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https://github.com/c64scene-ar/llvm-6502.git
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This is more compact and faster than using DenseMap. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128763 91177308-0d34-0410-b5e6-96231b3b80d8
180 lines
5.4 KiB
C++
180 lines
5.4 KiB
C++
//===-- SlotIndexes.cpp - Slot Indexes Pass ------------------------------===//
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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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#define DEBUG_TYPE "slotindexes"
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#include "llvm/CodeGen/SlotIndexes.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetInstrInfo.h"
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using namespace llvm;
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char SlotIndexes::ID = 0;
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INITIALIZE_PASS(SlotIndexes, "slotindexes",
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"Slot index numbering", false, false)
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STATISTIC(NumLocalRenum, "Number of local renumberings");
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STATISTIC(NumGlobalRenum, "Number of global renumberings");
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void SlotIndexes::getAnalysisUsage(AnalysisUsage &au) const {
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au.setPreservesAll();
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MachineFunctionPass::getAnalysisUsage(au);
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}
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void SlotIndexes::releaseMemory() {
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mi2iMap.clear();
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MBBRanges.clear();
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idx2MBBMap.clear();
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clearList();
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}
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bool SlotIndexes::runOnMachineFunction(MachineFunction &fn) {
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// Compute numbering as follows:
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// Grab an iterator to the start of the index list.
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// Iterate over all MBBs, and within each MBB all MIs, keeping the MI
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// iterator in lock-step (though skipping it over indexes which have
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// null pointers in the instruction field).
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// At each iteration assert that the instruction pointed to in the index
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// is the same one pointed to by the MI iterator. This
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// FIXME: This can be simplified. The mi2iMap_, Idx2MBBMap, etc. should
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// only need to be set up once after the first numbering is computed.
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mf = &fn;
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initList();
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// Check that the list contains only the sentinal.
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assert(indexListHead->getNext() == 0 &&
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"Index list non-empty at initial numbering?");
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assert(idx2MBBMap.empty() &&
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"Index -> MBB mapping non-empty at initial numbering?");
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assert(MBBRanges.empty() &&
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"MBB -> Index mapping non-empty at initial numbering?");
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assert(mi2iMap.empty() &&
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"MachineInstr -> Index mapping non-empty at initial numbering?");
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functionSize = 0;
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unsigned index = 0;
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MBBRanges.resize(mf->getNumBlockIDs());
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idx2MBBMap.reserve(mf->size());
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push_back(createEntry(0, index));
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// Iterate over the function.
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for (MachineFunction::iterator mbbItr = mf->begin(), mbbEnd = mf->end();
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mbbItr != mbbEnd; ++mbbItr) {
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MachineBasicBlock *mbb = &*mbbItr;
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// Insert an index for the MBB start.
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SlotIndex blockStartIndex(back(), SlotIndex::LOAD);
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for (MachineBasicBlock::iterator miItr = mbb->begin(), miEnd = mbb->end();
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miItr != miEnd; ++miItr) {
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MachineInstr *mi = miItr;
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if (mi->isDebugValue())
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continue;
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// Insert a store index for the instr.
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push_back(createEntry(mi, index += SlotIndex::InstrDist));
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// Save this base index in the maps.
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mi2iMap.insert(std::make_pair(mi, SlotIndex(back(), SlotIndex::LOAD)));
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++functionSize;
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}
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// We insert one blank instructions between basic blocks.
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push_back(createEntry(0, index += SlotIndex::InstrDist));
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MBBRanges[mbb->getNumber()].first = blockStartIndex;
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MBBRanges[mbb->getNumber()].second = SlotIndex(back(), SlotIndex::LOAD);
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idx2MBBMap.push_back(IdxMBBPair(blockStartIndex, mbb));
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}
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// Sort the Idx2MBBMap
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std::sort(idx2MBBMap.begin(), idx2MBBMap.end(), Idx2MBBCompare());
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DEBUG(dump());
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// And we're done!
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return false;
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}
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void SlotIndexes::renumberIndexes() {
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// Renumber updates the index of every element of the index list.
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DEBUG(dbgs() << "\n*** Renumbering SlotIndexes ***\n");
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++NumGlobalRenum;
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unsigned index = 0;
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for (IndexListEntry *curEntry = front(); curEntry != getTail();
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curEntry = curEntry->getNext()) {
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curEntry->setIndex(index);
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index += SlotIndex::InstrDist;
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}
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}
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// Renumber indexes locally after curEntry was inserted, but failed to get a new
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// index.
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void SlotIndexes::renumberIndexes(IndexListEntry *curEntry) {
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// Number indexes with half the default spacing so we can catch up quickly.
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const unsigned Space = SlotIndex::InstrDist/2;
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assert((Space & 3) == 0 && "InstrDist must be a multiple of 2*NUM");
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IndexListEntry *start = curEntry->getPrev();
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unsigned index = start->getIndex();
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IndexListEntry *tail = getTail();
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do {
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curEntry->setIndex(index += Space);
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curEntry = curEntry->getNext();
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// If the next index is bigger, we have caught up.
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} while (curEntry != tail && curEntry->getIndex() <= index);
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DEBUG(dbgs() << "\n*** Renumbered SlotIndexes " << start->getIndex() << '-'
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<< index << " ***\n");
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++NumLocalRenum;
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}
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void SlotIndexes::dump() const {
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for (const IndexListEntry *itr = front(); itr != getTail();
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itr = itr->getNext()) {
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dbgs() << itr->getIndex() << " ";
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if (itr->getInstr() != 0) {
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dbgs() << *itr->getInstr();
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} else {
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dbgs() << "\n";
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}
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}
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for (unsigned i = 0, e = MBBRanges.size(); i != e; ++i)
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dbgs() << "BB#" << i << "\t[" << MBBRanges[i].first << ';'
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<< MBBRanges[i].second << ")\n";
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}
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// Print a SlotIndex to a raw_ostream.
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void SlotIndex::print(raw_ostream &os) const {
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if (isValid())
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os << entry().getIndex() << "LudS"[getSlot()];
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else
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os << "invalid";
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}
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// Dump a SlotIndex to stderr.
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void SlotIndex::dump() const {
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print(dbgs());
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dbgs() << "\n";
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}
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