Added a few more specialized multiply routines

git-svn-id: svn://svn.cc65.org/cc65/trunk@1193 b7a2c559-68d2-44c3-8de9-860c34a00d81
2002-03-16 20:27:50 +00:00
parent 486640200b
commit 854f23e945
4 changed files with 97 additions and 0 deletions
--- a/libsrc/runtime/mulax6.s
+++ b/libsrc/runtime/mulax6.s
@@ -0,0 +1,30 @@
+;
+; Ullrich von Bassewitz, 16.03.2002
+;
+; CC65 runtime: Multiply the primary register
+;
+
+   	.export	      	mulax6
+	.importzp     	ptr1
+
+.proc	mulax6
+
+	sta     ptr1
+	stx	ptr1+1
+	asl	a
+	rol	ptr1+1
+	clc
+	adc	ptr1
+	pha
+	txa
+	adc	ptr1+1
+	sta	ptr1+1
+	pla
+	asl	a
+	rol	ptr1+1
+ 	ldx	ptr1+1
+	rts
+
+.endproc
+
+