[all-commits] [llvm/llvm-project] a7b85e: [X86] Freeze shl(x, 1) -> add(x, x) vector fold (PR5...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a7b85e4c0c2d71018949f409ecf47981fe71f3a0
      https://github.com/llvm/llvm-project/commit/a7b85e4c0c2d71018949f409ecf47981fe71f3a0
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2022-08-15 (Mon, 15 Aug 2022)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/combine-mul.ll
    M llvm/test/CodeGen/X86/freeze-binary.ll
    M llvm/test/CodeGen/X86/oddsubvector.ll
    M llvm/test/CodeGen/X86/rotate_vec.ll
    M llvm/test/CodeGen/X86/sdiv_fix_sat.ll
    M llvm/test/CodeGen/X86/udiv_fix_sat.ll
    M llvm/test/CodeGen/X86/vector-fshr-128.ll
    M llvm/test/CodeGen/X86/vector-fshr-256.ll
    M llvm/test/CodeGen/X86/vector-fshr-512.ll
    M llvm/test/CodeGen/X86/vector-fshr-rot-128.ll
    M llvm/test/CodeGen/X86/vector-fshr-rot-256.ll
    M llvm/test/CodeGen/X86/vector-fshr-rot-512.ll
    M llvm/test/CodeGen/X86/vector-mulfix-legalize.ll
    M llvm/test/CodeGen/X86/vector-shift-shl-128.ll
    M llvm/test/CodeGen/X86/vector-shift-shl-256.ll

  Log Message:
  -----------
  [X86] Freeze shl(x,1) -> add(x,x) vector fold (PR50468)

Vector fold shl(x,1) -> add(freeze(x),freeze(x)) to avoid the undef issues identified in PR50468

Differential Revision: https://reviews.llvm.org/D106675