centralized performance resources

ocw/1/matrix-multiply/matrix_multiply.c

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+/**
+ * Copyright (c) 2012 MIT License by 6.172 Staff
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ **/
+
+#include "./matrix_multiply.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <math.h>
+#include <string.h>
+
+// #include "./tbassert.h"
+
+// Allocates a row-by-cols matrix and returns it
+matrix* make_matrix(int rows, int cols) {
+  matrix* new_matrix = malloc(sizeof(matrix));
+
+  // Set the number of rows and columns
+  new_matrix->rows = rows;
+  new_matrix->cols = cols;
+
+  // Allocate a buffer big enough to hold the matrix.
+  new_matrix->values = (int**)malloc(sizeof(int*) * rows);
+  for (int i = 0; i < rows; i++) {
+    new_matrix->values[i] = (int*)malloc(sizeof(int) * cols);
+  }
+
+  return new_matrix;
+}
+
+// Frees an allocated matrix
+void free_matrix(matrix* m) {
+  for (int i = 0; i < m->rows; i++) {
+    free(m->values[i]);
+  }
+  free(m->values);
+  free(m);
+}
+
+// Print matrix
+void print_matrix(const matrix* m) {
+  printf("------------\n");
+  for (int i = 0; i < m->rows; i++) {
+    for (int j = 0; j < m->cols; j++) {
+      printf("  %3d  ", m->values[i][j]);
+    }
+    printf("\n");
+  }
+  printf("------------\n");
+}
+
+
+// Multiply matrix A*B, store result in C.
+int matrix_multiply_run(const matrix* A, const matrix* B, matrix* C) {
+  /*
+  tbassert(A->cols == B->rows,
+           "A->cols = %d, B->rows = %d\n", A->cols, B->rows);
+  tbassert(A->rows == C->rows,
+           "A->rows = %d, C->rows = %d\n", A->rows, C->rows);
+  tbassert(B->cols == C->cols,
+           "B->cols = %d, C->cols = %d\n", B->cols, C->cols);
+  */
+
+  for (int i = 0; i < A->rows; i++) {
+    for (int j = 0; j < B->cols; j++) {
+      for (int k = 0; k < A->cols; k++) {
+        C->values[i][j] += A->values[i][k] * B->values[k][j];
+      }
+    }
+  }
+
+  return 0;
+}