forked from OSchip/llvm-project
77 lines
2.6 KiB
C++
77 lines
2.6 KiB
C++
//===-- llvm/CodeGen/FinalizeISel.cpp ---------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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/// This pass expands Pseudo-instructions produced by ISel, fixes register
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/// reservations and may do machine frame information adjustments.
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/// The pseudo instructions are used to allow the expansion to contain control
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/// flow, such as a conditional move implemented with a conditional branch and a
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/// phi, or an atomic operation implemented with a loop.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionPass.h"
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#include "llvm/CodeGen/Passes.h"
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#include "llvm/CodeGen/TargetLowering.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/Support/Debug.h"
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using namespace llvm;
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#define DEBUG_TYPE "finalize-isel"
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namespace {
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class FinalizeISel : public MachineFunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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FinalizeISel() : MachineFunctionPass(ID) {}
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private:
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bool runOnMachineFunction(MachineFunction &MF) override;
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void getAnalysisUsage(AnalysisUsage &AU) const override {
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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};
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} // end anonymous namespace
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char FinalizeISel::ID = 0;
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char &llvm::FinalizeISelID = FinalizeISel::ID;
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INITIALIZE_PASS(FinalizeISel, DEBUG_TYPE,
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"Finalize ISel and expand pseudo-instructions", false, false)
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bool FinalizeISel::runOnMachineFunction(MachineFunction &MF) {
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bool Changed = false;
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const TargetLowering *TLI = MF.getSubtarget().getTargetLowering();
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// Iterate through each instruction in the function, looking for pseudos.
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for (MachineFunction::iterator I = MF.begin(), E = MF.end(); I != E; ++I) {
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MachineBasicBlock *MBB = &*I;
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for (MachineBasicBlock::iterator MBBI = MBB->begin(), MBBE = MBB->end();
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MBBI != MBBE; ) {
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MachineInstr &MI = *MBBI++;
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// If MI is a pseudo, expand it.
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if (MI.usesCustomInsertionHook()) {
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Changed = true;
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MachineBasicBlock *NewMBB = TLI->EmitInstrWithCustomInserter(MI, MBB);
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// The expansion may involve new basic blocks.
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if (NewMBB != MBB) {
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MBB = NewMBB;
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I = NewMBB->getIterator();
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MBBI = NewMBB->begin();
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MBBE = NewMBB->end();
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}
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}
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}
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}
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TLI->finalizeLowering(MF);
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return Changed;
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}
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