Add a script to compute powers of 10
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support/compute-powers.py
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16
support/compute-powers.py
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#!/usr/bin/env python
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# Compute 10 ** exp with exp in the range [min_exponent, max_exponent] and print
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# normalized (with most-significant bit equal to 1) significands in hexadecimal.
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from __future__ import print_function
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min_exponent = -348
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max_exponent = 340
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step = 8
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significand_size = 64
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for exp in range(min_exponent, max_exponent + 1, step):
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n = 10 ** exp if exp >= 0 else 2 ** 2000 / 10 ** -exp
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k = significand_size + 1
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# Convert to binary and round.
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n = (int('{:0<{}b}'.format(n, k)[:k], 2) + 1) / 2
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print('{:0<#16x}ull'.format(n))
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