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(layout_record): Take account of

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maximum_field_alignment when using the field's alignment.

From-SVN: r1739
This commit is contained in:
Richard Stallman 1992-08-01 18:08:36 +00:00
parent 88dd95c1c0
commit e2301a83da
1 changed files with 17 additions and 1 deletions
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18
gcc/stor-layout.c
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@ -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