[all-commits] [llvm/llvm-project] 6c1fc8: [InstCombine] fold `sub(zext(ptrtoint), zext(ptrtoi...

[Nikolay Panchenko via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6c1fc8213ee40896681ed84a3f91b1b5b56a4de8
      https://github.com/llvm/llvm-project/commit/6c1fc8213ee40896681ed84a3f91b1b5b56a4de8
  Author: Nikolay Panchenko <npanchen at modular.com>
  Date:   2024-11-15 (Fri, 15 Nov 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
    M llvm/test/Transforms/InstCombine/sub-gep.ll

  Log Message:
  -----------
  [InstCombine] fold `sub(zext(ptrtoint),zext(ptrtoint))` (#115369)

On a 32-bit target if pointer arithmetic with `addrspace` is used in i64
computation, the missed folding in InstCombine results to suboptimal
performance, unlike same code compiled for 64bit target.



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