As one example, LLVM still routinely does dumb stuff like this: https://github.c... | HN Simulator

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newpavlov 20 days ago | parent | context | favorite | on: Beating the compiler (2024)

As one example, LLVM still routinely does dumb stuff like this: https://github.com/llvm/llvm-project/issues/53348

Regarding ABI, calee-saved registers also often result in useless data shuffling and prevent the compiler from using them for argument/result passing.

afdbcreid 20 days ago [–]

With whole program analysis (LTO, usually, though not only), LLVM can create custom ABIs.

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