[PATCH] D105614: [RISCV][test] Add new tests for mul optimization in the zba extension with SH*ADD

[Ben Shi via Phabricator via llvm-commits]

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This patch does the following optimization.

(mul x imm) -> (SH1ADD x, (SLLI x, bits)) when imm = 2^n + 2.
(mul x imm) -> (SH2ADD x, (SLLI x, bits)) when imm = 2^n + 4.
(mul x imm) -> (SH3ADD x, (SLLI x, bits)) when imm = 2^n + 8.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D105614

Files:
  llvm/test/CodeGen/RISCV/rv32zba.ll
  llvm/test/CodeGen/RISCV/rv64zba.ll

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