[all-commits] [llvm/llvm-project] 019049: [ConstraintElim] Use MulOverflow to avoid UB on si...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 019049a1caf2d2057a1248ed61c9e178d1027971
      https://github.com/llvm/llvm-project/commit/019049a1caf2d2057a1248ed61c9e178d1027971
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2022-10-13 (Thu, 13 Oct 2022)

  Changed paths:
    M llvm/lib/Transforms/Scalar/ConstraintElimination.cpp

  Log Message:
  -----------
  [ConstraintElim] Use MulOverflow to avoid UB on signed overflow.

This fixes an UBSan failure after 359bc5c541ae. For inbounds GEP with
index sizes <= 64, having the coefficients overflowing is fine.