| 1 | #!/usr/bin/env python2
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| 2 | """
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| 3 | integers.py
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| 4 | """
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| 5 | from __future__ import print_function
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| 6 |
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| 7 | import os
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| 8 | from mycpp import mops
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| 9 | from mycpp.mylib import log
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| 10 |
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| 11 | from typing import cast
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| 12 |
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| 13 |
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| 14 | def run_tests():
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| 15 | # type: () -> None
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| 16 |
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| 17 | a = 3 + 2
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| 18 | print('a = %d' % a)
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| 19 |
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| 20 | # the way to write 1 << 31
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| 21 | i1 = mops.LShift(mops.BigInt(1), mops.BigInt(31))
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| 22 | i2 = mops.Add(i1, i1)
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| 23 | i3 = mops.Add(i2, i1)
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| 24 |
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| 25 | # TODO: %d or %ld doesn't work, and won't work when it becomes arbitrary
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| 26 | # size
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| 27 | print('i1 = %s' % mops.ToStr(i1))
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| 28 | print('i2 = %s' % mops.ToStr(i2))
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| 29 | print('i3 = %s' % mops.ToStr(i3))
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| 30 | print('')
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| 31 |
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| 32 | # This overflows an int64_t
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| 33 | i4 = mops.LShift(mops.BigInt(1), mops.BigInt(63))
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| 34 | #print('i4 = %s' % mops.ToStr(i4))
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| 35 |
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| 36 | # Max positive (2 ^ (N-1)) - 1
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| 37 | x = mops.LShift(mops.BigInt(1), mops.BigInt(62))
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| 38 | y = mops.Sub(x, mops.BigInt(1))
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| 39 | max_positive = mops.Add(x, y)
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| 40 | print('max_positive = %s' % mops.ToStr(max_positive))
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| 41 |
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| 42 | # Max negative -2 ^ (N-1)
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| 43 | z = mops.Sub(mops.BigInt(0), x)
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| 44 | max_negative = mops.Sub(z, x)
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| 45 | print('max_negative = %s' % mops.ToStr(max_negative))
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| 46 |
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| 47 | # Round trip from string
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| 48 | s1 = mops.ToStr(max_negative)
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| 49 | print('max_negative string = %s' % s1)
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| 50 |
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| 51 | ok, max_negative2 = mops.FromStr2(s1)
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| 52 | print('max_negative2 = %s' % mops.ToStr(max_negative2))
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| 53 | if ok:
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| 54 | print('ok')
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| 55 |
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| 56 | if mops.Equal(max_negative, max_negative2):
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| 57 | print('round trip equal')
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| 58 |
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| 59 | big = mops.IntWiden(a)
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| 60 | print('big = %s' % mops.ToStr(big))
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| 61 | small = mops.BigTruncate(big)
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| 62 | print('small = %d' % small)
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| 63 |
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| 64 |
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| 65 | def run_benchmarks():
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| 66 | # type: () -> None
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| 67 | pass
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| 68 |
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| 69 |
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| 70 | if __name__ == '__main__':
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| 71 | if os.getenv('BENCHMARK'):
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| 72 | log('Benchmarking...')
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| 73 | run_benchmarks()
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| 74 | else:
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| 75 | run_tests()
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