llvm/llvm-project
GitHub で見るAMDGPU should implement IR version of isFMAFasterThanFMulAndFAdd
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#108,751 opened on 2024年9月15日
backend:AMDGPUgood first issuemissed-optimization
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説明
TargetLowering has an IR variant of isFMAFasterThanFMulAndFAdd, and AMDGPU does not yet implement it.
As far as I can tell, this is only ever used in target code to implement isProfitableToHoist (e.g. AArch64 here https://github.com/llvm/llvm-project/blob/3ae71d154e5dfb5e5a5d27b3699b27ce2b55f44d/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp#L16086)
So for this to be effective, isProfitableToHoist would also need to be implemented similarly.