[all-commits] [llvm/llvm-project] 02e56e: [CodeGen] Generate efficient assembly for freeze(p...

[Juneyoung Lee via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 02e56e2533027833ff2ca0042fae9cfaa2d85aa6
      https://github.com/llvm/llvm-project/commit/02e56e2533027833ff2ca0042fae9cfaa2d85aa6
  Author: aqjune <aqjune at gmail.com>
  Date:   2022-08-11 (Thu, 11 Aug 2022)

  Changed paths:
    M llvm/include/llvm/CodeGen/SelectionDAGNodes.h
    M llvm/include/llvm/Target/TargetSelectionDAG.td
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/lib/Target/X86/X86InstrVecCompiler.td
    M llvm/test/CodeGen/X86/avx-intrinsics-fast-isel.ll
    M llvm/test/CodeGen/X86/avx-intrinsics-x86.ll
    M llvm/test/CodeGen/X86/avx512-intrinsics.ll
    M llvm/test/CodeGen/X86/avx512fp16-intrinsics.ll

  Log Message:
  -----------
  [CodeGen] Generate efficient assembly for freeze(poison) version of `mm*_cast*` intel intrinsics

This patch makes the variants of `mm*_cast*` intel intrinsics that use `shufflevector(freeze(poison), ..)` emit efficient assembly.
(These intrinsics are planned to use `shufflevector(freeze(poison), ..)` after shufflevector's semantics update; relevant thread: D103874)

To do so, this patch

1. Updates `LowerAVXCONCAT_VECTORS` in X86ISelLowering.cpp to recognize `FREEZE(UNDEF)` operand of `CONCAT_VECTOR` in addition to `UNDEF`
2. Updates X86InstrVecCompiler.td to recognize `insert_subvector` of `FREEZE(UNDEF)` vector as its first operand.

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D130339