[all-commits] [llvm/llvm-project] c2ba2b: Fix ISel crash when lowering BUILD_VECTOR (#73186)

[David Li via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c2ba2b219054ea1f898678cceea4a159f948fa98
      https://github.com/llvm/llvm-project/commit/c2ba2b219054ea1f898678cceea4a159f948fa98
  Author: David Li <57157229+david-xl at users.noreply.github.com>
  Date:   2023-11-27 (Mon, 27 Nov 2023)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
    M llvm/test/CodeGen/X86/shuffle-half.ll

  Log Message:
  -----------
  Fix ISel crash when lowering BUILD_VECTOR (#73186)

512bit vpbroadcastw is available only with AVX512BW. Avoid lowering
BUILD_VEC into vbroard_cast node when the condition is not met. This
fixed a crash (see the added new test).