Probably would be better making it a mathop so it is more self
describing. Given the impact sounds a good idea.
Something like this, you mean? I'm open to suggestions of a snappier name...
#ifndef MODULUS_WHERE_DIVIDEND_IS_LIKELY_INCREMENTED_BY_DIVISOR
# define MODULUS_WHERE_DIVIDEND_IS_LIKELY_INCREMENTED_BY_DIVISOR(dividend,
divisor, prev_dividend, modulus) \
do { \
if ((prev_dividend) == 0 || (dividend) - (prev_dividend) != (divisor)) \
(modulus) = (dividend) % (divisor); \
(prev_dividend) = (dividend); \
} while (0)
#endif
Ben
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