[all-commits] [llvm/llvm-project] 50aacb: [InstCombine] Support ptrtoint of gep folds for ch...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 50aacb9e1b51811f12cb017719678962411c50dd
      https://github.com/llvm/llvm-project/commit/50aacb9e1b51811f12cb017719678962411c50dd
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2025-04-28 (Mon, 28 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineInternal.h
    M llvm/test/Transforms/InstCombine/cast_ptr.ll

  Log Message:
  -----------
  [InstCombine] Support ptrtoint of gep folds for chain of geps (#137323)

Support the ptrtoint(gep null, x) -> x and ptrtoint(gep inttoptr(x), y)
-> x+y folds for the case where there is a chain of geps that ends in
null or inttoptr. This avoids some regressions from #137297.
    
While here, also be a bit more careful about edge cases like pointer to
vector splats and mismatched pointer and index size.



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