[all-commits] [llvm/llvm-project] 0819a6: [SelectionDAG] Better legalization for FSHL and FSHR

[jayfoad via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 0819a6416fd217413a1d04e93531db1b30272e9b
      https://github.com/llvm/llvm-project/commit/0819a6416fd217413a1d04e93531db1b30272e9b
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2020-08-21 (Fri, 21 Aug 2020)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeTypes.h
    M llvm/lib/CodeGen/SelectionDAG/LegalizeVectorTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
    M llvm/lib/Target/RISCV/RISCVISelDAGToDAG.h
    M llvm/lib/Target/RISCV/RISCVInstrInfoB.td
    M llvm/test/CodeGen/AArch64/funnel-shift-rot.ll
    M llvm/test/CodeGen/AArch64/funnel-shift.ll
    M llvm/test/CodeGen/AArch64/shift-by-signext.ll
    M llvm/test/CodeGen/AMDGPU/fshl.ll
    M llvm/test/CodeGen/AMDGPU/fshr.ll
    M llvm/test/CodeGen/PowerPC/funnel-shift-rot.ll
    M llvm/test/CodeGen/PowerPC/funnel-shift.ll
    M llvm/test/CodeGen/RISCV/rv32Zbbp.ll
    M llvm/test/CodeGen/RISCV/rv32Zbt.ll
    M llvm/test/CodeGen/RISCV/rv64Zbbp.ll
    M llvm/test/CodeGen/RISCV/rv64Zbt.ll
    M llvm/test/CodeGen/X86/fshl.ll
    M llvm/test/CodeGen/X86/fshr.ll
    M llvm/test/CodeGen/X86/funnel-shift.ll
    M llvm/test/CodeGen/X86/vector-fshl-128.ll
    M llvm/test/CodeGen/X86/vector-fshl-256.ll
    M llvm/test/CodeGen/X86/vector-fshl-512.ll
    M llvm/test/CodeGen/X86/vector-fshl-rot-128.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

  Log Message:
  -----------
  [SelectionDAG] Better legalization for FSHL and FSHR

In SelectionDAGBuilder always translate the fshl and fshr intrinsics to
FSHL and FSHR (or ROTL and ROTR) instead of lowering them to shifts and
ORs. Improve the legalization of FSHL and FSHR to avoid code quality
regressions.

Differential Revision: https://reviews.llvm.org/D77152