#7949: Bit-shifts in Z/(n)
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Reporter: spancratz | Owner: spancratz
Type: defect | Status: new
Priority: minor | Milestone: sage-4.3.1
Component: basic arithmetic | Keywords: bit shift, integer mod ring
Work_issues: | Author: spancratz
Upstream: N/A | Reviewer:
Merged: |
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Comment(by spancratz):
For each of the three types for moduli (32-bit, 64-bit, mpz_t), the patch
provides a method ``shift``, which in turns is called by the methods
``__lshift__`` and ``__rshift__``.
Finally, in the previous code the doctests with modulus `2^{31}-1` did not
test any of the 64-bit code because of code in the method ``def
__init__(NativeIntStruct self, sage.rings.integer.Integer z)`` in the file
``integer_mod.pyx``. There, a comparisons were carried out with ``<``
rather than ``<=``, which this patch changes, too.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7949#comment:2>
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