Rewrite the decsp and subysp functions now since they are used more often.

git-svn-id: svn://svn.cc65.org/cc65/trunk@665 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-03-24 16:15:01 +00:00
parent eec01763c4
commit 1e1199cb2b
7 changed files with 66 additions and 39 deletions
--- a/libsrc/runtime/decsp4.s
+++ b/libsrc/runtime/decsp4.s
@@ -5,16 +5,23 @@
 ;

       	.export	      	decsp4
-	.import		subysp
+       	.importzp	sp

 .proc	decsp4

-	ldy	#4
-	jmp	subysp
+	lda	sp
+	sec
+	sbc	#4
+	sta	sp
+	bcc	@L1
+	rts
+
+@L1:	dec	sp+1
+	rts

 .endproc




-	
+