Messages in this thread | | | Date | Tue, 3 Mar 2009 09:33:15 +0000 | Subject | Re: [PATCH] crc32: remove useless __pure modifier from functions | From | Will Newton <> |
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On Mon, Mar 2, 2009 at 5:42 PM, Thiago Galesi <thiagogalesi@gmail.com> wrote: >> >> Hmm. They're not marked as pure in the header files. Does GCC look it up >> from the object file or something for this...? > > I just tested this, the answer is No :( > > It only works if it's marked in the header. But when it's marked, it > works, and redundant calls are optimized.
Did you see any change in size of your kernel with this annotation? It didn't seem to have any effect as far as I could tell.
There are a number of functions in lib/ code that could be marked __pure or __attribute_const__ but I'm not sure if it's worth the effort, for my compiler (gcc 4.2) at least.
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