[Bug middle-end/20371] Some corner cases of MS bitfields don't work

["cvs-commit at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Additional Comments From cvs-commit at gcc dot gnu dot org  2005-05-11 12:25 -------
Subject: Bug 20371

CVSROOT:	/cvs/gcc
Module name:	gcc
Changes by:	amylaar@gcc.gnu.org	2005-05-11 12:24:50

Modified files:
	gcc            : ChangeLog stor-layout.c tree.h 

Log message:
	PR middle-end/20371:
	* tree.h (record_layout_info_s): New member prev_packed.
	* stor-layout.c (update_alignment_for_field): Fix comment about
	KNOWN_ALIGN.  For MS bitfields, if we start a new run, make sure
	we start it properly aligned.
	(place_field): At the beginning of a record, pass 0 as KNOWN_ALIGN
	to update_alignment_for_field, and recompute it afterwards using
	the alignment of the record.
	When a packed bitfield precedes an MS bitfield, don't add padding
	at the end of the packed bitfield on behalf of the base type of
	the packed bit field.
	Don't adjust rli->bitpos at the end
	of an MS bitfield run if we already adjusted bitpos/offset for an
	alignment as large or larger than the bitfield type size.
	Take possible record alignment > BIGGEST_ALIGNMENT into account
	when calculating actual_align.
	Only put packed buit fields into rli->prev_field if they end up
	suitably aligned.
	Also set rli->remaining_in_alignment when we re-set rli->prev_field.
	Update rli->remaining_in_alignment when we have already started a
	run of bit fields and we process a packed bit field.

Patches:
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/ChangeLog.diff?cvsroot=gcc&r1=2.8728&r2=2.8729
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/stor-layout.c.diff?cvsroot=gcc&r1=1.230&r2=1.231
http://gcc.gnu.org/cgi-bin/cvsweb.cgi/gcc/gcc/tree.h.diff?cvsroot=gcc&r1=1.725&r2=1.726



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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20371