[cfe-dev] Setting readnone attribute for function declaration

[ihusar at fit.vutbr.cz]

At 27.08.2010, 18:06, wrote Chris Lattner <clattner at apple.com>:

>
> On Aug 27, 2010, at 7:17 AM, ihusar wrote:
>
>> Hello,
>>
>>   I would like to ask, if there is a way how to set  readnone attribute for a function declaration.
>> (http://llvm.org/docs/LangRef.html#fnattrs)
>>
>> Lets say I would like to have such function:
>>
>> short __attribute__((readnone)) fun(short a, short b, int c);
>>
>> However, the clang frontend (v.1.0), does print a warning, that the readnone attribute is ignored.
>> I looked in the newest revision sources, but it does not seem that it is supported either.
>> Do you know whether it is possible to convince the frontend, that this function should have the
>> readnone attribute (I need this to allow optimizations over this function call boundary to happen)?
>
> In C code, we follow the GCC naming of the attributes, so readnone = attribute(const) and readonly = attribute(pure).
>
> -Chris
>


It works perfectly, thank you for your answer.
   Adam H.