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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
//===-- llvm/CodeGen/ExpandISelPseudos.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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// Expand Pseudo-instructions produced by ISel. These are usually to allow
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// the expansion to contain control flow, such as a conditional move
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// implemented with a conditional branch and a phi, or an atomic operation
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// 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 "expand-isel-pseudos"
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namespace {
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class ExpandISelPseudos : public MachineFunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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ExpandISelPseudos() : 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 ExpandISelPseudos::ID = 0;
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char &llvm::ExpandISelPseudosID = ExpandISelPseudos::ID;
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INITIALIZE_PASS(ExpandISelPseudos, DEBUG_TYPE,
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"Expand ISel Pseudo-instructions", false, false)
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bool ExpandISelPseudos::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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return Changed;
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}
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