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79 lines
2.9 KiB
C++
79 lines
2.9 KiB
C++
//===-- llvm/CodeGen/GlobalISel/MachineLegalizePass.cpp -------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// \file This file implements the LegalizeHelper class to legalize individual
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/// instructions and the MachineLegalizePass wrapper pass for the primary
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/// legalization.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/GlobalISel/MachineLegalizePass.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/GlobalISel/MachineLegalizeHelper.h"
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#include "llvm/CodeGen/GlobalISel/MachineLegalizer.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Target/TargetSubtargetInfo.h"
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#define DEBUG_TYPE "legalize-mir"
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using namespace llvm;
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char MachineLegalizePass::ID = 0;
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INITIALIZE_PASS(MachineLegalizePass, DEBUG_TYPE,
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"Legalize the Machine IR a function's Machine IR", false,
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false)
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MachineLegalizePass::MachineLegalizePass() : MachineFunctionPass(ID) {
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initializeMachineLegalizePassPass(*PassRegistry::getPassRegistry());
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}
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void MachineLegalizePass::init(MachineFunction &MF) {
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}
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bool MachineLegalizePass::runOnMachineFunction(MachineFunction &MF) {
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DEBUG(dbgs() << "Legalize Machine IR for: " << MF.getName() << '\n');
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init(MF);
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const MachineLegalizer &Legalizer = *MF.getSubtarget().getMachineLegalizer();
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MachineLegalizeHelper Helper(MF);
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// FIXME: an instruction may need more than one pass before it is legal. For
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// example on most architectures <3 x i3> is doubly-illegal. It would
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// typically proceed along a path like: <3 x i3> -> <3 x i8> -> <8 x i8>. We
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// probably want a worklist of instructions rather than naive iterate until
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// convergence for performance reasons.
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bool Changed = false;
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MachineBasicBlock::iterator NextMI;
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for (auto &MBB : MF)
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for (auto MI = MBB.begin(); MI != MBB.end(); MI = NextMI) {
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// Get the next Instruction before we try to legalize, because there's a
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// good chance MI will be deleted.
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NextMI = std::next(MI);
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// Only legalize pre-isel generic instructions: others don't have types
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// and are assumed to be legal.
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if (!isPreISelGenericOpcode(MI->getOpcode()))
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continue;
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auto Res = Helper.legalizeInstr(*MI, Legalizer);
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// Error out if we couldn't legalize this instruction. We may want to fall
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// back to DAG ISel instead in the future.
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if (Res == MachineLegalizeHelper::UnableToLegalize) {
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std::string Msg;
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raw_string_ostream OS(Msg);
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OS << "unable to legalize instruction: ";
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MI->print(OS);
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report_fatal_error(OS.str());
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}
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Changed |= Res == MachineLegalizeHelper::Legalized;
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}
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return Changed;
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}
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