset)
+	 (INST-EA (@RO UB ,register ,offset)))
+	(else
+	 (INST-EA (@RO UW ,register ,offset)))))
+
 (define-integrable (pseudo-register-offset register)
   (+ (+ (* 16 4) (* 80 4))
      (* 3 (register-renumber register))))