added python script to check if value can be immediate in ARM asm

Author: spitford

rotator.py

@@ -0,0 +1,27 @@
+from __future__ import print_function   # PEP 3105
+import sys
+
+# Rotate right: 0b1001 --> 0b1100
+ror = lambda val, r_bits, max_bits: \
+    ((val & (2**max_bits-1)) >> r_bits%max_bits) | \
+    (val << (max_bits-(r_bits%max_bits)) & (2**max_bits-1))
+
+max_bits = 32
+
+input = int(raw_input("Enter the value you want to check: "))
+
+print()
+for n in xrange(1, 256):
+
+    for i in xrange(0, 31, 2):
+
+        rotated = ror(n, i, max_bits)
+
+        if(rotated == input):
+            print("The number %i can be used as a valid immediate number." % input)
+            print("%i ror %x --> %s" % (n, int(str(i), 16), rotated))
+            print()
+            sys.exit()
+
+else:
+    print("Sorry, %i cannot be used as an immediate number and has to be split." % input)