[all-commits] [llvm/llvm-project] d58512: [SLP] Don't vectorize stores of non-packed types (...

[Björn Pettersson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d58512b2e31a255dccc2c9a351a4e47b2b4c9f79
      https://github.com/llvm/llvm-project/commit/d58512b2e31a255dccc2c9a351a4e47b2b4c9f79
  Author: Bjorn Pettersson <bjorn.a.pettersson at ericsson.com>
  Date:   2021-01-14 (Thu, 14 Jan 2021)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/X86/bad_types.ll

  Log Message:
  -----------
  [SLP] Don't vectorize stores of non-packed types (like i1, i2)

In the spirit of commit fc783e91e0c0696e (llvm-svn: 248943) we
shouldn't vectorize stores of non-packed types (i.e. types that
has padding between consecutive variables in a scalar layout,
but being packed in a vector layout).

The problem was detected as a miscompile in a downstream test case.

Reviewed By: anton-afanasyev

Differential Revision: https://reviews.llvm.org/D94446