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...UBVECTORs and BUILD_VECTORs seem to be handled on ARM mainly by resorting to the stack, which often leads to rather bad code. EXTRACT_SUBVECTOR in particular should just involve ignoring one of the registers. I've put together a couple of patches to improve matters: http://www.maths.ed.ac.uk/~s0677366/build_vector.patch http://www.maths.ed.ac.uk/~s0677366/extract_subvector.patch (both were originally created a couple of weeks ago so the offsets have changed slightly, they're still valid on today's trunk). extract_subvector.patch adds "Pat"s to the relevant .td file so that EX...