add missing include for smpi_options

[simgrid.git] / src / mc / sosp / PageStore.cpp

diff --git a/src/mc/sosp/PageStore.cpp b/src/mc/sosp/PageStore.cpp
index 21a9ea21f30f10dbb09aac6db85e4926f3fc6509..e11d6532b42f8e7a0b089b3c537ea4a76a2ca5e7 100644 (file)
--- a/src/mc/sosp/PageStore.cpp
+++ b/src/mc/sosp/PageStore.cpp
@@ -12,15 +12,15 @@
 #include "xbt/log.h"
 #include "xbt/sysdep.h"
 
+#ifdef SG_HAVE_CPP14
 #include "src/include/xxhash.hpp"
+#endif
 #include "src/mc/mc_mmu.hpp"
 #include "src/mc/sosp/PageStore.hpp"
 
 #include <cstring> // memcpy, memcmp
 #include <unistd.h>
 
-XBT_LOG_NEW_DEFAULT_SUBCATEGORY(mc_page_snapshot, mc, "Logging specific to mc_page_snapshot");
-
 namespace simgrid {
 namespace mc {
 
@@ -34,7 +34,18 @@ namespace mc {
  */
 static XBT_ALWAYS_INLINE PageStore::hash_type mc_hash_page(const void* data)
 {
+#ifdef SG_HAVE_CPP14
   return xxh::xxhash<64>(data, xbt_pagesize);
+#else
+  const std::uint64_t* values = (const uint64_t*)data;
+  std::size_t n               = xbt_pagesize / sizeof(uint64_t);
+
+  // This djb2:
+  std::uint64_t hash = 5381;
+  for (std::size_t i = 0; i != n; ++i)
+    hash = ((hash << 5) + hash) + values[i];
+  return hash;
+#endif
 }
 
 // ***** snapshot_page_manager
@@ -79,7 +90,7 @@ void PageStore::resize(std::size_t size)
     // Check if expanding worked
     if (new_memory != (char*)this->memory_ + old_bytesize) {
       // New memory segment could not be put at the end of this->memory_,
-      // so cancel this one and try to rellocate everything and copy data
+      // so cancel this one and try to relocate everything and copy data
       munmap(new_memory, new_bytesize - old_bytesize);
       new_memory =
           mmap(nullptr, new_bytesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_POPULATE, -1, 0);