llvm-6502/lib/CodeGen/PBQP/Math.h
Lang Hames 030c4bfbc9 New PBQP solver.
* Fixed a reduction bug which occasionally led to infinite-cost (invalid)
  register allocation solutions despite the existence finite-cost solutions.
* Significantly reduced memory usage (>50% reduction).
* Simplified a lot of the solver code.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@94514 91177308-0d34-0410-b5e6-96231b3b80d8
2010-01-26 04:49:58 +00:00

289 lines
8.2 KiB
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//===------ Math.h - PBQP Vector and Matrix classes -------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_PBQP_MATH_H
#define LLVM_CODEGEN_PBQP_MATH_H
#include <cassert>
#include <algorithm>
#include <functional>
namespace PBQP {
typedef float PBQPNum;
/// \brief PBQP Vector class.
class Vector {
public:
/// \brief Construct a PBQP vector of the given size.
explicit Vector(unsigned length) :
length(length), data(new PBQPNum[length]) {
}
/// \brief Construct a PBQP vector with initializer.
Vector(unsigned length, PBQPNum initVal) :
length(length), data(new PBQPNum[length]) {
std::fill(data, data + length, initVal);
}
/// \brief Copy construct a PBQP vector.
Vector(const Vector &v) :
length(v.length), data(new PBQPNum[length]) {
std::copy(v.data, v.data + length, data);
}
/// \brief Destroy this vector, return its memory.
~Vector() { delete[] data; }
/// \brief Assignment operator.
Vector& operator=(const Vector &v) {
delete[] data;
length = v.length;
data = new PBQPNum[length];
std::copy(v.data, v.data + length, data);
return *this;
}
/// \brief Return the length of the vector
unsigned getLength() const {
return length;
}
/// \brief Element access.
PBQPNum& operator[](unsigned index) {
assert(index < length && "Vector element access out of bounds.");
return data[index];
}
/// \brief Const element access.
const PBQPNum& operator[](unsigned index) const {
assert(index < length && "Vector element access out of bounds.");
return data[index];
}
/// \brief Add another vector to this one.
Vector& operator+=(const Vector &v) {
assert(length == v.length && "Vector length mismatch.");
std::transform(data, data + length, v.data, data, std::plus<PBQPNum>());
return *this;
}
/// \brief Subtract another vector from this one.
Vector& operator-=(const Vector &v) {
assert(length == v.length && "Vector length mismatch.");
std::transform(data, data + length, v.data, data, std::minus<PBQPNum>());
return *this;
}
/// \brief Returns the index of the minimum value in this vector
unsigned minIndex() const {
return std::min_element(data, data + length) - data;
}
private:
unsigned length;
PBQPNum *data;
};
/// \brief Output a textual representation of the given vector on the given
/// output stream.
template <typename OStream>
OStream& operator<<(OStream &os, const Vector &v) {
assert((v.getLength() != 0) && "Zero-length vector badness.");
os << "[ " << v[0];
for (unsigned i = 1; i < v.getLength(); ++i) {
os << ", " << v[i];
}
os << " ]";
return os;
}
/// \brief PBQP Matrix class
class Matrix {
public:
/// \brief Construct a PBQP Matrix with the given dimensions.
Matrix(unsigned rows, unsigned cols) :
rows(rows), cols(cols), data(new PBQPNum[rows * cols]) {
}
/// \brief Construct a PBQP Matrix with the given dimensions and initial
/// value.
Matrix(unsigned rows, unsigned cols, PBQPNum initVal) :
rows(rows), cols(cols), data(new PBQPNum[rows * cols]) {
std::fill(data, data + (rows * cols), initVal);
}
/// \brief Copy construct a PBQP matrix.
Matrix(const Matrix &m) :
rows(m.rows), cols(m.cols), data(new PBQPNum[rows * cols]) {
std::copy(m.data, m.data + (rows * cols), data);
}
/// \brief Destroy this matrix, return its memory.
~Matrix() { delete[] data; }
/// \brief Assignment operator.
Matrix& operator=(const Matrix &m) {
delete[] data;
rows = m.rows; cols = m.cols;
data = new PBQPNum[rows * cols];
std::copy(m.data, m.data + (rows * cols), data);
return *this;
}
/// \brief Return the number of rows in this matrix.
unsigned getRows() const { return rows; }
/// \brief Return the number of cols in this matrix.
unsigned getCols() const { return cols; }
/// \brief Matrix element access.
PBQPNum* operator[](unsigned r) {
assert(r < rows && "Row out of bounds.");
return data + (r * cols);
}
/// \brief Matrix element access.
const PBQPNum* operator[](unsigned r) const {
assert(r < rows && "Row out of bounds.");
return data + (r * cols);
}
/// \brief Returns the given row as a vector.
Vector getRowAsVector(unsigned r) const {
Vector v(cols);
for (unsigned c = 0; c < cols; ++c)
v[c] = (*this)[r][c];
return v;
}
/// \brief Returns the given column as a vector.
Vector getColAsVector(unsigned c) const {
Vector v(rows);
for (unsigned r = 0; r < rows; ++r)
v[r] = (*this)[r][c];
return v;
}
/// \brief Reset the matrix to the given value.
Matrix& reset(PBQPNum val = 0) {
std::fill(data, data + (rows * cols), val);
return *this;
}
/// \brief Set a single row of this matrix to the given value.
Matrix& setRow(unsigned r, PBQPNum val) {
assert(r < rows && "Row out of bounds.");
std::fill(data + (r * cols), data + ((r + 1) * cols), val);
return *this;
}
/// \brief Set a single column of this matrix to the given value.
Matrix& setCol(unsigned c, PBQPNum val) {
assert(c < cols && "Column out of bounds.");
for (unsigned r = 0; r < rows; ++r)
(*this)[r][c] = val;
return *this;
}
/// \brief Matrix transpose.
Matrix transpose() const {
Matrix m(cols, rows);
for (unsigned r = 0; r < rows; ++r)
for (unsigned c = 0; c < cols; ++c)
m[c][r] = (*this)[r][c];
return m;
}
/// \brief Returns the diagonal of the matrix as a vector.
///
/// Matrix must be square.
Vector diagonalize() const {
assert(rows == cols && "Attempt to diagonalize non-square matrix.");
Vector v(rows);
for (unsigned r = 0; r < rows; ++r)
v[r] = (*this)[r][r];
return v;
}
/// \brief Add the given matrix to this one.
Matrix& operator+=(const Matrix &m) {
assert(rows == m.rows && cols == m.cols &&
"Matrix dimensions mismatch.");
std::transform(data, data + (rows * cols), m.data, data,
std::plus<PBQPNum>());
return *this;
}
/// \brief Returns the minimum of the given row
PBQPNum getRowMin(unsigned r) const {
assert(r < rows && "Row out of bounds");
return *std::min_element(data + (r * cols), data + ((r + 1) * cols));
}
/// \brief Returns the minimum of the given column
PBQPNum getColMin(unsigned c) const {
PBQPNum minElem = (*this)[0][c];
for (unsigned r = 1; r < rows; ++r)
if ((*this)[r][c] < minElem) minElem = (*this)[r][c];
return minElem;
}
/// \brief Subtracts the given scalar from the elements of the given row.
Matrix& subFromRow(unsigned r, PBQPNum val) {
assert(r < rows && "Row out of bounds");
std::transform(data + (r * cols), data + ((r + 1) * cols),
data + (r * cols),
std::bind2nd(std::minus<PBQPNum>(), val));
return *this;
}
/// \brief Subtracts the given scalar from the elements of the given column.
Matrix& subFromCol(unsigned c, PBQPNum val) {
for (unsigned r = 0; r < rows; ++r)
(*this)[r][c] -= val;
return *this;
}
/// \brief Returns true if this is a zero matrix.
bool isZero() const {
return find_if(data, data + (rows * cols),
std::bind2nd(std::not_equal_to<PBQPNum>(), 0)) ==
data + (rows * cols);
}
private:
unsigned rows, cols;
PBQPNum *data;
};
/// \brief Output a textual representation of the given matrix on the given
/// output stream.
template <typename OStream>
OStream& operator<<(OStream &os, const Matrix &m) {
assert((m.getRows() != 0) && "Zero-row matrix badness.");
for (unsigned i = 0; i < m.getRows(); ++i) {
os << m.getRowAsVector(i);
}
return os;
}
}
#endif // LLVM_CODEGEN_PBQP_MATH_H