117 lines
4.0 KiB
C++
117 lines
4.0 KiB
C++
//===- MachineLoopRanges.cpp - Ranges of machine loops --------------------===//
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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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// This file provides the implementation of the MachineLoopRanges analysis.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineLoopRanges.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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#include "llvm/CodeGen/Passes.h"
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using namespace llvm;
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char MachineLoopRanges::ID = 0;
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INITIALIZE_PASS_BEGIN(MachineLoopRanges, "machine-loop-ranges",
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"Machine Loop Ranges", true, true)
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INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
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INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
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INITIALIZE_PASS_END(MachineLoopRanges, "machine-loop-ranges",
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"Machine Loop Ranges", true, true)
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char &llvm::MachineLoopRangesID = MachineLoopRanges::ID;
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void MachineLoopRanges::getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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AU.addRequiredTransitive<SlotIndexes>();
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AU.addRequiredTransitive<MachineLoopInfo>();
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MachineFunctionPass::getAnalysisUsage(AU);
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}
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/// runOnMachineFunction - Don't do much, loop ranges are computed on demand.
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bool MachineLoopRanges::runOnMachineFunction(MachineFunction &) {
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releaseMemory();
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Indexes = &getAnalysis<SlotIndexes>();
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return false;
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}
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void MachineLoopRanges::releaseMemory() {
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DeleteContainerSeconds(Cache);
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Cache.clear();
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}
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MachineLoopRange *MachineLoopRanges::getLoopRange(const MachineLoop *Loop) {
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MachineLoopRange *&Range = Cache[Loop];
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if (!Range)
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Range = new MachineLoopRange(Loop, Allocator, *Indexes);
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return Range;
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}
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/// Create a MachineLoopRange, only accessible to MachineLoopRanges.
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MachineLoopRange::MachineLoopRange(const MachineLoop *loop,
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MachineLoopRange::Allocator &alloc,
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SlotIndexes &Indexes)
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: Loop(loop), Intervals(alloc), Area(0) {
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// Compute loop coverage.
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for (MachineLoop::block_iterator I = Loop->block_begin(),
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E = Loop->block_end(); I != E; ++I) {
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const std::pair<SlotIndex, SlotIndex> &Range = Indexes.getMBBRange(*I);
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Intervals.insert(Range.first, Range.second, 1u);
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Area += Range.first.distance(Range.second);
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}
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}
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/// overlaps - Return true if this loop overlaps the given range of machine
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/// instructions.
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bool MachineLoopRange::overlaps(SlotIndex Start, SlotIndex Stop) {
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Map::const_iterator I = Intervals.find(Start);
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return I.valid() && Stop > I.start();
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}
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unsigned MachineLoopRange::getNumber() const {
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return Loop->getHeader()->getNumber();
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}
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/// byNumber - Comparator for array_pod_sort that sorts a list of
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/// MachineLoopRange pointers by number.
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int MachineLoopRange::byNumber(const void *pa, const void *pb) {
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const MachineLoopRange *a = *static_cast<MachineLoopRange *const *>(pa);
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const MachineLoopRange *b = *static_cast<MachineLoopRange *const *>(pb);
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unsigned na = a->getNumber();
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unsigned nb = b->getNumber();
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if (na < nb)
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return -1;
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if (na > nb)
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return 1;
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return 0;
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}
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/// byAreaDesc - Comparator for array_pod_sort that sorts a list of
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/// MachineLoopRange pointers by:
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/// 1. Descending area.
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/// 2. Ascending number.
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int MachineLoopRange::byAreaDesc(const void *pa, const void *pb) {
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const MachineLoopRange *a = *static_cast<MachineLoopRange *const *>(pa);
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const MachineLoopRange *b = *static_cast<MachineLoopRange *const *>(pb);
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if (a->getArea() != b->getArea())
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return a->getArea() > b->getArea() ? -1 : 1;
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return byNumber(pa, pb);
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}
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void MachineLoopRange::print(raw_ostream &OS) const {
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OS << "Loop#" << getNumber() << " =";
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for (Map::const_iterator I = Intervals.begin(); I.valid(); ++I)
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OS << " [" << I.start() << ';' << I.stop() << ')';
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}
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raw_ostream &llvm::operator<<(raw_ostream &OS, const MachineLoopRange &MLR) {
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MLR.print(OS);
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return OS;
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}
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