Am 26.08.2018 um 11:43 schrieb Giuliano Colla: > Il 23/08/2018 11:34, Marco Borsari via fpc-pascal ha scritto: > >> It would be for the Wirth optimization in the access of an array, >> when the index is 0 or 1, allowing the elimination of a multiplication. > > I'm afraid that this sort of optimization is rather outdated, and doesn't > take into account a number of factors which > make modern processors behave quite differently from old times ones.
Multiplication is much less expensive then a jmp in most cases on today's CPUs. It is even the other way round, it is often useful to replace an if statement by a multiplication like: if a>b then Inc(c,d); can be replaced on modern CPUs by Inc(c,d*ord(a>b)); _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/cgi-bin/mailman/listinfo/fpc-pascal
