On 24 February 2013 00:23, Kirk Liberty wrote:
> Hi all,
>
> I'm trying to use g++ to compile a function with optimization O2
> except for one function I want at O3. I'm not having any luck with
> __attribute__ or #pragma. I am using GCC version 4.7.2. With
> __attribute__ I am getting a warning that the directive was ignored,
> and with #pragma I am simply not seeing the speedup expected.
Maybe the optimizer simply doesn't make the code any faster.
> Here's what I've tried.
> bool* getStreamBool(uint64_t num) __attribute__ ((optimize("-O3"))) {...}
I think this should be "O3" or just "3", without the dash.
