New sample program.

src/test/lfsr.s

@@ -0,0 +1,26 @@
+.perm x
+.entry
+.global
+entry: ldi %r0, #0x1234;
+       ldi %r3, #100;
+
+loop:  ori %r7, %r0, #0;
+       jali %r5, printhex
+       jali %r5, lfsr_step
+
+       subi %r3, %r3, #1
+       rtop @p0, %r3
+ @p0 ? jmpi loop
+	
+       halt
+
+/* %r0: value and return value 
+ * %r5: return address
+ */
+lfsr_step: shri %r1, %r0, #30
+           shri %r2, %r0, #2
+           xor  %r1, %r1, %r2
+           andi %r1, %r1, #1
+           shli %r0, %r0, #1
+           or %r0, %r0, %r1
+           jmpr %r5