1 //===- ARMMacroFusion.cpp - ARM Macro Fusion ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 /// \file This file contains the ARM implementation of the DAG scheduling
11 /// mutation to pair instructions back to back.
13 //===----------------------------------------------------------------------===//
15 #include "ARMMacroFusion.h"
16 #include "ARMSubtarget.h"
17 #include "llvm/CodeGen/MacroFusion.h"
18 #include "llvm/CodeGen/TargetInstrInfo.h"
22 /// \brief Check if the instr pair, FirstMI and SecondMI, should be fused
23 /// together. Given SecondMI, when FirstMI is unspecified, then check if
24 /// SecondMI may be part of a fused pair at all.
25 static bool shouldScheduleAdjacent(const TargetInstrInfo &TII,
26 const TargetSubtargetInfo &TSI,
27 const MachineInstr *FirstMI,
28 const MachineInstr &SecondMI) {
29 const ARMSubtarget &ST = static_cast<const ARMSubtarget&>(TSI);
31 // Assume wildcards for unspecified instrs.
32 unsigned FirstOpcode =
33 FirstMI ? FirstMI->getOpcode()
34 : static_cast<unsigned>(ARM::INSTRUCTION_LIST_END);
35 unsigned SecondOpcode = SecondMI.getOpcode();
38 // Fuse AES crypto operations.
39 switch(SecondOpcode) {
42 return FirstOpcode == ARM::AESE ||
43 FirstOpcode == ARM::INSTRUCTION_LIST_END;
46 return FirstOpcode == ARM::AESD ||
47 FirstOpcode == ARM::INSTRUCTION_LIST_END;
53 std::unique_ptr<ScheduleDAGMutation> createARMMacroFusionDAGMutation () {
54 return createMacroFusionDAGMutation(shouldScheduleAdjacent);
57 } // end namespace llvm