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2017 Jun 15
2
LLC does not do proper copy propagation (or copy coalescing)
Hello. Could you please tell me how can I optimize with the back end (llc) the following piece of assembly code generated by llc: // NOTE: my processor accepts loops in the form of REPEAT(num_times)..END_REPEAT R0 = ... REPEAT(256) R5 = R0; // basically unnecessary reg. copy REPEAT(256) R10 = LS[R4]; R2 = LS[R5]; R4 =