[issue1205239] Let shift operators take any integer value

[Craig McQueen]

Craig McQueen <python at craig.mcqueen.id.au> added the comment:

Just for the record... here is a relevant use case...

I'm working on some code for calculating CRCs, and hope to support any CRC width, including CRC-5. This involves, among the calculations:

    crc >> (crc_width - 8)

The complete expression is:

    crc = table[((crc >> (crc_width - 8)) ^ data_byte) & 0xFF] ^ (crc << 8)

where crc_width is typically 32 or 16, but in the case of CRC-5 would be 5.

I think the calculation would work fine for all cases, if only Python allowed me to right-shift with a negative number. But now I'll have to handle the two cases separately.

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nosy: +cmcqueen1975

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<http://bugs.python.org/issue1205239>
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