1320374Sdim//===- ARMMacroFusion.cpp - ARM Macro Fusion ----------------------===// 2320374Sdim// 3353358Sdim// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4353358Sdim// See https://llvm.org/LICENSE.txt for license information. 5353358Sdim// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6320374Sdim// 7320374Sdim//===----------------------------------------------------------------------===// 8320374Sdim// 9320374Sdim/// \file This file contains the ARM implementation of the DAG scheduling 10320374Sdim/// mutation to pair instructions back to back. 11320374Sdim// 12320374Sdim//===----------------------------------------------------------------------===// 13320374Sdim 14320374Sdim#include "ARMMacroFusion.h" 15320374Sdim#include "ARMSubtarget.h" 16320374Sdim#include "llvm/CodeGen/MacroFusion.h" 17327952Sdim#include "llvm/CodeGen/TargetInstrInfo.h" 18320374Sdim 19320374Sdimnamespace llvm { 20320374Sdim 21341825Sdim// Fuse AES crypto encoding or decoding. 22341825Sdimstatic bool isAESPair(const MachineInstr *FirstMI, 23341825Sdim const MachineInstr &SecondMI) { 24341825Sdim // Assume the 1st instr to be a wildcard if it is unspecified. 25344779Sdim switch(SecondMI.getOpcode()) { 26341825Sdim // AES encode. 27341825Sdim case ARM::AESMC : 28344779Sdim return FirstMI == nullptr || FirstMI->getOpcode() == ARM::AESE; 29341825Sdim // AES decode. 30341825Sdim case ARM::AESIMC: 31344779Sdim return FirstMI == nullptr || FirstMI->getOpcode() == ARM::AESD; 32341825Sdim } 33341825Sdim 34341825Sdim return false; 35341825Sdim} 36341825Sdim 37341825Sdim// Fuse literal generation. 38341825Sdimstatic bool isLiteralsPair(const MachineInstr *FirstMI, 39341825Sdim const MachineInstr &SecondMI) { 40341825Sdim // Assume the 1st instr to be a wildcard if it is unspecified. 41344779Sdim if ((FirstMI == nullptr || FirstMI->getOpcode() == ARM::MOVi16) && 42344779Sdim SecondMI.getOpcode() == ARM::MOVTi16) 43341825Sdim return true; 44341825Sdim 45341825Sdim return false; 46341825Sdim} 47341825Sdim 48341825Sdim/// Check if the instr pair, FirstMI and SecondMI, should be fused 49320374Sdim/// together. Given SecondMI, when FirstMI is unspecified, then check if 50320374Sdim/// SecondMI may be part of a fused pair at all. 51320374Sdimstatic bool shouldScheduleAdjacent(const TargetInstrInfo &TII, 52320374Sdim const TargetSubtargetInfo &TSI, 53320374Sdim const MachineInstr *FirstMI, 54320374Sdim const MachineInstr &SecondMI) { 55320374Sdim const ARMSubtarget &ST = static_cast<const ARMSubtarget&>(TSI); 56320374Sdim 57341825Sdim if (ST.hasFuseAES() && isAESPair(FirstMI, SecondMI)) 58341825Sdim return true; 59341825Sdim if (ST.hasFuseLiterals() && isLiteralsPair(FirstMI, SecondMI)) 60341825Sdim return true; 61320374Sdim 62320374Sdim return false; 63320374Sdim} 64320374Sdim 65320374Sdimstd::unique_ptr<ScheduleDAGMutation> createARMMacroFusionDAGMutation () { 66320374Sdim return createMacroFusionDAGMutation(shouldScheduleAdjacent); 67320374Sdim} 68320374Sdim 69320374Sdim} // end namespace llvm 70