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Re: Will Perl 6 optimize away useless assignments?

by RhetTbull (Curate)
on Sep 03, 2001 at 21:01 UTC ( #109896=note: print w/ replies, xml ) Need Help??

in reply to Will Perl 6 optimize away useless assignments?

A problem I see with this is that it's hard for the compiler to know what's a "useless" assignment -- especially with a language as extensible as perl. For example, what if the variable is tied? An assignment that looks useless may do quite a bit. Of course, you could tell the compiler "optimize it away unless it's tied" but there may be other examples where it's hard/impossible to tell. Although I doubt anyone uses perl for embedded work, this sort of thing is definitely an issue for C where a variable might really be a hardware register so an assignment isn't useless at all and is probably necessary. Can anyone think of a perl example other than a tied variable?

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