the various ConstantExpr::get*Ty methods existed to work with issues around
[llvm/stm8.git] / lib / CodeGen / MachineLoopRanges.cpp
blob17fe67f65045d0aea226ec6344ae9e5975112ae4
1 //===- MachineLoopRanges.cpp - Ranges of machine loops --------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file provides the implementation of the MachineLoopRanges analysis.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/CodeGen/MachineLoopRanges.h"
15 #include "llvm/CodeGen/MachineLoopInfo.h"
16 #include "llvm/CodeGen/Passes.h"
18 using namespace llvm;
20 char MachineLoopRanges::ID = 0;
21 INITIALIZE_PASS_BEGIN(MachineLoopRanges, "machine-loop-ranges",
22 "Machine Loop Ranges", true, true)
23 INITIALIZE_PASS_DEPENDENCY(SlotIndexes)
24 INITIALIZE_PASS_DEPENDENCY(MachineLoopInfo)
25 INITIALIZE_PASS_END(MachineLoopRanges, "machine-loop-ranges",
26 "Machine Loop Ranges", true, true)
28 char &llvm::MachineLoopRangesID = MachineLoopRanges::ID;
30 void MachineLoopRanges::getAnalysisUsage(AnalysisUsage &AU) const {
31 AU.setPreservesAll();
32 AU.addRequiredTransitive<SlotIndexes>();
33 AU.addRequiredTransitive<MachineLoopInfo>();
34 MachineFunctionPass::getAnalysisUsage(AU);
37 /// runOnMachineFunction - Don't do much, loop ranges are computed on demand.
38 bool MachineLoopRanges::runOnMachineFunction(MachineFunction &) {
39 releaseMemory();
40 Indexes = &getAnalysis<SlotIndexes>();
41 return false;
44 void MachineLoopRanges::releaseMemory() {
45 DeleteContainerSeconds(Cache);
46 Cache.clear();
49 MachineLoopRange *MachineLoopRanges::getLoopRange(const MachineLoop *Loop) {
50 MachineLoopRange *&Range = Cache[Loop];
51 if (!Range)
52 Range = new MachineLoopRange(Loop, Allocator, *Indexes);
53 return Range;
56 /// Create a MachineLoopRange, only accessible to MachineLoopRanges.
57 MachineLoopRange::MachineLoopRange(const MachineLoop *loop,
58 MachineLoopRange::Allocator &alloc,
59 SlotIndexes &Indexes)
60 : Loop(loop), Intervals(alloc), Area(0) {
61 // Compute loop coverage.
62 for (MachineLoop::block_iterator I = Loop->block_begin(),
63 E = Loop->block_end(); I != E; ++I) {
64 const std::pair<SlotIndex, SlotIndex> &Range = Indexes.getMBBRange(*I);
65 Intervals.insert(Range.first, Range.second, 1u);
66 Area += Range.first.distance(Range.second);
70 /// overlaps - Return true if this loop overlaps the given range of machine
71 /// instructions.
72 bool MachineLoopRange::overlaps(SlotIndex Start, SlotIndex Stop) {
73 Map::const_iterator I = Intervals.find(Start);
74 return I.valid() && Stop > I.start();
77 unsigned MachineLoopRange::getNumber() const {
78 return Loop->getHeader()->getNumber();
81 /// byNumber - Comparator for array_pod_sort that sorts a list of
82 /// MachineLoopRange pointers by number.
83 int MachineLoopRange::byNumber(const void *pa, const void *pb) {
84 const MachineLoopRange *a = *static_cast<MachineLoopRange *const *>(pa);
85 const MachineLoopRange *b = *static_cast<MachineLoopRange *const *>(pb);
86 unsigned na = a->getNumber();
87 unsigned nb = b->getNumber();
88 if (na < nb)
89 return -1;
90 if (na > nb)
91 return 1;
92 return 0;
95 /// byAreaDesc - Comparator for array_pod_sort that sorts a list of
96 /// MachineLoopRange pointers by:
97 /// 1. Descending area.
98 /// 2. Ascending number.
99 int MachineLoopRange::byAreaDesc(const void *pa, const void *pb) {
100 const MachineLoopRange *a = *static_cast<MachineLoopRange *const *>(pa);
101 const MachineLoopRange *b = *static_cast<MachineLoopRange *const *>(pb);
102 if (a->getArea() != b->getArea())
103 return a->getArea() > b->getArea() ? -1 : 1;
104 return byNumber(pa, pb);
107 void MachineLoopRange::print(raw_ostream &OS) const {
108 OS << "Loop#" << getNumber() << " =";
109 for (Map::const_iterator I = Intervals.begin(); I.valid(); ++I)
110 OS << " [" << I.start() << ';' << I.stop() << ')';
113 raw_ostream &llvm::operator<<(raw_ostream &OS, const MachineLoopRange &MLR) {
114 MLR.print(OS);
115 return OS;