Several SBC optimizations suggested by Piotr Fusik

git-svn-id: svn://svn.cc65.org/cc65/trunk@1121 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-11-17 11:25:12 +00:00
parent 834eff684f
commit c413c5feeb
6 changed files with 53 additions and 58 deletions
--- a/libsrc/runtime/ldec.s
+++ b/libsrc/runtime/ldec.s
@@ -5,13 +5,13 @@
 ;

       	.export	       	deceaxy
-	.importzp	ptr4, sreg
+	.importzp	sreg, tmp1

 deceaxy:
-	sty	ptr4
+	sty	tmp1
 	sec
-	sbc	ptr4
-	sta	ptr4
+	sbc	tmp1
+	sta	tmp1
 	txa
 	sbc	#0
 	tax
@@ -21,6 +21,6 @@ deceaxy:
 	lda	sreg+1
 	sbc	#0
 	sta	sreg+1
-	lda	ptr4
+	lda	tmp1
 	rts