1 files changed, 65 insertions, 0 deletions
diff --git a/ARM_assembly/MultProject/test64x64.py b/ARM_assembly/MultProject/test64x64.py
new file mode 100644
index 0000000..86d02dd
--- /dev/null
+++ b/ARM_assembly/MultProject/test64x64.py
@@ -0,0 +1,65 @@
+#-------------------------------------------------------------------------------
+# Name:        module1
+# Purpose:
+#
+# Author:      tomcl
+#
+# Created:     11/12/2015
+# Copyright:   (c) tomcl 2015
+# Licence:     <your licence>
+#-------------------------------------------------------------------------------
+
+import random
+
+def rand64():
+    bits = random.getrandbits(64) # 64 random bits, us unsigned
+    if bits >= (1<<63):   # convert from unsigned to signed representation
+        return bits - (1<<64)
+    else:
+        return bits
+
+def twosComp(x,width=128): # comvert from signed int to two's comp representation
+                           # choose large default width, when extracting lower bits
+                           # too large a value of width does not matter
+    if x < 0:
+        return (1 << width) + x
+    else:
+        return x
+
+def pw(x):
+    return "0X%X" % (x % (1<<32))
+
+def pw0(x):
+    return pw(twosComp(x))
+
+def pw1(x):
+    return pw (twosComp(x) >> 32)
+
+def pw2(x):
+    return pw (twosComp(x) >> 64)
+
+def pw3(x):
+    return pw (twosComp(x) >> 96)
+
+def makeData(name, num, dat, s=""):
+    return ("%s%s%d DCD %s\n"% (("\n ; " + s + "\n" if s else ""), name, num, ",".join(dat)))
+
+def genTest(num, a,b, s):
+    p = a*b # this is the correct 128 bit product of a and b
+    s = makeData("INA",num, [pw0(a), pw1(a)], s)
+    s += makeData("INB", num, [pw0(b),pw1(b)])
+    s += makeData("OUTAxB", num, [pw0(p),pw1(p),pw2(p),pw3(p)])
+    return s
+
+def makeTestData():
+    s = genTest(0, 0x200000030, 0x50000007000, "Test 0: simple diagnostic")
+    s += genTest(1,0x7FFFFFFF, 0x7FFFFFFF, "Test 1: carries" )
+    s += genTest(2, 0, 0, "Test 2: all zeros")
+    s += genTest(3, -1, -1, "Test 3: both negative")
+    s += genTest(4, -1, 1, "Test 4: A negative")
+    s += genTest(5, 1, -1, "Test 5: B negative")
+    s += genTest(6, rand64(), rand64(), "Test 6: Random bits")
+    s += genTest(7, rand64(), rand64(), "Test 7: Random bits")
+    return s
+
+print makeTestData()