From ae54c2f1ffa1606b1b757f40d5ff93f1afc06e01 Mon Sep 17 00:00:00 2001
From: "Guillermo J. Rozas" <edu/mit/csail/zurich/gjr>
Date: Thu, 19 Jul 1990 19:11:32 +0000
Subject: [PATCH] Take word size into account.  Shifts past fixnum size always
 return 0.

---
 v7/src/microcode/fixnum.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/v7/src/microcode/fixnum.c b/v7/src/microcode/fixnum.c
index 9f43f5f6d..0a718316e 100644
--- a/v7/src/microcode/fixnum.c
+++ b/v7/src/microcode/fixnum.c
@@ -1,6 +1,6 @@
 /* -*-C-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/microcode/fixnum.c,v 9.31 1990/07/15 22:49:32 jinx Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/microcode/fixnum.c,v 9.32 1990/07/19 19:11:32 jinx Rel $
 
 Copyright (c) 1987, 1988, 1989, 1990 Massachusetts Institute of Technology
 
@@ -313,11 +313,11 @@ DEFINE_PRIMITIVE ("FIXNUM-LSH", Prim_fixnum_lsh, 2, 2, 0)
 
   if (y < 0)
   {
-    z = (x >> (- y));
+    z = ((y < (- FIXNUM_LENGTH)) ? 0 : (x >> (- y)));
   }
   else
   {
-    z = (x << y);
+    z = ((y > FIXNUM_LENGTH) ? 0 : (x << y));
   }
   return (LONG_TO_FIXNUM (z));
 }
-- 
2.25.1