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Hi all, A bunch of us met at EuroLLVM to discuss the planned merge of the two current AArch64 backends in the tree. The primary question was which backend should form the basis of the merge (since the core .td files aren't directly mergeable), with code being cherry-picked from the other on a case-by-case basis. There were factors to consider both ways, but I think the key points of interest

...gressions. It should be > recognized that this is a special situation as there are commercial > releases being made on the two backends, and for adoption of the merge > it is critical that there are no regressions. Examples of tests are: > SPEC2000, SPEC2006, EEMBC, Geekbench, Coremark, MCHammer, Emperor > (NEON) > > - Performance - Difficult to have precise and fixed baseline for > measuring performance regressions on the merged backends because of > variability in hardware, but all significant performance regressions > must be investigated and justified as fix/notfix &...