On Thu, 2014-11-06 at 21:00 -0800, Matt Turner wrote: > On Thu, Nov 6, 2014 at 8:56 PM, Siavash Eliasi < > siavashser...@gmail.com> wrote: > > Then I do recommend removing the "if (cpu_has_sse4_1)" from this > > patch and similar places, because there is no runtime CPU > > dispatching happening for SSE optimized code paths in action and > > just adds extra overhead (unnecessary branches) to the generated > > code. > > No. Sorry, I realize I misread your previous question: > > > > I guess checking for "cpu_has_sse4_1" is unnecessary if it isn't > > > controllable by user at runtime; because "USE_SSE41" is a > > > compile time check and requires the target machine to be SSE 4.1 > > > capable already. > > USE_SSE41 is set if the *compiler* supports SSE 4.1. This allows you > to build the code and then use it only on systems that actually > support it. > > All of this could have been pretty easily answered by a few greps > though...
I wonder what difference it would make to have an option to compile out the run-time check code to avoid the additional overhead in cases where the builder *knows* at compile time what the run-time system is? (ie Gentoo)
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