[all-commits] [llvm/llvm-project] 80a0dc: [X86][AVX] computeKnownBitsForTargetNode - add VTR...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 80a0dc59b7a42561ac487d7e590853905164ce23
      https://github.com/llvm/llvm-project/commit/80a0dc59b7a42561ac487d7e590853905164ce23
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2020-08-19 (Wed, 19 Aug 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/avx512vl-intrinsics-fast-isel.ll
    M llvm/test/CodeGen/X86/shuffle-vs-trunc-256.ll
    M llvm/test/CodeGen/X86/shuffle-vs-trunc-512.ll

  Log Message:
  -----------
  [X86][AVX] computeKnownBitsForTargetNode - add VTRUNC/VTRUNCS/VTRUNCUS known zero upper elements handling.

Like many of the AVX512 conversion ops, the VTRUNC ops guarantee the upper destination elements are zero.