On Monday 16 November 2015 20:20:38 Nicolas Pitre wrote: > Arnd, > > Please pull the following branch: > > git://git.linaro.org/people/nicolas.pitre/linux div64 > > This contains those patches I've initially posted here: > > https://lkml.org/lkml/2015/11/2/715 > > Only changes to those posted patches are cosmetic improvements such as > the use of ilog2() replacing the custom __div64_ffs(). Exposure in > linux-next would be a good thing. > > I also included fixes for a couple do_div() misuses that an allyesconfig > build turned up after switching ARM to the generic do_div() code. > Those patches have been posted separately and addressed to relevant > maintainers. They are included here until/unless those maintainers > include those patches in their tree. > > Original cover letter: > > This is a generalization of the optimization I produced for ARM a decade > ago to turn constant divisors into a multiplication by the divisor > reciprocal. Turns out that after all those years gcc is still not > optimizing things on its own for that case. > > This has important performance benefits as discussed in this thread: > > https://lkml.org/lkml/2015/10/28/851 > > This series brings the formerly ARM-only optimization to all 32-bit > architectures using C code by default. The possibility for the actual > multiplication to be implemented in assembly is provided in order to get > optimal code. The ARM version can be used as an example implementation > for other interested architectures to implement. > Pulled into my asm-generic tree now, it should show up in linux-next tomorrow. Thanks, Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
