PyPy doesn't do basic loop-invariant optimizations
Created originally on Bitbucket by Anonymous
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.
#!python
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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