[all-commits] [llvm/llvm-project] ce066d: [BasicAA] Make sure types match in constant offset...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ce066da81c3e6175a02fa7ae831931b5e4126a2b
      https://github.com/llvm/llvm-project/commit/ce066da81c3e6175a02fa7ae831931b5e4126a2b
  Author: Nikita Popov <nikita.ppv at gmail.com>
  Date:   2021-03-28 (Sun, 28 Mar 2021)

  Changed paths:
    M llvm/lib/Analysis/BasicAliasAnalysis.cpp
    M llvm/test/Analysis/BasicAA/q.bad.ll

  Log Message:
  -----------
  [BasicAA] Make sure types match in constant offset heuristic

This can only happen if offset types that are larger than the
pointer size are involved. The previous implementation did not
assert in this case because it initialized the APInts to the
width of one of the variables -- though I strongly suspect it
did not compute correct results in this case.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=32621
reported by fhahn.