temp: builtin alignment

Author: hzhou

src/mpi/datatype/typeutil.c

@@ -234,6 +234,31 @@ int MPIR_Datatype_builtintype_alignment(MPI_Datatype type)
     if (type == MPI_DATATYPE_NULL)
         return 1;
 
+    /* FIXME: set these alignment in configure */
+    switch (type) {
+        case MPIR_SIGNED_INT1:
+        case MPIR_UNSIGNED_INT1:
+            return ALIGNOF_INT8_T;
+        case MPIR_SIGNED_INT2:
+        case MPIR_UNSIGNED_INT2:
+            return ALIGNOF_INT16_T;
+        case MPIR_SIGNED_INT4:
+        case MPIR_UNSIGNED_INT4:
+            return ALIGNOF_INT32_T;
+        case MPIR_SIGNED_INT8:
+        case MPIR_UNSIGNED_INT8:
+            return ALIGNOF_INT64_T;
+        case MPIR_FLOAT4:
+            return ALIGNOF_FLOAT;
+        case MPIR_FLOAT8:
+            return ALIGNOF_DOUBLE;
+        case MPIR_FLOAT16:
+            return ALIGNOF_LONG_DOUBLE;
+        default:
+            /* handle error cases? */
+            return 1;
+    }
+
     int size = MPIR_Datatype_get_basic_size(type);
 
     if (type == MPI_CHAR || type == MPI_UNSIGNED_CHAR || type == MPI_SIGNED_CHAR) {