Added special multiplication routines

git-svn-id: svn://svn.cc65.org/cc65/trunk@1012 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-10-04 21:34:14 +00:00
parent 560ac0ac43
commit 0fdf581d06
6 changed files with 188 additions and 36 deletions
--- a/libsrc/runtime/mulax3.s
+++ b/libsrc/runtime/mulax3.s
@@ -0,0 +1,27 @@
+;
+; Ullrich von Bassewitz, 04.10.2001
+;
+; CC65 runtime: Multiply the primary register
+;
+
+   	.export		mulax3
+	.importzp	ptr1
+		
+.proc	mulax3
+
+	sta     ptr1
+	stx	ptr1+1
+	asl	a
+	rol	ptr1+1
+	clc
+	adc	ptr1
+	pha
+	txa
+	adc	ptr1+1
+	tax
+	pla
+	rts
+
+.endproc
+
+