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...form the kind of "ripple up" that you described, eliminating unnecessary register to register copies along the way. -- Christopher Lamb -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20070922/ec16cda1/attachment.html>

On 9/21/07, Christopher Lamb <christopher.lamb at gmail.com> wrote: > ISel patterns are matched against DAGs before register allocation. So you > are correct that ISel patterns can't take into account register classes. The > register classes in the patterns are a selection constraint for the register > allocator if that instruction is chosen, not a constraint on choosing