Re: Possible ANSI C Optimisation Done in Practice?

Hi,


> Some compilers will replace calls to functions such as 'strlen()'
> with in-line code. In such a case, the optimization phase isn't even
> aware that 'strlen()' is being called. It simply optimizes the
> in-line code as if the programmer had written it that way.


Agreed, but that doesn't change my question. Either the compiler
*knows* what strlen is and that it is pure, or in addition replaces the
call to strlen with inline code. That still leaves the compiler to
determine that modifying *t doesn't affect s so the strlen call, or its
equivalent inline code, is invariant to the loop.


Cheers,


Ralph.

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