2014-04-11 23:20:58 +00:00
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//===- MachineBlockFrequencyInfo.cpp - MBB Frequency Analysis -------------===//
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2011-07-16 20:23:20 +00:00
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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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// Loops should be simplified before this analysis.
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//
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//===----------------------------------------------------------------------===//
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2011-07-25 19:25:40 +00:00
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#include "llvm/CodeGen/MachineBlockFrequencyInfo.h"
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2017-08-24 21:21:39 +00:00
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/None.h"
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#include "llvm/ADT/iterator.h"
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2014-04-11 23:20:58 +00:00
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#include "llvm/Analysis/BlockFrequencyInfoImpl.h"
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2017-08-24 21:21:39 +00:00
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#include "llvm/CodeGen/MachineBasicBlock.h"
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2011-07-16 20:23:20 +00:00
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#include "llvm/CodeGen/MachineBranchProbabilityInfo.h"
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2014-04-21 17:57:07 +00:00
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineLoopInfo.h"
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2017-08-24 21:21:39 +00:00
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#include "llvm/Pass.h"
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2013-12-03 00:49:33 +00:00
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/GraphWriter.h"
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2017-08-24 21:21:39 +00:00
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#include <string>
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2011-07-16 20:23:20 +00:00
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using namespace llvm;
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2017-05-25 21:26:32 +00:00
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#define DEBUG_TYPE "machine-block-freq"
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2014-04-22 02:02:50 +00:00
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2016-06-21 23:36:12 +00:00
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static cl::opt<GVDAGType> ViewMachineBlockFreqPropagationDAG(
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"view-machine-block-freq-propagation-dags", cl::Hidden,
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cl::desc("Pop up a window to show a dag displaying how machine block "
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"frequencies propagate through the CFG."),
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cl::values(clEnumValN(GVDT_None, "none", "do not display graphs."),
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clEnumValN(GVDT_Fraction, "fraction",
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"display a graph using the "
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"fractional block frequency representation."),
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clEnumValN(GVDT_Integer, "integer",
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"display a graph using the raw "
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"integer fractional block frequency representation."),
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2016-06-22 19:26:44 +00:00
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clEnumValN(GVDT_Count, "count", "display a graph using the real "
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2016-10-08 19:41:06 +00:00
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"profile count if available.")));
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2017-08-24 21:21:39 +00:00
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2017-01-29 01:57:02 +00:00
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// Similar option above, but used to control BFI display only after MBP pass
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cl::opt<GVDAGType> ViewBlockLayoutWithBFI(
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"view-block-layout-with-bfi", cl::Hidden,
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cl::desc(
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"Pop up a window to show a dag displaying MBP layout and associated "
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"block frequencies of the CFG."),
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cl::values(clEnumValN(GVDT_None, "none", "do not display graphs."),
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clEnumValN(GVDT_Fraction, "fraction",
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"display a graph using the "
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"fractional block frequency representation."),
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clEnumValN(GVDT_Integer, "integer",
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"display a graph using the raw "
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"integer fractional block frequency representation."),
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clEnumValN(GVDT_Count, "count",
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"display a graph using the real "
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"profile count if available.")));
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2013-12-03 00:49:33 +00:00
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2017-02-02 21:29:17 +00:00
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// Command line option to specify the name of the function for CFG dump
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// Defined in Analysis/BlockFrequencyInfo.cpp: -view-bfi-func-name=
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2016-06-28 04:07:03 +00:00
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extern cl::opt<std::string> ViewBlockFreqFuncName;
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2017-08-24 21:21:39 +00:00
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2017-02-02 21:29:17 +00:00
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// Command line option to specify hot frequency threshold.
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// Defined in Analysis/BlockFrequencyInfo.cpp: -view-hot-freq-perc=
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2016-06-28 12:34:44 +00:00
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extern cl::opt<unsigned> ViewHotFreqPercent;
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2016-06-22 02:12:54 +00:00
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2017-08-26 00:31:00 +00:00
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static cl::opt<bool> PrintMachineBlockFreq(
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"print-machine-bfi", cl::init(false), cl::Hidden,
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cl::desc("Print the machine block frequency info."));
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// Command line option to specify the name of the function for block frequency
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// dump. Defined in Analysis/BlockFrequencyInfo.cpp.
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extern cl::opt<std::string> PrintBlockFreqFuncName;
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2017-01-29 01:57:02 +00:00
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static GVDAGType getGVDT() {
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if (ViewBlockLayoutWithBFI != GVDT_None)
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return ViewBlockLayoutWithBFI;
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return ViewMachineBlockFreqPropagationDAG;
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}
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2013-12-03 00:49:33 +00:00
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namespace llvm {
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2016-06-21 23:36:12 +00:00
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template <> struct GraphTraits<MachineBlockFrequencyInfo *> {
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2017-08-24 21:21:39 +00:00
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using NodeRef = const MachineBasicBlock *;
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using ChildIteratorType = MachineBasicBlock::const_succ_iterator;
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using nodes_iterator = pointer_iterator<MachineFunction::const_iterator>;
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2013-12-03 00:49:33 +00:00
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2016-08-31 16:48:13 +00:00
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static NodeRef getEntryNode(const MachineBlockFrequencyInfo *G) {
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2015-10-09 19:23:20 +00:00
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return &G->getFunction()->front();
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2013-12-03 00:49:33 +00:00
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}
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2013-12-03 20:21:17 +00:00
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2016-08-22 21:09:30 +00:00
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static ChildIteratorType child_begin(const NodeRef N) {
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2013-12-03 00:49:33 +00:00
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return N->succ_begin();
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}
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2013-12-03 20:21:17 +00:00
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2016-08-22 21:09:30 +00:00
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static ChildIteratorType child_end(const NodeRef N) { return N->succ_end(); }
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2013-12-03 20:21:17 +00:00
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2013-12-03 00:49:33 +00:00
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static nodes_iterator nodes_begin(const MachineBlockFrequencyInfo *G) {
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2016-08-19 21:20:13 +00:00
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return nodes_iterator(G->getFunction()->begin());
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2013-12-03 00:49:33 +00:00
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}
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2013-12-03 20:21:17 +00:00
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2013-12-03 00:49:33 +00:00
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static nodes_iterator nodes_end(const MachineBlockFrequencyInfo *G) {
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2016-08-19 21:20:13 +00:00
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return nodes_iterator(G->getFunction()->end());
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2013-12-03 00:49:33 +00:00
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}
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};
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2017-08-24 21:21:39 +00:00
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using MBFIDOTGraphTraitsBase =
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BFIDOTGraphTraitsBase<MachineBlockFrequencyInfo,
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MachineBranchProbabilityInfo>;
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2016-06-21 23:36:12 +00:00
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template <>
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struct DOTGraphTraits<MachineBlockFrequencyInfo *>
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2016-06-28 03:41:29 +00:00
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: public MBFIDOTGraphTraitsBase {
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2017-08-24 21:21:39 +00:00
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const MachineFunction *CurFunc = nullptr;
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2017-01-29 01:57:02 +00:00
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DenseMap<const MachineBasicBlock *, int> LayoutOrderMap;
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2013-12-03 00:49:33 +00:00
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2017-08-24 21:21:39 +00:00
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explicit DOTGraphTraits(bool isSimple = false)
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: MBFIDOTGraphTraitsBase(isSimple) {}
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2013-12-03 00:49:33 +00:00
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std::string getNodeLabel(const MachineBasicBlock *Node,
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const MachineBlockFrequencyInfo *Graph) {
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2017-01-29 01:57:02 +00:00
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int layout_order = -1;
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// Attach additional ordering information if 'isSimple' is false.
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if (!isSimple()) {
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const MachineFunction *F = Node->getParent();
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if (!CurFunc || F != CurFunc) {
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if (CurFunc)
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LayoutOrderMap.clear();
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CurFunc = F;
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int O = 0;
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for (auto MBI = F->begin(); MBI != F->end(); ++MBI, ++O) {
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LayoutOrderMap[&*MBI] = O;
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}
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}
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layout_order = LayoutOrderMap[Node];
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}
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return MBFIDOTGraphTraitsBase::getNodeLabel(Node, Graph, getGVDT(),
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layout_order);
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2013-12-03 00:49:33 +00:00
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}
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2016-06-28 03:41:29 +00:00
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2016-06-28 06:58:21 +00:00
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std::string getNodeAttributes(const MachineBasicBlock *Node,
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const MachineBlockFrequencyInfo *Graph) {
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return MBFIDOTGraphTraitsBase::getNodeAttributes(Node, Graph,
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ViewHotFreqPercent);
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}
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2016-06-28 03:41:29 +00:00
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std::string getEdgeAttributes(const MachineBasicBlock *Node, EdgeIter EI,
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const MachineBlockFrequencyInfo *MBFI) {
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2016-06-28 06:58:21 +00:00
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return MBFIDOTGraphTraitsBase::getEdgeAttributes(
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Node, EI, MBFI, MBFI->getMBPI(), ViewHotFreqPercent);
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2016-06-22 16:04:51 +00:00
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}
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2013-12-03 00:49:33 +00:00
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};
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} // end namespace llvm
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2017-05-25 21:26:32 +00:00
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INITIALIZE_PASS_BEGIN(MachineBlockFrequencyInfo, DEBUG_TYPE,
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2011-07-16 20:23:20 +00:00
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"Machine Block Frequency Analysis", true, true)
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INITIALIZE_PASS_DEPENDENCY(MachineBranchProbabilityInfo)
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2014-04-21 17:57:07 +00:00
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INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
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2017-05-25 21:26:32 +00:00
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INITIALIZE_PASS_END(MachineBlockFrequencyInfo, DEBUG_TYPE,
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2011-07-16 20:23:20 +00:00
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"Machine Block Frequency Analysis", true, true)
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2011-07-25 19:25:40 +00:00
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char MachineBlockFrequencyInfo::ID = 0;
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2011-07-16 20:23:20 +00:00
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2016-06-21 23:36:12 +00:00
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MachineBlockFrequencyInfo::MachineBlockFrequencyInfo()
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: MachineFunctionPass(ID) {
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2011-07-25 19:25:40 +00:00
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initializeMachineBlockFrequencyInfoPass(*PassRegistry::getPassRegistry());
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2011-07-16 20:23:20 +00:00
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}
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2017-08-24 21:21:39 +00:00
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MachineBlockFrequencyInfo::~MachineBlockFrequencyInfo() = default;
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2011-07-16 20:23:20 +00:00
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2011-07-25 19:25:40 +00:00
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void MachineBlockFrequencyInfo::getAnalysisUsage(AnalysisUsage &AU) const {
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2011-07-16 20:23:20 +00:00
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AU.addRequired<MachineBranchProbabilityInfo>();
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2014-04-21 17:57:07 +00:00
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AU.addRequired<MachineLoopInfo>();
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2011-07-16 20:23:20 +00:00
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AU.setPreservesAll();
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2011-07-21 22:59:09 +00:00
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MachineFunctionPass::getAnalysisUsage(AU);
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2011-07-16 20:23:20 +00:00
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}
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2017-02-14 17:21:09 +00:00
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void MachineBlockFrequencyInfo::calculate(
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const MachineFunction &F, const MachineBranchProbabilityInfo &MBPI,
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const MachineLoopInfo &MLI) {
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2014-03-25 18:01:38 +00:00
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if (!MBFI)
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MBFI.reset(new ImplType);
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2015-07-15 19:58:26 +00:00
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MBFI->calculate(F, MBPI, MLI);
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2016-06-22 02:12:54 +00:00
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if (ViewMachineBlockFreqPropagationDAG != GVDT_None &&
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2016-06-28 04:07:03 +00:00
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(ViewBlockFreqFuncName.empty() ||
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F.getName().equals(ViewBlockFreqFuncName))) {
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2017-02-15 19:21:04 +00:00
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view("MachineBlockFrequencyDAGS." + F.getName());
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2013-12-03 00:49:33 +00:00
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}
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2017-08-26 00:31:00 +00:00
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if (PrintMachineBlockFreq &&
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(PrintBlockFreqFuncName.empty() ||
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F.getName().equals(PrintBlockFreqFuncName))) {
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MBFI->print(dbgs());
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}
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2017-02-14 17:21:09 +00:00
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}
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bool MachineBlockFrequencyInfo::runOnMachineFunction(MachineFunction &F) {
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MachineBranchProbabilityInfo &MBPI =
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getAnalysis<MachineBranchProbabilityInfo>();
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MachineLoopInfo &MLI = getAnalysis<MachineLoopInfo>();
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calculate(F, MBPI, MLI);
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2011-07-16 20:23:20 +00:00
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return false;
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}
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2014-03-25 18:01:38 +00:00
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void MachineBlockFrequencyInfo::releaseMemory() { MBFI.reset(); }
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2013-12-03 00:49:33 +00:00
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/// Pop up a ghostview window with the current block frequency propagation
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/// rendered using dot.
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2017-02-15 19:21:04 +00:00
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void MachineBlockFrequencyInfo::view(const Twine &Name, bool isSimple) const {
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// This code is only for debugging.
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ViewGraph(const_cast<MachineBlockFrequencyInfo *>(this), Name, isSimple);
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2013-12-03 00:49:33 +00:00
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}
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2016-06-21 23:36:12 +00:00
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BlockFrequency
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MachineBlockFrequencyInfo::getBlockFreq(const MachineBasicBlock *MBB) const {
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2014-03-25 18:01:38 +00:00
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return MBFI ? MBFI->getBlockFreq(MBB) : 0;
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2011-07-16 20:23:20 +00:00
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}
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2013-12-03 00:49:33 +00:00
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2016-06-22 19:26:44 +00:00
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Optional<uint64_t> MachineBlockFrequencyInfo::getBlockProfileCount(
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const MachineBasicBlock *MBB) const {
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const Function *F = MBFI->getFunction()->getFunction();
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return MBFI ? MBFI->getBlockProfileCount(*F, MBB) : None;
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}
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2016-08-02 02:15:45 +00:00
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Optional<uint64_t>
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MachineBlockFrequencyInfo::getProfileCountFromFreq(uint64_t Freq) const {
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const Function *F = MBFI->getFunction()->getFunction();
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return MBFI ? MBFI->getProfileCountFromFreq(*F, Freq) : None;
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}
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2014-03-25 18:01:32 +00:00
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const MachineFunction *MachineBlockFrequencyInfo::getFunction() const {
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2014-04-21 17:57:07 +00:00
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return MBFI ? MBFI->getFunction() : nullptr;
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2013-12-03 00:49:33 +00:00
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}
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2013-12-14 00:06:03 +00:00
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2016-06-28 00:15:45 +00:00
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const MachineBranchProbabilityInfo *MachineBlockFrequencyInfo::getMBPI() const {
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return MBFI ? &MBFI->getBPI() : nullptr;
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}
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2013-12-14 00:06:03 +00:00
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raw_ostream &
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MachineBlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
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const BlockFrequency Freq) const {
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2014-03-25 18:01:38 +00:00
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return MBFI ? MBFI->printBlockFreq(OS, Freq) : OS;
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2013-12-14 00:06:03 +00:00
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}
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raw_ostream &
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MachineBlockFrequencyInfo::printBlockFreq(raw_ostream &OS,
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const MachineBasicBlock *MBB) const {
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2014-03-25 18:01:38 +00:00
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return MBFI ? MBFI->printBlockFreq(OS, MBB) : OS;
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2013-12-14 00:06:03 +00:00
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}
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2013-12-14 02:37:38 +00:00
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uint64_t MachineBlockFrequencyInfo::getEntryFreq() const {
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2014-03-25 18:01:38 +00:00
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return MBFI ? MBFI->getEntryFreq() : 0;
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2013-12-14 00:06:03 +00:00
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}
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