[all-commits] [llvm/llvm-project] 57c3fe: [x86] favor vector constant load to avoid GPR to X...

[RotateRight via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 57c3fe76a31663526c78ed6ac3bbb34858c823d2
      https://github.com/llvm/llvm-project/commit/57c3fe76a31663526c78ed6ac3bbb34858c823d2
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2020-05-17 (Sun, 17 May 2020)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/combine-udiv.ll
    M llvm/test/CodeGen/X86/packss.ll
    M llvm/test/CodeGen/X86/pshufb-mask-comments.ll
    M llvm/test/CodeGen/X86/ret-mmx.ll
    M llvm/test/CodeGen/X86/sad.ll
    M llvm/test/CodeGen/X86/srem-seteq-vec-nonsplat.ll
    M llvm/test/CodeGen/X86/urem-seteq-vec-nonsplat.ll
    M llvm/test/CodeGen/X86/vec_set-A.ll
    M llvm/test/CodeGen/X86/vec_shift2.ll
    M llvm/test/CodeGen/X86/vector-lzcnt-128.ll
    M llvm/test/CodeGen/X86/vector-shuffle-256-v32.ll
    M llvm/test/CodeGen/X86/vector-tzcnt-128.ll
    M llvm/test/CodeGen/X86/vmovq.ll

  Log Message:
  -----------
  [x86] favor vector constant load to avoid GPR to XMM transfer

This build vector lowering pattern came up in D79886.
I've tried to limit the improvement to cases where it looks
clearly better to load, but we could remove the 'TODO'
predicates already if we are willing to overlook some
corner cases.

Differential Revision: https://reviews.llvm.org/D80013