[PATCH] D128599: [RISCV] Teach RISCVMergeBaseOffset to handle read-modify-write of a global.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
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The pass was previously limited to LUI+ADDI being used by a single
instruction.

This patch allows the pass to optimize multiple memory operations
that use the same offset. Each of them will receive a separate %lo
relocation. My main motivation is to handle a read-modify-write
where we have a load and store to the same address, but I didn't
restrict it to that case.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128599

Files:
  llvm/lib/Target/RISCV/RISCVMergeBaseOffset.cpp
  llvm/test/CodeGen/RISCV/hoist-global-addr-base.ll

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