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//===- PresburgerSpace.cpp - MLIR PresburgerSpace Class -------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "mlir/Analysis/Presburger/PresburgerSpace.h"
#include <algorithm>
#include <cassert>
using namespace mlir;
using namespace presburger;
PresburgerSpace PresburgerSpace::getDomainSpace() const {
// TODO: Preserve identifiers here.
return PresburgerSpace::getSetSpace(numDomain, numSymbols, numLocals);
}
PresburgerSpace PresburgerSpace::getRangeSpace() const {
return PresburgerSpace::getSetSpace(numRange, numSymbols, numLocals);
}
PresburgerSpace PresburgerSpace::getSpaceWithoutLocals() const {
PresburgerSpace space = *this;
space.removeVarRange(VarKind::Local, 0, numLocals);
return space;
}
unsigned PresburgerSpace::getNumVarKind(VarKind kind) const {
if (kind == VarKind::Domain)
return getNumDomainVars();
if (kind == VarKind::Range)
return getNumRangeVars();
if (kind == VarKind::Symbol)
return getNumSymbolVars();
if (kind == VarKind::Local)
return numLocals;
llvm_unreachable("VarKind does not exist!");
}
unsigned PresburgerSpace::getVarKindOffset(VarKind kind) const {
if (kind == VarKind::Domain)
return 0;
if (kind == VarKind::Range)
return getNumDomainVars();
if (kind == VarKind::Symbol)
return getNumDimVars();
if (kind == VarKind::Local)
return getNumDimAndSymbolVars();
llvm_unreachable("VarKind does not exist!");
}
unsigned PresburgerSpace::getVarKindEnd(VarKind kind) const {
return getVarKindOffset(kind) + getNumVarKind(kind);
}
unsigned PresburgerSpace::getVarKindOverlap(VarKind kind, unsigned varStart,
unsigned varLimit) const {
unsigned varRangeStart = getVarKindOffset(kind);
unsigned varRangeEnd = getVarKindEnd(kind);
// Compute number of elements in intersection of the ranges [varStart,
// varLimit) and [varRangeStart, varRangeEnd).
unsigned overlapStart = std::max(varStart, varRangeStart);
unsigned overlapEnd = std::min(varLimit, varRangeEnd);
if (overlapStart > overlapEnd)
return 0;
return overlapEnd - overlapStart;
}
VarKind PresburgerSpace::getVarKindAt(unsigned pos) const {
assert(pos < getNumVars() && "`pos` should represent a valid var position");
if (pos < getVarKindEnd(VarKind::Domain))
return VarKind::Domain;
if (pos < getVarKindEnd(VarKind::Range))
return VarKind::Range;
if (pos < getVarKindEnd(VarKind::Symbol))
return VarKind::Symbol;
if (pos < getVarKindEnd(VarKind::Local))
return VarKind::Local;
llvm_unreachable("`pos` should represent a valid var position");
}
unsigned PresburgerSpace::insertVar(VarKind kind, unsigned pos, unsigned num) {
assert(pos <= getNumVarKind(kind));
unsigned absolutePos = getVarKindOffset(kind) + pos;
if (kind == VarKind::Domain)
numDomain += num;
else if (kind == VarKind::Range)
numRange += num;
else if (kind == VarKind::Symbol)
numSymbols += num;
else
numLocals += num;
// Insert NULL identifiers if `usingIds` and variables inserted are
// not locals.
if (usingIds && kind != VarKind::Local)
identifiers.insert(identifiers.begin() + absolutePos, num, nullptr);
return absolutePos;
}
void PresburgerSpace::removeVarRange(VarKind kind, unsigned varStart,
unsigned varLimit) {
assert(varLimit <= getNumVarKind(kind) && "invalid var limit");
if (varStart >= varLimit)
return;
unsigned numVarsEliminated = varLimit - varStart;
if (kind == VarKind::Domain)
numDomain -= numVarsEliminated;
else if (kind == VarKind::Range)
numRange -= numVarsEliminated;
else if (kind == VarKind::Symbol)
numSymbols -= numVarsEliminated;
else
numLocals -= numVarsEliminated;
// Remove identifiers if `usingIds` and variables removed are not
// locals.
if (usingIds && kind != VarKind::Local)
identifiers.erase(identifiers.begin() + getVarKindOffset(kind) + varStart,
identifiers.begin() + getVarKindOffset(kind) + varLimit);
}
void PresburgerSpace::swapVar(VarKind kindA, VarKind kindB, unsigned posA,
unsigned posB) {
if (!usingIds)
return;
if (kindA == VarKind::Local && kindB == VarKind::Local)
return;
if (kindA == VarKind::Local) {
atId(kindB, posB) = nullptr;
return;
}
if (kindB == VarKind::Local) {
atId(kindA, posA) = nullptr;
return;
}
std::swap(atId(kindA, posA), atId(kindB, posB));
}
bool PresburgerSpace::isCompatible(const PresburgerSpace &other) const {
return getNumDomainVars() == other.getNumDomainVars() &&
getNumRangeVars() == other.getNumRangeVars() &&
getNumSymbolVars() == other.getNumSymbolVars();
}
bool PresburgerSpace::isEqual(const PresburgerSpace &other) const {
return isCompatible(other) && getNumLocalVars() == other.getNumLocalVars();
}
bool PresburgerSpace::isAligned(const PresburgerSpace &other) const {
assert(isUsingIds() && other.isUsingIds() &&
"Both spaces should be using identifiers to check for "
"alignment.");
return isCompatible(other) && identifiers == other.identifiers;
}
bool PresburgerSpace::isAligned(const PresburgerSpace &other,
VarKind kind) const {
assert(isUsingIds() && other.isUsingIds() &&
"Both spaces should be using identifiers to check for "
"alignment.");
ArrayRef<void *> kindAttachments =
ArrayRef(identifiers).slice(getVarKindOffset(kind), getNumVarKind(kind));
ArrayRef<void *> otherKindAttachments =
ArrayRef(other.identifiers)
.slice(other.getVarKindOffset(kind), other.getNumVarKind(kind));
return kindAttachments == otherKindAttachments;
}
void PresburgerSpace::setVarSymbolSeperation(unsigned newSymbolCount) {
assert(newSymbolCount <= getNumDimAndSymbolVars() &&
"invalid separation position");
numRange = numRange + numSymbols - newSymbolCount;
numSymbols = newSymbolCount;
// We do not need to change `identifiers` since the ordering of
// `identifiers` remains same.
}
void PresburgerSpace::print(llvm::raw_ostream &os) const {
os << "Domain: " << getNumDomainVars() << ", "
<< "Range: " << getNumRangeVars() << ", "
<< "Symbols: " << getNumSymbolVars() << ", "
<< "Locals: " << getNumLocalVars() << "\n";
if (usingIds) {
#ifdef LLVM_ENABLE_ABI_BREAKING_CHECKS
os << "TypeID of identifiers: " << idType.getAsOpaquePointer() << "\n";
#endif
os << "(";
for (void *identifier : identifiers)
os << identifier << " ";
os << ")\n";
}
}
void PresburgerSpace::dump() const { print(llvm::errs()); }
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