Re: Function specific optimizations call for discussion

[Sylvain Pion <Sylvain dot Pion at sophia dot inria dot fr>]

Michael Meissner a écrit :
> One of the things that I've been interested in is adding support to GCC to
> compile individual functions with specific target options.  I first presented a
> draft at the Google mini-summit, and then another draft at the GCC developer
> summit last July.
>
> In the x86 world this would mean saying that an individual function can use
> SSE5 instructions or SSE4.1 instructions.  This would simplify things for
> people who need to write high performance libraries that run on different
> architectures, and need to be optimal on each platform.  Ultimately, the goal
> is to allow hotspot functions to be compiled several times with different
> target specific optimizations.  I would welcome any thoughts or suggestions
> about this proposal.

I'm wondering if this proposal would support specifying things
like adding -frounding-math when compiling specific functions.
( This particular case is connected to pragma FENV_ACCESS though. )

Also, would this work when the functions is inline?
I mean the case when the caller does not have the same attribute,
but the inlined code of the callee still respects the attribute
set for the inlined callee.

--
Sylvain Pion
INRIA Sophia-Antipolis
Geometrica Project-Team
CGAL, http://cgal.org/

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