[llvm] [RISCV] Fix musttail with indirect arguments by forwarding incoming pointers (PR #185094)

[Xavier Roche via llvm-commits]

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xroche wrote:

Thanks for the feedback ! I rebased on post-revert main. The indirect arg forwarding now uses virtual registers instead of SDValues; I did not include the byval/sret re-implementation (from the reverted #170547) as this is a separate issue; should I make a follow-up ?

https://github.com/llvm/llvm-project/pull/185094