[llvm-dev] [flang-dev] MLIR for clang (original) (raw)

Michael Kruse via llvm-dev llvm-dev at lists.llvm.org
Mon Feb 17 15:03:57 PST 2020

Am Mo., 17. Feb. 2020 um 10:58 Uhr schrieb Prashanth N R <prashanth.nr at gmail.com>:

1. We intent to fork clang for MLIR at a particular release and develop. We will mostly merge with the master as soon as we reach a good milestones. Most of the development is expected to happen in github or some such version control system.

Once you did the conversion, I think it becomes unfeasible to merge in LLVM master on a regular basis. For instance, you will have changed every occurrence of llvm::Instruction to mlir::Operation and its API, affecting about every line of code starting with clangCodeGen. Even if you introduce compatibility layer, upstream LLVM will continue to use llvm::Instruction.

Another case is MLIR's use of BasicBlock arguments instead of PHINode. This is a change we potentially would want in LLVM as well, but would require every line that assumes PHI nodes at once, so has not been done yet.

Michael

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