New issue 1886: PyPy doesn't do basic loop-invariant optimizations
https://bitbucket.org/pypy/pypy/issue/1886/pypy-doesnt-do-basic-loop-invariant
mario_:
This code can be sped up about 25% by realizing that a[i] is constant in the
inner loop.
I know threading potentially invalidates such optimizations but there are some
options to work around that.
n = 10**4
a = [list(range(n))]*n
s = 0
for i in range(n):
#ai = a[i]
for j in range(n):
s += a[i][j]
print(s)
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