pystencils.sympyextensions.bit_masks.bit_conditional

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pystencils.sympyextensions.bit_masks.bit_conditional#

class pystencils.sympyextensions.bit_masks.bit_conditional(*args)#

Evaluates a bit condition on an integer mask, and returns the value of one of two expressions, depending on whether the bit is set.

Semantics:

#   Three-argument version
flag_cond(bitpos, mask, expr) = expr if (bitpos is set in mask) else 0

#   Four-argument version
flag_cond(bitpos, mask, expr_then, expr_else) = expr_then if (bitpos is set in mask) else expr_else

The bitpos and mask arguments must both be of the same integer type. When in doubt, fix the type using tcast.

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