Add more branchless functions

branchless.py

@@ -1,4 +1,10 @@
-Sgn = lambda a: 1 * (a > 0) + (-1) * (a <= 0) 
+IsEven = lambda a: (a & 1) ^ 1
+IsOdd = lambda a: a & 1
+
+MinZeroAnd = lambda a: a * (a <= 0) + 0 * (a > 0)
+MaxZeroAnd = lambda a: a * (a >= 0) + 0 * (a < 0)
+
+Sgn = lambda a: (a > 0) - (a < 0) 
 Abs = lambda a: a * (a > 0) + (-a) * (a <= 0)
 
 Min = lambda a,b: a * (a < b) + b * (b <= a)
@@ -10,8 +16,20 @@
 Upper2 = lambda s: "".join(chr(ord(s[i]) - 32 * (s[i] >= 'a' and s[i] <= 'z' )) for i in range(0,len(s)))
 Lower2 = lambda s: "".join(chr(ord(s[i]) + 32 * (s[i] >= 'A' and s[i] <= 'Z' )) for i in range(0,len(s)))
 
+clamp = lambda x, min_,max_: min(max(x, min_), max_)
+
 
 def test():
+  assert(IsOdd(3) == True)
+  assert(IsOdd(2) == False)
+  assert(IsEven(3) == False)
+  assert(IsEven(2) == True)
+
+  assert(MinZeroAnd(-3) == -3)
+  assert(MinZeroAnd(3) == 0)
+  assert(MaxZeroAnd(-3) == 0)
+  assert(MaxZeroAnd(3) == 3)
+
   assert(Sgn(-3) == -1)
   assert(Sgn(3) == 1)
   assert(Abs(-3) == 3)