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Using -O3 optimization level rather than -Os results in a large speed-up for a minor code size increase for the RSA code with our current GCC toolchain. Add the CONFIG_RSA_OPTIMIZED option to do it on platforms which are not too size-constrained. On cortex-M4 based STM32L432, I'm measuring a 37 to 40% speed increase (depending on CPU frequency) for a 200 bytes code size delta. Signed-off-by: Vincent Palatin <vpalatin@chromium.org> BRANCH=none BUG=none TEST=manual: benchmark RSA2048 with F4 exponent on STM32L432: -Os -O3 @16Mhz 185163 us --> 111942 us @80Mhz 39286 us --> 24582 us Change-Id: I8c2e4b757f037f4f645fb73ba0faaaa471b24896 Reviewed-on: https://chromium-review.googlesource.com/445218 Commit-Ready: Vincent Palatin <vpalatin@chromium.org> Tested-by: Vincent Palatin <vpalatin@chromium.org> Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
For an overview of the Embedded Controller firmware, refer to http://www.chromium.org/chromium-os/2014-firmware-summit For instructions on building from source, refer to http://www.chromium.org/chromium-os/ec-development/getting-started-building-ec-images-quickly