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speed and simplicity improvement for next_power_of_two function

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protolambda 2019-06-04 18:12:23 +02:00
parent 578328bb54
commit 6168a90a20
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1 changed files with 1 additions and 10 deletions
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11
test_libs/pyspec/eth2spec/utils/merkle_minimal.py
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@ -41,16 +41,7 @@ def next_power_of_two(v: int) -> int:
""" """
if v == 0: if v == 0:
return 1 return 1
# effectively fill the bitstring (1 less, do not want to with ones, then increment for next power of 2. return 1 << (v-1).bit_length()
v -= 1
v |= v >> (1 << 0)
v |= v >> (1 << 1)
v |= v >> (1 << 2)
v |= v >> (1 << 3)
v |= v >> (1 << 4)
v |= v >> (1 << 5)
v += 1
return v
def merkleize_chunks(chunks): def merkleize_chunks(chunks):