[PATCH] D120648: [RISCV] DAGcombine fold (bswap(srl (bswap c), x)) -> (shl c, x)

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

We'd probably do better with a smaller match/fold. This is really just recognizing that you can move a logical shift before/after a swap by reversing the direction. We don't get this in IR either if I'm seeing it correctly:
https://alive2.llvm.org/ce/z/2UmMSu


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https://reviews.llvm.org/D120648