(layout_record): Take account of

maximum_field_alignment when using the field's alignment.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@1739 138bc75d-0d04-0410-961f-82ee72b054a4

diff --git a/gcc/stor-layout.c b/gcc/stor-layout.c
index e220284..b2e3303 100644 (file)
--- a/gcc/stor-layout.c
+++ b/gcc/stor-layout.c
@@ -327,7 +327,13 @@ layout_record (rec)
          /* A named bit field of declared type `int'
             forces the entire structure to have `int' alignment.  */
          if (DECL_NAME (field) != 0)
-           record_align = MAX (record_align, TYPE_ALIGN (TREE_TYPE (field)));
+           {
+             int type_align = TYPE_ALIGN (TREE_TYPE (field));
+             if (maximum_field_alignment != 0)
+               type_align = MIN (type_align, maximum_field_alignment);
+
+             record_align = MAX (record_align, type_align);
+           }
        }
       else
        record_align = MAX (record_align, desired_align);
@@ -371,8 +377,15 @@ layout_record (rec)
          register tree dsize = DECL_SIZE (field);
          int field_size = TREE_INT_CST_LOW (dsize);
 
+         if (maximum_field_alignment != 0)
+           type_align = MIN (type_align, maximum_field_alignment);
+
          /* A bit field may not span the unit of alignment of its type.
             Advance to next boundary if necessary.  */
+         /* ??? There is some uncertainty here as to what
+            should be done if type_align is less than the width of the type.
+            That can happen because the width exceeds BIGGEST_ALIGNMENT
+            or because it exceeds maximum_field_alignment.  */
          if (const_size / type_align
              != (const_size + field_size - 1) / type_align)
            const_size = CEIL (const_size, type_align) * type_align;
@@ -393,6 +406,9 @@ layout_record (rec)
          register tree dsize = DECL_SIZE (field);
          int field_size = TREE_INT_CST_LOW (dsize);
 
+         if (maximum_field_alignment != 0)
+           type_align = MIN (type_align, maximum_field_alignment);
+
          /* A bit field may not span the unit of alignment of its type.
             Advance to next boundary if necessary.  */
          if (const_size / type_align