From ebe2d733302fea50b75d3dd43d1a115e43dcb523 Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Sat, 14 Jun 2014 19:24:01 +0200
Subject: added first draft of real math testcase generator

---
 tests/realmath/generate.py | 52 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 52 insertions(+)
 create mode 100644 tests/realmath/generate.py

diff --git a/tests/realmath/generate.py b/tests/realmath/generate.py
new file mode 100644
index 00000000..c7653321
--- /dev/null
+++ b/tests/realmath/generate.py
@@ -0,0 +1,52 @@
+#!/usr/bin/python
+
+from __future__ import division
+from __future__ import print_function
+
+import sys
+import random
+from contextlib import contextmanager
+
+@contextmanager
+def redirect_stdout(new_target):
+    old_target, sys.stdout = sys.stdout, new_target
+    try:
+        yield new_target
+    finally:
+        sys.stdout = old_target
+
+def random_expression(depth = 3, maxparam = 0):
+    def recursion():
+        return random_expression(depth = depth-1, maxparam = maxparam)
+    if depth == 0:
+        if maxparam != 0 and random.randint(0, 1) != 0:
+            return 'p%02d' % random.randint(0, maxparam-1)
+        return random.choice([ '%e', '%f', '%g' ]) % random.uniform(-2, +2)
+    if random.randint(0, 4) == 0:
+        return recursion() + random.choice([ ' < ', ' <= ', ' == ', ' != ', ' >= ', ' > ' ]) + recursion() + ' ? ' + recursion() + ' : ' + recursion()
+    op_prefix = [ '+(', '-(' ]
+    op_infix = [ ' + ', ' - ', ' * ', ' / ' ]
+    op_func1 = [ '$ln', '$log10', '$exp', '$sqrt', '$floor', '$ceil', '$sin', '$cos', '$tan', '$asin', '$acos', '$atan', '$sinh', '$cosh', '$tanh', '$asinh', '$acosh', '$atanh' ]
+    op_func2 = [ '$pow', '$atan2', '$hypot' ]
+    op = random.choice(op_prefix + op_infix + op_func1 + op_func2)
+    if op in op_prefix:
+        return op + recursion() + ')'
+    if op in op_infix:
+        return '(' + recursion() + op + recursion() + ')'
+    if op in op_func1:
+        return op + '(' + recursion() + ')'
+    if op in op_func2:
+        return op + '(' + recursion() + ', ' + recursion() + ')'
+    raise
+
+for i in range(3): 
+    with file('uut_%05d.v' % i, 'w') as f, redirect_stdout(f):
+        print('module uut_%05d(output [63:0] %s);\n' % (i, ', '.join(['y%02d' % i for i in range(100)])))
+        for i in range(30):
+            print('localparam p%02d = %s;' % (i, random_expression()))
+        for i in range(30, 60):
+            print('localparam p%02d = %s;' % (i, random_expression(maxparam = 30)))
+        for i in range(100):
+            print('assign y%02d = %s;' % (i, random_expression(maxparam = 60)))
+        print('endmodule')
+ 
-- 
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