Sync from v0.13

csrc/cpu/scratchpad_manager.cpp

@@ -0,0 +1,23 @@
+#include <cstdlib>
+
+#include "scratchpad_manager.h"
+
+DNNLScratchPadManager::DNNLScratchPadManager() : size_(0), ptr_(nullptr) {
+  this->realloc(allocation_unit * 128);
+}
+
+void DNNLScratchPadManager::realloc(size_t new_size) {
+  new_size = round(new_size);
+  if (new_size > size_) {
+    if (ptr_ != nullptr) {
+      std::free(ptr_);
+    }
+    ptr_ = std::aligned_alloc(64, new_size);
+    size_ = new_size;
+  }
+}
+
+DNNLScratchPadManager* DNNLScratchPadManager::get_dnnl_scratchpad_manager() {
+  static DNNLScratchPadManager manager;
+  return &manager;
+}