[PATCH] D125552: [RISCV] Add llvm.read.register support for vlenb

[Philip Reames via Phabricator via llvm-commits]

reames added a comment.

In D125552#3511820 <https://reviews.llvm.org/D125552#3511820>, @craig.topper wrote:

> Should we eventually implement something like AArch64DAGToDAGISel::tryReadRegister?

I think that basically comes down to a question of whether we think having the ccsr exposed earlier than COPY elimination is helpful.  I don't currently have a strong opinion on that, but would lean towards using the generic COPY through optimization.


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