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https://github.com/c64scene-ar/llvm-6502.git
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78e5c1140a
except it doesn't care if the definitions' virtual registers differ. This is used by machine LICM and other MI passes to perform CSE. - Teach Thumb2InstrInfo::isIdentical() to check two t2LDRpci_pic are identical. Since pc relative constantpool entries are always different, this requires it it check if the values can actually the same. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86328 91177308-0d34-0410-b5e6-96231b3b80d8
122 lines
4.1 KiB
C++
122 lines
4.1 KiB
C++
//===- ARMConstantPoolValue.cpp - ARM constantpool value --------*- C++ -*-===//
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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 implements the ARM specific constantpool value class.
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//
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//===----------------------------------------------------------------------===//
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#include "ARMConstantPoolValue.h"
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#include "llvm/ADT/FoldingSet.h"
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#include "llvm/Constant.h"
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#include "llvm/Constants.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/Type.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cstdlib>
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using namespace llvm;
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ARMConstantPoolValue::ARMConstantPoolValue(Constant *cval, unsigned id,
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ARMCP::ARMCPKind K,
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unsigned char PCAdj,
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const char *Modif,
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bool AddCA)
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: MachineConstantPoolValue((const Type*)cval->getType()),
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CVal(cval), S(NULL), LabelId(id), Kind(K), PCAdjust(PCAdj),
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Modifier(Modif), AddCurrentAddress(AddCA) {}
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ARMConstantPoolValue::ARMConstantPoolValue(LLVMContext &C,
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const char *s, unsigned id,
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unsigned char PCAdj,
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const char *Modif,
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bool AddCA)
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: MachineConstantPoolValue((const Type*)Type::getInt32Ty(C)),
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CVal(NULL), S(strdup(s)), LabelId(id), Kind(ARMCP::CPExtSymbol),
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PCAdjust(PCAdj), Modifier(Modif), AddCurrentAddress(AddCA) {}
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ARMConstantPoolValue::ARMConstantPoolValue(GlobalValue *gv, const char *Modif)
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: MachineConstantPoolValue((const Type*)Type::getInt32Ty(gv->getContext())),
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CVal(gv), S(NULL), LabelId(0), Kind(ARMCP::CPValue), PCAdjust(0),
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Modifier(Modif) {}
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GlobalValue *ARMConstantPoolValue::getGV() const {
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return dyn_cast_or_null<GlobalValue>(CVal);
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}
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BlockAddress *ARMConstantPoolValue::getBlockAddress() const {
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return dyn_cast_or_null<BlockAddress>(CVal);
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}
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int ARMConstantPoolValue::getExistingMachineCPValue(MachineConstantPool *CP,
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unsigned Alignment) {
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unsigned AlignMask = Alignment - 1;
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const std::vector<MachineConstantPoolEntry> Constants = CP->getConstants();
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for (unsigned i = 0, e = Constants.size(); i != e; ++i) {
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if (Constants[i].isMachineConstantPoolEntry() &&
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(Constants[i].getAlignment() & AlignMask) == 0) {
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ARMConstantPoolValue *CPV =
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(ARMConstantPoolValue *)Constants[i].Val.MachineCPVal;
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if (CPV->CVal == CVal &&
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CPV->LabelId == LabelId &&
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CPV->PCAdjust == PCAdjust &&
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(CPV->S == S || strcmp(CPV->S, S) == 0) &&
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(CPV->Modifier == Modifier || strcmp(CPV->Modifier, Modifier) == 0))
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return i;
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}
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}
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return -1;
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}
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ARMConstantPoolValue::~ARMConstantPoolValue() {
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free((void*)S);
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}
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void
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ARMConstantPoolValue::AddSelectionDAGCSEId(FoldingSetNodeID &ID) {
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ID.AddPointer(CVal);
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ID.AddPointer(S);
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ID.AddInteger(LabelId);
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ID.AddInteger(PCAdjust);
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}
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bool
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ARMConstantPoolValue::hasSameValue(ARMConstantPoolValue *ACPV) {
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if (ACPV->Kind == Kind &&
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ACPV->CVal == CVal &&
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ACPV->PCAdjust == PCAdjust &&
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(ACPV->S == S || strcmp(ACPV->S, S) == 0) &&
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(ACPV->Modifier == Modifier || strcmp(ACPV->Modifier, Modifier) == 0)) {
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if (ACPV->LabelId == LabelId)
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return true;
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// Two PC relative constpool entries containing the same GV address or
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// external symbols. FIXME: What about blockaddress?
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if (Kind == ARMCP::CPValue || Kind == ARMCP::CPExtSymbol)
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return true;
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}
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return false;
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}
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void ARMConstantPoolValue::dump() const {
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errs() << " " << *this;
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}
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void ARMConstantPoolValue::print(raw_ostream &O) const {
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if (CVal)
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O << CVal->getName();
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else
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O << S;
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if (Modifier) O << "(" << Modifier << ")";
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if (PCAdjust != 0) {
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O << "-(LPC" << LabelId << "+" << (unsigned)PCAdjust;
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if (AddCurrentAddress) O << "-.";
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O << ")";
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}
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}
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