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

[Philip Reames via Phabricator via llvm-commits]

reames added a comment.

In D125552#3512191 <https://reviews.llvm.org/D125552#3512191>, @craig.topper wrote:

> Would llvm.vscale() * 8 have been a good testing hook for vlenb? I imagine that would CSE in SelectionDAG.

vscale is currently lowered to PseudoReadVLENB.  I needed something which bypassed the pseudo to be able to write the COPY from constant physreg cases before replacing the pseudo with the plain copy.


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https://reviews.llvm.org/D125552