Add `need-registers!' operation.

diff --git a/v7/src/compiler/back/lapgn1.scm b/v7/src/compiler/back/lapgn1.scm
index 6e679a4bc51a704cf07f61beabb2cdf6fafa19f2..eff72f573f1a3094877adc1b5b327b32a14a2bed 100644 (file)
--- 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 1.35 1987/05/29 17:57:40 cph Exp $
+$Header: /Users/cph/tmp/foo/mit-scheme/mit-scheme/v7/src/compiler/back/lapgn1.scm,v 1.36 1987/06/11 20:44:20 cph Exp $
 
 Copyright (c) 1987 Massachusetts Institute of Technology
 
@@ -172,6 +172,10 @@ MIT in each case. |#
 (define-integrable (need-register! register)
   (set! *needed-registers* (cons register *needed-registers*)))
 
+(define-integrable (need-registers! registers)
+  ;; **** Assume EQ? works on registers here. ****
+  (set! *needed-registers* (eq-set-union registers *needed-registers*)))
+
 (define (maybe-need-register! register)
   (if register (need-register! register))
   register)