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stor-layout.c (compute_record_mode): Don't force BLKmode if field is zero-length BLKmode. 

* stor-layout.c (compute_record_mode): Don't force BLKmode if
	field is zero-length BLKmode.
	* expr.c (expand_expr, case COMPONENT_REF): Handle case of BLKmode
	zero-size references.

From-SVN: r72311
This commit is contained in:
Richard Kenner 2003-10-10 19:21:12 +00:00 committed by Richard Kenner
parent 892c9f1f53
commit 7a06d606a6
3 changed files with 17 additions and 6 deletions
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5
gcc/ChangeLog
View File

@ -1,5 +1,10 @@
2003-10-10 Richard Kenner <kenner@vlsi1.ultra.nyu.edu>
* stor-layout.c (compute_record_mode): Don't force BLKmode if
field is zero-length BLKmode.
* expr.c (expand_expr, case COMPONENT_REF): Handle case of BLKmode
zero-size references.
* combine.c (distribute_links): Properly test for REG being set.
* config/alpha/alpha.c (alpha_expand_block_mode): Don't use

14
gcc/expr.c
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@ -7223,6 +7223,12 @@ expand_expr (tree exp, rtx target, enum machine_mode tmode,
if (ext_mode == BLKmode)
{
if (target == 0)
target = assign_temp (type, 0, 1, 1);
if (bitsize == 0)
return target;
/* In this case, BITPOS must start at a byte boundary and
TARGET, if specified, must be a MEM. */
if (GET_CODE (op0) != MEM
@ -7230,11 +7236,9 @@ expand_expr (tree exp, rtx target, enum machine_mode tmode,
|| bitpos % BITS_PER_UNIT != 0)
abort ();
op0 = adjust_address (op0, VOIDmode, bitpos / BITS_PER_UNIT);
if (target == 0)
target = assign_temp (type, 0, 1, 1);
emit_block_move (target, op0,
emit_block_move (target,
adjust_address (op0, VOIDmode,
bitpos / BITS_PER_UNIT),
GEN_INT ((bitsize + BITS_PER_UNIT - 1)
/ BITS_PER_UNIT),
(modifier == EXPAND_STACK_PARM

4
gcc/stor-layout.c
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@ -1318,7 +1318,9 @@ compute_record_mode (tree type)
if (TREE_CODE (TREE_TYPE (field)) == ERROR_MARK
|| (TYPE_MODE (TREE_TYPE (field)) == BLKmode
&& ! TYPE_NO_FORCE_BLK (TREE_TYPE (field)))
&& ! TYPE_NO_FORCE_BLK (TREE_TYPE (field))
&& !(TYPE_SIZE (TREE_TYPE (field)) != 0
&& integer_zerop (TYPE_SIZE (TREE_TYPE (field)))))
|| ! host_integerp (bit_position (field), 1)
|| DECL_SIZE (field) == 0
|| ! host_integerp (DECL_SIZE (field), 1))