Infrastructure: Switch testing over to Autotest.

[mLib] / utils / t / bits-testgen.py

diff --git a/utils/t/bits-testgen.py b/utils/t/bits-testgen.py
new file mode 100644 (file)
index 0000000..6bb9f88
--- /dev/null
+++ b/utils/t/bits-testgen.py
@@ -0,0 +1,55 @@
+#! /usr/bin/python
+### -*-python-*-
+###
+### Generate input script and expected output for bit manipulation,
+### particularly 64-bit arithmetic.
+
+import sys as SYS
+import random as R
+
+NVEC = 64
+WD = 64
+LIMIT = 1 << WD
+MASK = LIMIT - 1
+
+SYS.argv.pop()
+def arg(default = None):
+  if len(SYS.argv):
+    return SYS.argv.pop()
+  else:
+    return default
+
+R.seed(None)
+SEED = int(arg(R.randrange(0, 1 << 32)))
+R.seed(SEED)
+
+print '### Test vectors for 64-bit arithmetic macros'
+print '###   [generated; seed = 0x%08x]' % SEED
+
+def rol(x, n): return ((x << n) | (x >> (WD - n))) & MASK
+def ror(x, n): return ((x >> n) | (x << (WD - n))) & MASK
+def put(x): return '%0*x' % (WD/4, x)
+
+for name, func in [('lsl', lambda x, n: x << n),
+                   ('lsr', lambda x, n: x >> n),
+                   ('rol', rol),
+                   ('ror', ror)]:
+  print '\n%s64 {' % name
+  for i in xrange(NVEC):
+    x = R.randrange(LIMIT)
+    sh = R.randrange(0, 70) & 63
+    print '  %s %2d %s;' % (put(x), sh, put(func(x, sh) & MASK))
+  for i in xrange(4):
+    x = R.randrange(LIMIT)
+    sh = 32
+    print '  %s %2d %s;' % (put(x), sh, put(func(x, sh) & MASK))
+  print '}'
+
+for name, func in [('add', lambda x, y: x + y),
+                   ('sub', lambda x, y: x - y)]:
+  print '\n%s64 {' % name
+  for i in xrange(NVEC):
+    x = R.randrange(LIMIT)
+    y = R.randrange(LIMIT)
+    print '  %s %s %s;' % (put(x), put(y), put(func(x, y) & MASK))
+  print '}'