From: Chris Hanson <org/chris-hanson/cph>
Date: Wed, 13 May 1987 10:59:51 +0000 (+0000)
Subject: Add operation to test whether a register has an alias.
X-Git-Tag: 20090517-FFI~13521
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=be7e2f72ec650d0af448f95a568894079d661563;p=mit-scheme.git

Add operation to test whether a register has an alias.
---

diff --git a/v7/src/compiler/back/lapgn1.scm b/v7/src/compiler/back/lapgn1.scm
index 8c3d3b199..e512a5136 100644
--- a/v7/src/compiler/back/lapgn1.scm
+++ b/v7/src/compiler/back/lapgn1.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/back/lapgn1.scm,v 1.29 1987/05/07 04:39:55 cph Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/back/lapgn1.scm,v 1.30 1987/05/13 10:59:51 cph Exp $
 
 Copyright (c) 1987 Massachusetts Institute of Technology
 
@@ -170,6 +170,9 @@ MIT in each case. |#
   (if register (need-register! register))
   register)
 
+(define-integrable (register-has-alias? register type)
+  (pseudo-register-alias *register-map* type register))
+
 (define-integrable (register-alias register type)
   (maybe-need-register! (pseudo-register-alias *register-map* type register)))