22260349136

Committed 21 Feb 2026 04:37PM UTC coverage: 89.471% (+0.5%) from 89.013%

Build # 22260349136

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Pull #38

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Commit Message

Merge 2add315b1 into e13878911

Pull Request Pull Request #38: [WIP] Speedup

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95.45

/src/core/Matrix.c

/*
 * Copyright 2025 Daniel Cederberg
 *
 * This file is part of the PSLP project (LP Presolver).
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include "Matrix.h"
#include "Debugger.h"
#include "Memory_wrapper.h"
#include "Numerics.h"
#include "PSLP_warnings.h"
#include "RowColViews.h"
#include "glbopts.h"
#include "stdlib.h"
#include "string.h"

Matrix *matrix_new(const double *Ax, const int *Ai, const int *Ap, size_t n_rows,
                   size_t n_cols, size_t nnz)
{
    DEBUG(ASSERT_NO_ZEROS_D(Ax, nnz));
    Matrix *A = matrix_alloc(n_rows, n_cols, nnz);
    RETURN_PTR_IF_NULL(A, NULL);
    size_t i, len;
    int offset, row_size, row_alloc;

    offset = 0;
    for (i = 0; i < n_rows; ++i)
    {
        A->p[i].start = Ap[i] + offset;
        len = (size_t) (Ap[i + 1] - Ap[i]);
        memcpy(A->x + A->p[i].start, Ax + Ap[i], len * sizeof(double));
        memcpy(A->i + A->p[i].start, Ai + Ap[i], len * sizeof(int));
        A->p[i].end = Ap[i + 1] + offset;
        row_size = A->p[i].end - A->p[i].start;
        row_alloc = calc_memory_row(row_size, EXTRA_ROW_SPACE, EXTRA_MEMORY_RATIO);
        offset += row_alloc - row_size;
    }

    A->p[n_rows].start = Ap[n_rows] + offset;
    A->p[n_rows].end = A->p[n_rows].start;

    return A;
}

// needed for the transpose function
Matrix *matrix_alloc(size_t n_rows, size_t n_cols, size_t nnz)
{
    Matrix *A = (Matrix *) ps_malloc(1, sizeof(Matrix));
    RETURN_PTR_IF_NULL(A, NULL);

    A->m = n_rows;
    A->n = n_cols;
    A->nnz = nnz;
    A->n_alloc = calc_memory(nnz, n_rows, EXTRA_ROW_SPACE, EXTRA_MEMORY_RATIO);

#ifdef TESTING
    A->i = (int *) ps_calloc(A->n_alloc, sizeof(int));
    A->p = (RowRange *) ps_calloc(n_rows + 1, sizeof(RowRange));
    A->x = (double *) ps_calloc(A->n_alloc, sizeof(double));
#else
    A->i = (int *) ps_malloc(A->n_alloc, sizeof(int));
    A->p = (RowRange *) ps_malloc(n_rows + 1, sizeof(RowRange));
    A->x = (double *) ps_malloc(A->n_alloc, sizeof(double));
#endif

    if (!A->i || !A->p || !A->x)
    {
        free_matrix(A);
        return NULL;
    }

    return A;
}

Matrix *matrix_new_no_extra_space(const double *Ax, const int *Ai, const int *Ap,
                                  size_t n_rows, size_t n_cols, size_t nnz)
{
    Matrix *A = (Matrix *) ps_malloc(1, sizeof(Matrix));
    RETURN_PTR_IF_NULL(A, NULL);

    A->m = n_rows;
    A->n = n_cols;
    A->nnz = nnz;
    A->n_alloc = nnz;
    A->i = (int *) ps_malloc(A->n_alloc, sizeof(int));
    A->p = (RowRange *) ps_malloc(n_rows + 1, sizeof(RowRange));
    A->x = (double *) ps_malloc(A->n_alloc, sizeof(double));

    if (!A->i || !A->p || !A->x)
    {
        free_matrix(A);
        return NULL;
    }

    memcpy(A->x, Ax, nnz * sizeof(double));
    memcpy(A->i, Ai, nnz * sizeof(int));

    for (int i = 0; i <= n_rows; ++i)
    {
        A->p[i].start = Ap[i];
        A->p[i].end = Ap[i + 1];
    }

    return A;
}

Matrix *transpose(const Matrix *A, int *work_n_cols)
{
    Matrix *AT = matrix_alloc(A->n, A->m, A->nnz);
    RETURN_PTR_IF_NULL(AT, NULL);
    int i, j, start;
    int *count = work_n_cols;
    memset(count, 0, A->n * sizeof(int));

    // -------------------------------------------------------------------
    //  compute nnz in each column of A
    // -------------------------------------------------------------------
    for (i = 0; i < A->m; ++i)
    {
        for (j = A->p[i].start; j < A->p[i].end; ++j)
        {
            count[A->i[j]]++;
        }
    }
    // ------------------------------------------------------------------
    //  compute row pointers, taking the extra space into account
    // ------------------------------------------------------------------
    AT->p[0].start = 0;
    for (i = 0; i < A->n; ++i)
    {
        start = AT->p[i].start;
        AT->p[i].end = start + count[i];
        AT->p[i + 1].start =
            start + calc_memory_row(count[i], EXTRA_ROW_SPACE, EXTRA_MEMORY_RATIO);
        count[i] = start;
    }

    AT->p[A->n].start = (int) AT->n_alloc;
    AT->p[A->n].end = (int) AT->n_alloc;

    // ------------------------------------------------------------------
    //  fill transposed matrix (this is a bottleneck)
    // ------------------------------------------------------------------
    for (i = 0; i < A->m; ++i)
    {
        for (j = A->p[i].start; j < A->p[i].end; j++)
        {
            AT->x[count[A->i[j]]] = A->x[j];
            AT->i[count[A->i[j]]] = i;
            count[A->i[j]]++;
        }
    }

    return AT;
}

size_t calc_memory(size_t nnz, size_t n_rows, size_t extra_row_space,
                   double memory_ratio)
{
    /* disable conversion compiler warning*/
    PSLP_DIAG_PUSH();
    PSLP_DIAG_IGNORE_CONVERSION();

    /* intentional truncation */
    size_t result = (size_t) (nnz * memory_ratio) + n_rows * extra_row_space;

    /* enable conversion compiler warnings */
    PSLP_DIAG_POP();
    return result;
}

int calc_memory_row(int size, int extra_row_space, double memory_ratio)
{
    return (int) (size * memory_ratio) + extra_row_space;
}

void free_matrix(Matrix *A)
{
    if (A)
    {
        PS_FREE(A->i);
        PS_FREE(A->p);
        PS_FREE(A->x);
    }

    PS_FREE(A);
}

void remove_extra_space(Matrix *A, const int *row_sizes, bool remove_all,
                        const int *col_idxs_map, size_t new_n_cols)
{
    int j, start, end, len, row_alloc, curr;
    int extra_row_space = (remove_all) ? 0 : EXTRA_ROW_SPACE;
    double extra_mem_ratio = (remove_all) ? 1.0 : EXTRA_MEMORY_RATIO;
    curr = 0;
    size_t i, n_deleted_rows;

    // --------------------------------------------------------------------------
    // loop through the rows and remove redundant space, including inactive
    // rows.
    // --------------------------------------------------------------------------
    n_deleted_rows = 0;
    for (i = 0; i < A->m; ++i)
    {
        if (row_sizes[i] == SIZE_INACTIVE_ROW)
        {
            n_deleted_rows++;
            continue;
        }

        start = A->p[i].start;
        end = A->p[i].end;
        len = end - start;
        memmove(A->x + curr, A->x + start, (size_t) (len) * sizeof(double));
        memmove(A->i + curr, A->i + start, (size_t) (len) * sizeof(int));
        A->p[i - n_deleted_rows].start = curr;
        A->p[i - n_deleted_rows].end = curr + len;
        row_alloc = calc_memory_row(len, extra_row_space, extra_mem_ratio);
        curr += row_alloc;
    }

    A->m -= n_deleted_rows;
    A->p[A->m].start = curr;
    A->p[A->m].end = curr;

    // shrink size
    A->x = (double *) ps_realloc(A->x, (size_t) MAX(curr, 1), sizeof(double));
    A->i = (int *) ps_realloc(A->i, (size_t) MAX(curr, 1), sizeof(int));
    A->p = (RowRange *) ps_realloc(A->p, (size_t) (A->m + 1), sizeof(RowRange));

    // -------------------------------------------------------------------------
    //                        update column indices
    // -------------------------------------------------------------------------
    A->n = new_n_cols;
    for (i = 0; i < A->m; ++i)
    {
        for (j = A->p[i].start; j < A->p[i].end; ++j)
        {
            A->i[j] = col_idxs_map[A->i[j]];
        }
    }
}

bool shift_row(Matrix *A, int row, int extra_space, int max_shift)
{
    int left, right, missing_space, remaining_shifts, left_shifts;
    int right_shifts, space_left, space_right, n_move_right, n_move_left;
    int next_start, next_end;
    bool shift_left;
    RowRange *row_r = A->p;
    left = row;
    right = row + 1;
    remaining_shifts = max_shift;
    left_shifts = 0;
    right_shifts = 0;
    missing_space = extra_space - (row_r[right].start - row_r[row].end);

    if (missing_space <= 0)
    {
        return true;
    }

    // ------------------------------------------------------------------------
    // compute the new start index for row 'row' and a lower bound on the start
    // index for the the first active row following row 'row'.
    // ------------------------------------------------------------------------
    while (missing_space > 0)
    {
        if (left == 0 && right == A->m)
        {
            return false;
        }

        // space_left is the number of steps we can shift 'left' row to the
        // left without overwriting row 'left - 1'.
        // space_right is the number of steps we can shift 'right' row to
        // the right without overwriting row 'right + 1'.
        assert(left >= 0 && right <= A->m);
        space_left = (left == 0) ? 0 : row_r[left].start - row_r[left - 1].end;
        space_right =
            (right == A->m) ? 0 : row_r[right + 1].start - row_r[right].end;
        assert(space_left >= 0 && space_right >= 0);

        // number of elements that must be moved left resp. right if we shift
        // in a certain direction
        n_move_right = row_r[right].end - row_r[right].start;
        n_move_left = row_r[left].end - row_r[left].start;

        // decide which direction to shift
        if (left == 0)
        {
            if (right != A->m && n_move_right <= remaining_shifts)
            {
                shift_left = false;
            }
            else
            {
                return false;
            }
        }
        else if (right == A->m)
        {
            if (left != 0 && n_move_left <= remaining_shifts)
            {
                shift_left = true;
            }
            else
            {
                return false;
            }
        }
        else if (n_move_left == 0)
        {
            shift_left = true;
        }
        else if (n_move_right == 0)
        {
            shift_left = false;
        }
        else if (n_move_left <= remaining_shifts &&
                 (space_left / (double) (n_move_left) >=
                  space_right / (double) (n_move_right)))
        {
            shift_left = true;
        }
        else if (n_move_right <= remaining_shifts)
        {
            shift_left = false;
        }
        else
        {
            return false;
        }

        assert(!(shift_left && left == 0) && !(!shift_left && right == A->m));

        if (shift_left)
        {
            left_shifts = MIN(missing_space, space_left);
            missing_space -= left_shifts;
            remaining_shifts -= n_move_left;
            left -= 1;
        }
        else
        {
            right_shifts = MIN(missing_space, space_right);
            missing_space -= right_shifts;
            remaining_shifts -= n_move_right;
            right += 1;
        }
    }
    assert(remaining_shifts >= 0);

    // ------------------------------------------------------------------------
    //                 execute total left shift
    // ------------------------------------------------------------------------
    next_start = row_r[left + 1].start - left_shifts;
    for (; left < row; left++)
    {
        int len = row_r[left + 1].end - row_r[left + 1].start;
        if (len > 0)
        {
            memmove(A->x + next_start, A->x + row_r[left + 1].start,
                    ((size_t) len) * sizeof(double));
            memmove(A->i + next_start, A->i + row_r[left + 1].start,
                    ((size_t) len) * sizeof(int));
        }
        row_r[left + 1].start = next_start;
        row_r[left + 1].end = next_start + len;
        next_start += len;
    }

    // ------------------------------------------------------------------------
    //                 execute total right shift
    // ------------------------------------------------------------------------
    next_end = row_r[right - 1].end + right_shifts;
    for (; right > row + 1; right--)
    {
        int len = row_r[right - 1].end - row_r[right - 1].start;
        if (len > 0)
        {
            memmove(A->x + next_end - len, A->x + row_r[right - 1].start,
                    ((size_t) len) * sizeof(double));
            memmove(A->i + next_end - len, A->i + row_r[right - 1].start,
                    ((size_t) len) * sizeof(int));
        }
        row_r[right - 1].start = next_end - len;
        row_r[right - 1].end = next_end;
        next_end = row_r[right - 1].start;
    }

    assert(row_r[row + 1].start - row_r[row].end == extra_space);
    return true;
}

void print_row_starts(const RowRange *row_ranges, size_t len)
{
    for (size_t i = 0; i < len; ++i)
    {
        printf("%d ", row_ranges[i].start);
    }
    printf("\n");
}

double insert_or_update_coeff(Matrix *A, int row, int col, double val, int *row_size)
{
    int i, start, end, insertion;
    double old_val = 0.0;
    start = A->p[row].start;
    end = A->p[row].end;
    insertion = end;

    // -----------------------------------------------------------------
    //             find where it should be inserted
    // -----------------------------------------------------------------
    for (i = start; i < end; ++i)
    {
        if (A->i[i] >= col)
        {
            insertion = i;
            break;
        }
    }

    // -----------------------------------------------------------------
    // Insert the new value if it is nonzero. If it exists or should be
    // inserted in the end, we don't need to shift values.
    // -----------------------------------------------------------------
    if (ABS(val) > ZERO_TOL)
    {
        // assert(!IS_ZERO_FEAS_TOL(val));
        if (insertion == end)
        {
            A->x[insertion] = val;
            A->i[insertion] = col;
            A->p[row].end += 1;
            A->nnz += 1;
            *row_size += 1;
        }
        else if (A->i[insertion] == col)
        {
            old_val = A->x[insertion];
            A->x[insertion] = val;
        }
        else
        {
            size_t len = (size_t) (end - insertion);
            memmove(A->x + insertion + 1, A->x + insertion, len * sizeof(double));
            memmove(A->i + insertion + 1, A->i + insertion, len * sizeof(int));

            // insert new value
            A->x[insertion] = val;
            A->i[insertion] = col;
            A->p[row].end += 1;
            A->nnz += 1;
            *row_size += 1;
        }
    }
    // if the new value is zero, we just have to shift
    else
    {
        // we only expect that the new value is zero if the coefficient
        // already exists
        assert(A->i[insertion] == col);

        // we only have to shift values if the zero is not in the end
        if (insertion != end - 1)
        {
            size_t len = (size_t) (end - insertion - 1);
            memmove(A->x + insertion, A->x + insertion + 1, len * sizeof(double));
            memmove(A->i + insertion, A->i + insertion + 1, len * sizeof(int));
        }

        A->p[row].end -= 1;
        A->nnz -= 1;
        *row_size -= 1;
    }

    assert(A->p[row].end <= A->p[row + 1].start);
    return old_val;
}

void remove_coeff(RowView *row, int col)
{
    int shift = 0;
    int len = *row->len;
    for (int i = 0; i < len; ++i)
    {
        if (row->cols[i] == col)
        {
            shift = 1;
        }

        row->vals[i] = row->vals[i + shift];
        row->cols[i] = row->cols[i + shift];
    }

    assert(shift != 0);
    (*row->range).end -= 1;
    *row->len -= 1;
}

void count_rows(const Matrix *A, int *row_sizes)
{
    for (int i = 0; i < A->m; ++i)
    {
        row_sizes[i] = A->p[i].end - A->p[i].start;
    }
}

#ifdef TESTING
// Function to create a random CSR matrix
Matrix *random_matrix_new(size_t n_rows, size_t n_cols, double density)
{
    // allocate memory

    /* disable conversion compiler warning*/
    PSLP_DIAG_PUSH();
    PSLP_DIAG_IGNORE_CONVERSION();
    /* intentional truncation */
    size_t n_alloc_nnz = (size_t) (density * n_rows * n_cols);

    /* enable conversion compiler warnings */
    PSLP_DIAG_POP();
    double *Ax = (double *) ps_malloc(n_alloc_nnz, sizeof(double));
    int *Ai = (int *) ps_malloc(n_alloc_nnz, sizeof(int));
    int *Ap = (int *) ps_malloc(n_rows + 1, sizeof(int));
    if (!Ax || !Ai || !Ap)
    {
        PS_FREE(Ax);
        PS_FREE(Ai);
        PS_FREE(Ap);
        return NULL;
    }

    // Initialize random number generator
    srand(1);

    size_t nnz_count = 0; // Counter for nonzero elements
    Ap[0] = 0;

    for (size_t i = 0; i < n_rows; ++i)
    {
        size_t row_nnz = 0;

        // Randomly determine the number of nonzeros in this row
        for (size_t j = 0; j < n_cols; ++j)
        {
            if ((double) rand() / RAND_MAX < density)
            {
                if (nnz_count >= n_alloc_nnz)
                {
                    break;
                }

                Ax[nnz_count] = ((double) (rand() - rand()) / RAND_MAX) * 20.0;
                Ai[nnz_count] = (int) j;
                ++nnz_count;
                ++row_nnz;
            }
        }
        Ap[i + 1] = Ap[i] + (int) row_nnz;
    }

    // create matrix in modified CSR format
    Matrix *A = matrix_new(Ax, Ai, Ap, n_rows, n_cols, nnz_count);
    PS_FREE(Ax);
    PS_FREE(Ai);
    PS_FREE(Ap);

    return A;
}

void replace_row_A(Matrix *A, int row, double ratio, double *new_vals, int *cols_new,
                   int new_len)
{
    int i, len, start, n_new_elements;
    len = A->p[row].end - A->p[row].start;
    n_new_elements = new_len - len;

    // potentially shift row to get extra space
    if (n_new_elements > 0)
    {
        assert(shift_row(A, row, n_new_elements, 2000));
    }

    // replace the row
    start = A->p[row].start;
    for (i = 0; i < new_len; ++i)
    {
        A->x[start + i] = ratio * new_vals[i];
        A->i[start + i] = cols_new[i];
    }
    A->p[row].end = A->p[row].start + new_len;
    assert(A->p[row].end <= A->p[row + 1].start);
}

#endif

1	/*
2	* Copyright 2025 Daniel Cederberg
3	*
4	* This file is part of the PSLP project (LP Presolver).
5	*
6	* Licensed under the Apache License, Version 2.0 (the "License");
7	* you may not use this file except in compliance with the License.
8	* You may obtain a copy of the License at
9	*
10	* http://www.apache.org/licenses/LICENSE-2.0
11	*
12	* Unless required by applicable law or agreed to in writing, software
13	* distributed under the License is distributed on an "AS IS" BASIS,
14	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15	* See the License for the specific language governing permissions and
16	* limitations under the License.
17	*/
18
19	#include "Matrix.h"
20	#include "Debugger.h"
21	#include "Memory_wrapper.h"
22	#include "Numerics.h"
23	#include "PSLP_warnings.h"
24	#include "RowColViews.h"
25	#include "glbopts.h"
26	#include "stdlib.h"
27	#include "string.h"
28
29	Matrix matrix_new(const double Ax, const int Ai, const int Ap, size_t n_rows,	34✔
30	size_t n_cols, size_t nnz)
31	{
32	DEBUG(ASSERT_NO_ZEROS_D(Ax, nnz));	34✔
33	Matrix *A = matrix_alloc(n_rows, n_cols, nnz);	34✔
34	RETURN_PTR_IF_NULL(A, NULL);	34✔
35	size_t i, len;
36	int offset, row_size, row_alloc;
37
38	offset = 0;	34✔
39	for (i = 0; i < n_rows; ++i)	2,189✔
40	{
41	A->p[i].start = Ap[i] + offset;	2,155✔
42	len = (size_t) (Ap[i + 1] - Ap[i]);	2,155✔
43	memcpy(A->x + A->p[i].start, Ax + Ap[i], len * sizeof(double));	2,155✔
44	memcpy(A->i + A->p[i].start, Ai + Ap[i], len * sizeof(int));	2,155✔
45	A->p[i].end = Ap[i + 1] + offset;	2,155✔
46	row_size = A->p[i].end - A->p[i].start;	2,155✔
47	row_alloc = calc_memory_row(row_size, EXTRA_ROW_SPACE, EXTRA_MEMORY_RATIO);	2,155✔
48	offset += row_alloc - row_size;	2,155✔
49	}
50
51	A->p[n_rows].start = Ap[n_rows] + offset;	34✔
52	A->p[n_rows].end = A->p[n_rows].start;	34✔
53
54	return A;	34✔
55	}
56
57	// needed for the transpose function
58	Matrix *matrix_alloc(size_t n_rows, size_t n_cols, size_t nnz)	486✔
59	{
60	Matrix A = (Matrix ) ps_malloc(1, sizeof(Matrix));	486✔
61	RETURN_PTR_IF_NULL(A, NULL);	486✔
62
63	A->m = n_rows;	486✔
64	A->n = n_cols;	486✔
65	A->nnz = nnz;	486✔
66	A->n_alloc = calc_memory(nnz, n_rows, EXTRA_ROW_SPACE, EXTRA_MEMORY_RATIO);	486✔
67
68	#ifdef TESTING
69	A->i = (int *) ps_calloc(A->n_alloc, sizeof(int));	486✔
70	A->p = (RowRange *) ps_calloc(n_rows + 1, sizeof(RowRange));	486✔
71	A->x = (double *) ps_calloc(A->n_alloc, sizeof(double));	486✔
72	#else
73	A->i = (int *) ps_malloc(A->n_alloc, sizeof(int));
74	A->p = (RowRange *) ps_malloc(n_rows + 1, sizeof(RowRange));
75	A->x = (double *) ps_malloc(A->n_alloc, sizeof(double));
76	#endif
77
78	if (!A->i \|\| !A->p \|\| !A->x)	486✔
79	{
UNCOV 80	free_matrix(A);	×
81	return NULL;	×
82	}
83
84	return A;	486✔
85	}
86
87	Matrix matrix_new_no_extra_space(const double Ax, const int Ai, const int Ap,	99✔
88	size_t n_rows, size_t n_cols, size_t nnz)
89	{
90	Matrix A = (Matrix ) ps_malloc(1, sizeof(Matrix));	99✔
91	RETURN_PTR_IF_NULL(A, NULL);	99✔
92
93	A->m = n_rows;	99✔
94	A->n = n_cols;	99✔
95	A->nnz = nnz;	99✔
96	A->n_alloc = nnz;	99✔
97	A->i = (int *) ps_malloc(A->n_alloc, sizeof(int));	99✔
98	A->p = (RowRange *) ps_malloc(n_rows + 1, sizeof(RowRange));	99✔
99	A->x = (double *) ps_malloc(A->n_alloc, sizeof(double));	99✔
100
101	if (!A->i \|\| !A->p \|\| !A->x)	99✔
102	{
UNCOV 103	free_matrix(A);	×
104	return NULL;	×
105	}
106
107	memcpy(A->x, Ax, nnz * sizeof(double));	99✔
108	memcpy(A->i, Ai, nnz * sizeof(int));	99✔
109
110	for (int i = 0; i <= n_rows; ++i)	613✔
111	{
112	A->p[i].start = Ap[i];	514✔
113	A->p[i].end = Ap[i + 1];	514✔
114	}
115
116	return A;	99✔
117	}
118
119	Matrix transpose(const Matrix A, int *work_n_cols)	452✔
120	{
121	Matrix *AT = matrix_alloc(A->n, A->m, A->nnz);	452✔
122	RETURN_PTR_IF_NULL(AT, NULL);	452✔
123	int i, j, start;
124	int *count = work_n_cols;	452✔
125	memset(count, 0, A->n * sizeof(int));	452✔
126
127	// -------------------------------------------------------------------
128	// compute nnz in each column of A
129	// -------------------------------------------------------------------
130	for (i = 0; i < A->m; ++i)	2,374✔
131	{
132	for (j = A->p[i].start; j < A->p[i].end; ++j)	8,085✔
133	{
134	count[A->i[j]]++;	6,163✔
135	}
136	}
137	// ------------------------------------------------------------------
138	// compute row pointers, taking the extra space into account
139	// ------------------------------------------------------------------
140	AT->p[0].start = 0;	452✔
141	for (i = 0; i < A->n; ++i)	2,721✔
142	{
143	start = AT->p[i].start;	2,269✔
144	AT->p[i].end = start + count[i];	2,269✔
145	AT->p[i + 1].start =	2,269✔
146	start + calc_memory_row(count[i], EXTRA_ROW_SPACE, EXTRA_MEMORY_RATIO);	2,269✔
147	count[i] = start;	2,269✔
148	}
149
150	AT->p[A->n].start = (int) AT->n_alloc;	452✔
151	AT->p[A->n].end = (int) AT->n_alloc;	452✔
152
153	// ------------------------------------------------------------------
154	// fill transposed matrix (this is a bottleneck)
155	// ------------------------------------------------------------------
156	for (i = 0; i < A->m; ++i)	2,374✔
157	{
158	for (j = A->p[i].start; j < A->p[i].end; j++)	8,085✔
159	{
160	AT->x[count[A->i[j]]] = A->x[j];	6,163✔
161	AT->i[count[A->i[j]]] = i;	6,163✔
162	count[A->i[j]]++;	6,163✔
163	}
164	}
165
166	return AT;	452✔
167	}
168
169	size_t calc_memory(size_t nnz, size_t n_rows, size_t extra_row_space,	486✔
170	double memory_ratio)
171	{
172	/* disable conversion compiler warning*/
173	PSLP_DIAG_PUSH();
174	PSLP_DIAG_IGNORE_CONVERSION();
175
176	/* intentional truncation */
177	size_t result = (size_t) (nnz * memory_ratio) + n_rows * extra_row_space;	486✔
178
179	/* enable conversion compiler warnings */
180	PSLP_DIAG_POP();
181	return result;	486✔
182	}
183
184	int calc_memory_row(int size, int extra_row_space, double memory_ratio)	5,147✔
185	{
186	return (int) (size * memory_ratio) + extra_row_space;	5,147✔
187	}
188
189	void free_matrix(Matrix *A)	585✔
190	{
191	if (A)	585✔
192	{
193	PS_FREE(A->i);	585✔
194	PS_FREE(A->p);	585✔
195	PS_FREE(A->x);	585✔
196	}
197
198	PS_FREE(A);	585✔
199	}	585✔
200
201	void remove_extra_space(Matrix A, const int row_sizes, bool remove_all,	200✔
202	const int *col_idxs_map, size_t new_n_cols)
203	{
204	int j, start, end, len, row_alloc, curr;
205	int extra_row_space = (remove_all) ? 0 : EXTRA_ROW_SPACE;	200✔
206	double extra_mem_ratio = (remove_all) ? 1.0 : EXTRA_MEMORY_RATIO;	200✔
207	curr = 0;	200✔
208	size_t i, n_deleted_rows;
209
210	// --------------------------------------------------------------------------
211	// loop through the rows and remove redundant space, including inactive
212	// rows.
213	// --------------------------------------------------------------------------
214	n_deleted_rows = 0;	200✔
215	for (i = 0; i < A->m; ++i)	1,119✔
216	{
217	if (row_sizes[i] == SIZE_INACTIVE_ROW)	919✔
218	{
219	n_deleted_rows++;	196✔
220	continue;	196✔
221	}
222
223	start = A->p[i].start;	723✔
224	end = A->p[i].end;	723✔
225	len = end - start;	723✔
226	memmove(A->x + curr, A->x + start, (size_t) (len) * sizeof(double));	723✔
227	memmove(A->i + curr, A->i + start, (size_t) (len) * sizeof(int));	723✔
228	A->p[i - n_deleted_rows].start = curr;	723✔
229	A->p[i - n_deleted_rows].end = curr + len;	723✔
230	row_alloc = calc_memory_row(len, extra_row_space, extra_mem_ratio);	723✔
231	curr += row_alloc;	723✔
232	}
233
234	A->m -= n_deleted_rows;	200✔
235	A->p[A->m].start = curr;	200✔
236	A->p[A->m].end = curr;	200✔
237
238	// shrink size
239	A->x = (double *) ps_realloc(A->x, (size_t) MAX(curr, 1), sizeof(double));	200✔
240	A->i = (int *) ps_realloc(A->i, (size_t) MAX(curr, 1), sizeof(int));	200✔
241	A->p = (RowRange *) ps_realloc(A->p, (size_t) (A->m + 1), sizeof(RowRange));	200✔
242
243	// -------------------------------------------------------------------------
244	// update column indices
245	// -------------------------------------------------------------------------
246	A->n = new_n_cols;	200✔
247	for (i = 0; i < A->m; ++i)	923✔
248	{
249	for (j = A->p[i].start; j < A->p[i].end; ++j)	2,821✔
250	{
251	A->i[j] = col_idxs_map[A->i[j]];	2,098✔
252	}
253	}
254	}	200✔
255
256	bool shift_row(Matrix *A, int row, int extra_space, int max_shift)	28✔
257	{
258	int left, right, missing_space, remaining_shifts, left_shifts;
259	int right_shifts, space_left, space_right, n_move_right, n_move_left;
260	int next_start, next_end;
261	bool shift_left;
262	RowRange *row_r = A->p;	28✔
263	left = row;	28✔
264	right = row + 1;	28✔
265	remaining_shifts = max_shift;	28✔
266	left_shifts = 0;	28✔
267	right_shifts = 0;	28✔
268	missing_space = extra_space - (row_r[right].start - row_r[row].end);	28✔
269
270	if (missing_space <= 0)	28✔
271	{
272	return true;	2✔
273	}
274
275	// ------------------------------------------------------------------------
276	// compute the new start index for row 'row' and a lower bound on the start
277	// index for the the first active row following row 'row'.
278	// ------------------------------------------------------------------------
279	while (missing_space > 0)	84✔
280	{
281	if (left == 0 && right == A->m)	65✔
282	{
UNCOV 283	return false;	×
284	}
285
286	// space_left is the number of steps we can shift 'left' row to the
287	// left without overwriting row 'left - 1'.
288	// space_right is the number of steps we can shift 'right' row to
289	// the right without overwriting row 'right + 1'.
290	assert(left >= 0 && right <= A->m);	65✔
291	space_left = (left == 0) ? 0 : row_r[left].start - row_r[left - 1].end;	65✔
292	space_right =	65✔
293	(right == A->m) ? 0 : row_r[right + 1].start - row_r[right].end;	65✔
294	assert(space_left >= 0 && space_right >= 0);	65✔
295
296	// number of elements that must be moved left resp. right if we shift
297	// in a certain direction
298	n_move_right = row_r[right].end - row_r[right].start;	65✔
299	n_move_left = row_r[left].end - row_r[left].start;	65✔
300
301	// decide which direction to shift
302	if (left == 0)	65✔
303	{
304	if (right != A->m && n_move_right <= remaining_shifts)	7✔
305	{
306	shift_left = false;	5✔
307	}
308	else
309	{
310	return false;	2✔
311	}
312	}
313	else if (right == A->m)	58✔
314	{
315	if (left != 0 && n_move_left <= remaining_shifts)	5✔
316	{
317	shift_left = true;	4✔
318	}
319	else
320	{
321	return false;	1✔
322	}
323	}
324	else if (n_move_left == 0)	53✔
325	{
UNCOV 326	shift_left = true;	×
327	}
328	else if (n_move_right == 0)	53✔
329	{
330	shift_left = false;	11✔
331	}
332	else if (n_move_left <= remaining_shifts &&	42✔
333	(space_left / (double) (n_move_left) >=	37✔
334	space_right / (double) (n_move_right)))	37✔
335	{
336	shift_left = true;	16✔
337	}
338	else if (n_move_right <= remaining_shifts)	26✔
339	{
340	shift_left = false;	22✔
341	}
342	else
343	{
344	return false;	4✔
345	}
346
347	assert(!(shift_left && left == 0) && !(!shift_left && right == A->m));	58✔
348
349	if (shift_left)	58✔
350	{
351	left_shifts = MIN(missing_space, space_left);	20✔
352	missing_space -= left_shifts;	20✔
353	remaining_shifts -= n_move_left;	20✔
354	left -= 1;	20✔
355	}
356	else
357	{
358	right_shifts = MIN(missing_space, space_right);	38✔
359	missing_space -= right_shifts;	38✔
360	remaining_shifts -= n_move_right;	38✔
361	right += 1;	38✔
362	}
363	}
364	assert(remaining_shifts >= 0);	19✔
365
366	// ------------------------------------------------------------------------
367	// execute total left shift
368	// ------------------------------------------------------------------------
369	next_start = row_r[left + 1].start - left_shifts;	19✔
370	for (; left < row; left++)	39✔
371	{
372	int len = row_r[left + 1].end - row_r[left + 1].start;	20✔
373	if (len > 0)	20✔
374	{
375	memmove(A->x + next_start, A->x + row_r[left + 1].start,	20✔
376	((size_t) len) * sizeof(double));	20✔
377	memmove(A->i + next_start, A->i + row_r[left + 1].start,	20✔
378	((size_t) len) * sizeof(int));	20✔
379	}
380	row_r[left + 1].start = next_start;	20✔
381	row_r[left + 1].end = next_start + len;	20✔
382	next_start += len;	20✔
383	}
384
385	// ------------------------------------------------------------------------
386	// execute total right shift
387	// ------------------------------------------------------------------------
388	next_end = row_r[right - 1].end + right_shifts;	19✔
389	for (; right > row + 1; right--)	56✔
390	{
391	int len = row_r[right - 1].end - row_r[right - 1].start;	37✔
392	if (len > 0)	37✔
393	{
394	memmove(A->x + next_end - len, A->x + row_r[right - 1].start,	25✔
395	((size_t) len) * sizeof(double));	25✔
396	memmove(A->i + next_end - len, A->i + row_r[right - 1].start,	25✔
397	((size_t) len) * sizeof(int));	25✔
398	}
399	row_r[right - 1].start = next_end - len;	37✔
400	row_r[right - 1].end = next_end;	37✔
401	next_end = row_r[right - 1].start;	37✔
402	}
403
404	assert(row_r[row + 1].start - row_r[row].end == extra_space);	19✔
405	return true;	19✔
406	}
407
UNCOV 408	void print_row_starts(const RowRange *row_ranges, size_t len)	×
409	{
UNCOV 410	for (size_t i = 0; i < len; ++i)	×
411	{
UNCOV 412	printf("%d ", row_ranges[i].start);	×
413	}
UNCOV 414	printf("\n");	×
415	}	×
416
417	double insert_or_update_coeff(Matrix A, int row, int col, double val, int row_size)	61✔
418	{
419	int i, start, end, insertion;
420	double old_val = 0.0;	61✔
421	start = A->p[row].start;	61✔
422	end = A->p[row].end;	61✔
423	insertion = end;	61✔
424
425	// -----------------------------------------------------------------
426	// find where it should be inserted
427	// -----------------------------------------------------------------
428	for (i = start; i < end; ++i)	133✔
429	{
430	if (A->i[i] >= col)	129✔
431	{
432	insertion = i;	57✔
433	break;	57✔
434	}
435	}
436
437	// -----------------------------------------------------------------
438	// Insert the new value if it is nonzero. If it exists or should be
439	// inserted in the end, we don't need to shift values.
440	// -----------------------------------------------------------------
441	if (ABS(val) > ZERO_TOL)	61✔
442	{
443	// assert(!IS_ZERO_FEAS_TOL(val));
444	if (insertion == end)	51✔
445	{
446	A->x[insertion] = val;	4✔
447	A->i[insertion] = col;	4✔
448	A->p[row].end += 1;	4✔
449	A->nnz += 1;	4✔
450	*row_size += 1;	4✔
451	}
452	else if (A->i[insertion] == col)	47✔
453	{
454	old_val = A->x[insertion];	19✔
455	A->x[insertion] = val;	19✔
456	}
457	else
458	{
459	size_t len = (size_t) (end - insertion);	28✔
460	memmove(A->x + insertion + 1, A->x + insertion, len * sizeof(double));	28✔
461	memmove(A->i + insertion + 1, A->i + insertion, len * sizeof(int));	28✔
462
463	// insert new value
464	A->x[insertion] = val;	28✔
465	A->i[insertion] = col;	28✔
466	A->p[row].end += 1;	28✔
467	A->nnz += 1;	28✔
468	*row_size += 1;	28✔
469	}
470	}
471	// if the new value is zero, we just have to shift
472	else
473	{
474	// we only expect that the new value is zero if the coefficient
475	// already exists
476	assert(A->i[insertion] == col);	10✔
477
478	// we only have to shift values if the zero is not in the end
479	if (insertion != end - 1)	10✔
480	{
481	size_t len = (size_t) (end - insertion - 1);	6✔
482	memmove(A->x + insertion, A->x + insertion + 1, len * sizeof(double));	6✔
483	memmove(A->i + insertion, A->i + insertion + 1, len * sizeof(int));	6✔
484	}
485
486	A->p[row].end -= 1;	10✔
487	A->nnz -= 1;	10✔
488	*row_size -= 1;	10✔
489	}
490
491	assert(A->p[row].end <= A->p[row + 1].start);	61✔
492	return old_val;	61✔
493	}
494
495	void remove_coeff(RowView *row, int col)	35✔
496	{
497	int shift = 0;	35✔
498	int len = *row->len;	35✔
499	for (int i = 0; i < len; ++i)	194✔
500	{
501	if (row->cols[i] == col)	159✔
502	{
503	shift = 1;	35✔
504	}
505
506	row->vals[i] = row->vals[i + shift];	159✔
507	row->cols[i] = row->cols[i + shift];	159✔
508	}
509
510	assert(shift != 0);	35✔
511	(*row->range).end -= 1;	35✔
512	*row->len -= 1;	35✔
513	}	35✔
514
515	void count_rows(const Matrix A, int row_sizes)	198✔
516	{
517	for (int i = 0; i < A->m; ++i)	1,087✔
518	{
519	row_sizes[i] = A->p[i].end - A->p[i].start;	889✔
520	}
521	}	198✔
522
523	#ifdef TESTING
524	// Function to create a random CSR matrix
525	Matrix *random_matrix_new(size_t n_rows, size_t n_cols, double density)	2✔
526	{
527	// allocate memory
528
529	/* disable conversion compiler warning*/
530	PSLP_DIAG_PUSH();
531	PSLP_DIAG_IGNORE_CONVERSION();
532	/* intentional truncation */
533	size_t n_alloc_nnz = (size_t) (density * n_rows * n_cols);	2✔
534
535	/* enable conversion compiler warnings */
536	PSLP_DIAG_POP();
537	double Ax = (double ) ps_malloc(n_alloc_nnz, sizeof(double));	2✔
538	int Ai = (int ) ps_malloc(n_alloc_nnz, sizeof(int));	2✔
539	int Ap = (int ) ps_malloc(n_rows + 1, sizeof(int));	2✔
540	if (!Ax \|\| !Ai \|\| !Ap)	2✔
541	{
UNCOV 542	PS_FREE(Ax);	×
UNCOV 543	PS_FREE(Ai);	×
UNCOV 544	PS_FREE(Ap);	×
UNCOV 545	return NULL;	×
546	}
547
548	// Initialize random number generator
549	srand(1);	2✔
550
551	size_t nnz_count = 0; // Counter for nonzero elements	2✔
552	Ap[0] = 0;	2✔
553
554	for (size_t i = 0; i < n_rows; ++i)	2,002✔
555	{
556	size_t row_nnz = 0;	2,000✔
557
558	// Randomly determine the number of nonzeros in this row
559	for (size_t j = 0; j < n_cols; ++j)	3,999,508✔
560	{
561	if ((double) rand() / RAND_MAX < density)	3,997,510✔
562	{
563	if (nnz_count >= n_alloc_nnz)	400,002✔
564	{
565	break;	2✔
566	}
567
568	Ax[nnz_count] = ((double) (rand() - rand()) / RAND_MAX) * 20.0;	400,000✔
569	Ai[nnz_count] = (int) j;	400,000✔
570	++nnz_count;	400,000✔
571	++row_nnz;	400,000✔
572	}
573	}
574	Ap[i + 1] = Ap[i] + (int) row_nnz;	2,000✔
575	}
576
577	// create matrix in modified CSR format
578	Matrix *A = matrix_new(Ax, Ai, Ap, n_rows, n_cols, nnz_count);	2✔
579	PS_FREE(Ax);	2✔
580	PS_FREE(Ai);	2✔
581	PS_FREE(Ap);	2✔
582
583	return A;	2✔
584	}
585
586	void replace_row_A(Matrix A, int row, double ratio, double new_vals, int *cols_new,	42✔
587	int new_len)
588	{
589	int i, len, start, n_new_elements;
590	len = A->p[row].end - A->p[row].start;	42✔
591	n_new_elements = new_len - len;	42✔
592
593	// potentially shift row to get extra space
594	if (n_new_elements > 0)	42✔
595	{
596	assert(shift_row(A, row, n_new_elements, 2000));	8✔
597	}
598
599	// replace the row
600	start = A->p[row].start;	42✔
601	for (i = 0; i < new_len; ++i)	8,078✔
602	{
603	A->x[start + i] = ratio * new_vals[i];	8,036✔
604	A->i[start + i] = cols_new[i];	8,036✔
605	}
606	A->p[row].end = A->p[row].start + new_len;	42✔
607	assert(A->p[row].end <= A->p[row + 1].start);	42✔
608	}	42✔
609
610	#endif

dance858 / PSLP / 22260349136

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