#default
Mul: 1.0457470417
Div: 2.65450692177
Sub: 0.871921062469
Divmod: 1.95720386505
Combo: 5.96903395653

Mul: 1.01342606544
Div: 2.71628308296
Sub: 0.875638008118
Divmod: 1.95388221741
Combo: 6.09685087204

Mul: 1.00868797302
Div: 2.707862854
Sub: 0.874716997147
Divmod: 1.94629001617
Combo: 6.09136390686

# math-improvement branch
Mul: 1.01715111732
Div: 2.44827103615
Sub: 0.700042963028
Divmod: 1.807336092
Combo: 5.29910898209

Mul: 0.982100009918
Div: 2.4520919323
Sub: 0.691036939621
Divmod: 1.81433415413
Combo: 5.25664901733

Mul: 0.98149394989
Div: 2.45189714432
Sub: 0.691314935684
Divmod: 1.8157248497
Combo: 5.25712394714


bench.py:
from time import time

def bench_mul():
    for x in range(50000000):
        l = long(x)
        l *= 2              # mul, power of two
        l *= 3              # mul, not power of two

def bench_div():
    for x in range(50000000):
        l = long(x)
        l //= 2              # floordiv, power of two
        l //= 3              # floordiv, not power of two

def bench_sub():
    for x in range(50000000):
        l = long(x)
        l -= 1              # sub

def bench_divmod():
    for x in range(50000000):
        l = long(x)
        r, m = divmod(l, 3) # divmod

def bench_combo():
    for x in range(50000000):
        l = long(x)
        l *= 2
        l //= 2
        l *= 3
        l //= 3
        l -= 1
        r, m = divmod(l, 3) # divmod

for x in range(3):
    t = time()
    bench_mul()
    print "Mul:", time() - t

    t = time()
    bench_div()
    print "Div:", time() - t

    t = time()
    bench_sub()
    print "Sub:", time() - t

    t = time()
    bench_divmod()
    print "Divmod:", time() - t

    t = time()
    bench_combo()
    print "Combo:", time() - t

    print ""