padding

src/rebound.h

@@ -110,9 +110,21 @@ struct reb_particle {
     double r;                   // physical radius
     double last_collision;      // Last time the particle had a physical collision.
     struct reb_treecell* c;     // Pointer to the cell the particle is currently in.
+#if !defined(_LP64)
+    char pad1[4];   // c is short by 4 bytes
+#endif
     uint32_t hash;              // Hash, can be used to identify particle.
+#if !defined(_LP64)
+    char pad2[4];   // ap is not padded to 8 bytes
+#endif
     void* ap;                   // This pointer allows REBOUNDx to add additional properties to the particle.
+#if !defined(_LP64)
+    char pad3[4];   // ap is short by 4 bytes
+#endif
     struct reb_simulation* sim; // Pointer to the parent simulation.
+#if !defined(_LP64)
+    char pad4[4];   // sim is short by 4 bytes
+#endif
 };
 
 // Generic 3d vector