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stor-layout.c (layout_decl): Only set DECL_MODE if not already set.

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* stor-layout.c (layout_decl): Only set DECL_MODE if not already set.
	(place_field): Properly compute know and actual alignment.

From-SVN: r33312
This commit is contained in:
Richard Kenner 2000-04-21 19:19:24 +00:00 • committed by Richard Kenner
parent cdd83c3137
commit 4b6bf620d4
2 changed files with 13 additions and 5 deletions
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3
gcc/ChangeLog
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@ -1,5 +1,8 @@
Fri Apr 21 13:30:26 2000 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* stor-layout.c (layout_decl): Only set DECL_MODE if not already set.
(place_field): Properly compute know and actual alignment.
* gengenrtl.c (gencode): Write obstack_alloc_rtx function start
in proper format.

15
gcc/stor-layout.c
View file

@ -306,10 +306,12 @@ layout_decl (decl, known_align)
also happens with other fields. For example, the C++ front-end creates
zero-sized fields corresponding to empty base classes, and depends on
layout_type setting DECL_FIELD_BITPOS correctly for the field. Set the
size in bytes from the size in bits. */
size in bytes from the size in bits. If we have already set the mode,
don't set it again since we can be called twice for FIELD_DECLs. */
DECL_MODE (decl) = TYPE_MODE (type);
TREE_UNSIGNED (decl) = TREE_UNSIGNED (type);
if (DECL_MODE (decl) == VOIDmode)
DECL_MODE (decl) = TYPE_MODE (type);
if (DECL_SIZE (decl) == 0)
{
@ -642,9 +644,11 @@ place_field (rli, field)
/* Work out the known alignment so far. Note that A & (-A) is the
value of the least-significant bit in A that is one. */
if (! integer_zerop (rli->bitpos) && TREE_CONSTANT (rli->offset))
if (! integer_zerop (rli->bitpos))
known_align = (tree_low_cst (rli->bitpos, 1)
& - tree_low_cst (rli->bitpos, 1));
else if (integer_zerop (rli->offset))
known_align = BIGGEST_ALIGNMENT;
else if (host_integerp (rli->offset, 1))
known_align = (BITS_PER_UNIT
* (tree_low_cst (rli->offset, 1)
@ -833,10 +837,11 @@ place_field (rli, field)
/* If this field ended up more aligned than we thought it would be (we
approximate this by seeing if its position changed), lay out the field
again; perhaps we can use an integral mode for it now. */
if (! integer_zerop (DECL_FIELD_BIT_OFFSET (field))
&& TREE_CONSTANT (DECL_FIELD_OFFSET (field)))
if (! integer_zerop (DECL_FIELD_BIT_OFFSET (field)))
actual_align = (tree_low_cst (DECL_FIELD_BIT_OFFSET (field), 1)
& - tree_low_cst (DECL_FIELD_BIT_OFFSET (field), 1));
else if (integer_zerop (DECL_FIELD_OFFSET (field)))
actual_align = BIGGEST_ALIGNMENT;
else if (host_integerp (DECL_FIELD_OFFSET (field), 1))
actual_align = (BITS_PER_UNIT
* (tree_low_cst (DECL_FIELD_OFFSET (field), 1)