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Hi, Same here, my backend only has 64bit load/store. But i still use 64bit virt regs and expand/declare missing instructions by myself.  I'll try looking into sparc backend, thanks. Also, only after writing this post I found a bunch of built-in transforms. Still trying to understand how to use those. By the way, constraint-wise (alignment), is there any difference between virt regclass and

...s choosen a tuple of machine registers (even though it looks like a single register with funny aliasing as far as llvm codegen is concerned). - Matthias -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20170616/30f9fd06/attachment-0001.html>