Add support for aligned allocations on Windows

src/memory.cpp

@@ -49,6 +49,8 @@ void *Memory::smalloc(bigint nbytes, const char *name)
 
 #if defined(LMP_USE_TBB_ALLOCATOR)
   ptr = scalable_aligned_malloc(nbytes, LAMMPS_MEMALIGN);
+#elif defined(_WIN32)
+  ptr = _aligned_malloc(nbytes, LAMMPS_MEMALIGN);
 #else
   int retval = posix_memalign(&ptr, LAMMPS_MEMALIGN, nbytes);
   if (retval) ptr = NULL;
@@ -109,6 +111,8 @@ void Memory::sfree(void *ptr)
   if (ptr == NULL) return;
   #if defined(LMP_USE_TBB_ALLOCATOR)
   scalable_aligned_free(ptr);
+  #elif defined(_WIN32)
+  _aligned_free(ptr);
   #else
   free(ptr);
   #endif

src/my_page.h

@@ -220,8 +220,14 @@ class MyPage {
     for (int i = npage-pagedelta; i < npage; i++) {
 #if defined(LAMMPS_MEMALIGN)
       void *ptr;
+#ifdef _WIN32
+      ptr = _aligned_malloc(pagesize*sizeof(T), LAMMPS_MEMALIGN);
+      if(ptr == NULL)
+        errorflag = 2;
+#else
       if (posix_memalign(&ptr, LAMMPS_MEMALIGN, pagesize*sizeof(T)))
         errorflag = 2;
+#endif
       pages[i] = (T *) ptr;
 #else
       pages[i] = (T *) malloc(pagesize*sizeof(T));