[PATCH] D95741: [RISCV] Optimize sign-extended EXTRACT_VECTOR_ELT nodes

[Fraser Cormack via Phabricator via llvm-commits]

frasercrmck added a comment.

In D95741#2532351 <https://reviews.llvm.org/D95741#2532351>, @craig.topper wrote:

> Would it still work if we let scalar types promote using the default type legalization and instead just Custom handle the vector type and change the opcode from LegalizeDAG?

>From what I could see, no: the type-legalized `sign_extend_inreg` node is expanded to `shl/sra` before the `extract_vector_elt` node. I think at that point we're unable to do much. Does that sound reasonable to you?


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