New SplitBit programs.

Programs/testPrograms/twoPointerCopy.asm

@@ -0,0 +1,46 @@
+; Copies a string from one place in Data Memory to another, reading through DP0
+; and writing through DP1 at the same time.
+;
+; On a machine with one Data Pointer this loop needs a PSHD and a POPD on every
+; pass to swap the pointer between the two regions. With two pointers it is just
+; a load and a store.
+;
+; It also checks that a bare mnemonic still means DP0.
+
+#Program
+
+start:
+  SETD.0 Source     ; DP0 walks the source.
+  SETD.1 Dest       ; DP1 walks the destination.
+
+copy:
+  LDA.0             ; Read a byte through DP0.
+  BRA copyDone      ; A zero byte is the end of the string.
+  STA.1             ; Write it through DP1.
+  INCD.0
+  INCD.1
+  BRI copy
+
+copyDone:
+  SETD Dest         ; No selector, so this is DP0.
+print:
+  LDA
+  BRA end
+  OUTA 0x00
+  INCD
+  BRI print
+
+end:
+  INIA 0x0A
+  OUTA 0x00
+  HALT
+
+#Data
+
+Source:
+"Two pointers, no stack shenanigans."
+
+Dest:
+0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
+0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00