Alex Bradbury 71a977d0d6 [RISCV] Add shift-add (SH1ADD, ...) to isCopyInstrImpl (#133443) ...

As with #132002, these do show up in a compilation of llvm-test-suite
(including SPEC 2017). We remove 30-40 static instances so this isn't
anything earth shattering.

rs2 is always added to the other shifted (and potentially extended)
operand unmodified, so rs1==zero is equivalent to a copy.

2025-03-28 15:46:50 +00:00

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