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634d9abefb
Add a RISC-V assembly language implementation of TCP/IP checksumming, which is around 50x faster than the generic algorithm. The main loop checksums aligned xlen-bit words, using almost entirely compressible instructions and accumulating carries in a separate register to allow folding to be deferred until after all loops have completed. Experimentation on a C910 CPU suggests that this achieves around four bytes per clock cycle, which is comparable to the x86 implementation. Signed-off-by: Michael Brown <mcb30@ipxe.org>