[X86][SSE] getFauxShuffleMask - handle OR(x,y) where x and y have no overlapping bits

Create a per-byte shuffle mask based on the computeKnownBits from each operand - if for each byte we have a known zero (or both) then it can be safely blended.

Fixes PR41545

llvm-svn: 364458
2 files changed
tree: e91643d29117ce68c4cfe94d40204ef5167acda7
  1. .arcconfig
  2. .clang-format
  3. .clang-tidy
  4. .github/
  5. .gitignore
  6. README.md
  7. clang-tools-extra/
  8. clang/
  9. compiler-rt/
  10. debuginfo-tests/
  11. libclc/
  12. libcxx/
  13. libcxxabi/
  14. libunwind/
  15. lld/
  16. lldb/
  17. llgo/
  18. llvm/
  19. openmp/
  20. parallel-libs/
  21. polly/
  22. pstl/
README.md

The LLVM Compiler Infrastructure

This directory and its subdirectories contain source code for LLVM, a toolkit for the construction of highly optimized compilers, optimizers, and runtime environments.