More shift routines

git-svn-id: svn://svn.cc65.org/cc65/trunk@820 b7a2c559-68d2-44c3-8de9-860c34a00d81
2001-07-25 21:36:01 +00:00
parent c2e45ea24d
commit d55c271c2a
8 changed files with 144 additions and 2 deletions
--- a/libsrc/runtime/asleax4.s
+++ b/libsrc/runtime/asleax4.s
@@ -0,0 +1,22 @@
+;
+; Ullrich von Bassewitz, 25.07.2001
+;
+; CC65 runtime: Scale the 32 bit primary register by 16
+;
+
+	.export		asleax4, shleax4
+	.importzp	sreg, tmp1
+
+asleax4:
+shleax4:
+       	stx	tmp1
+	ldx	#4
+@L1:	asl	a
+       	rol	tmp1
+       	rol	sreg
+       	rol	sreg+1
+	dex
+	bne	@L1
+	ldx	tmp1
+	rts
+