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dwarf2out.c (round_up_to_align): New static function. 

* dwarf2out.c (round_up_to_align): New static function.
	(field_byte_offset): Use it to round the offset.

From-SVN: r121859
This commit is contained in:
Eric Botcazou 2007-02-12 20:52:37 +00:00 committed by Eric Botcazou
parent ffcce7bcd8
commit d996473d67
2 changed files with 27 additions and 6 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2007-02-12 Eric Botcazou <ebotcazou@adacore.com>
* dwarf2out.c (round_up_to_align): New static function.
(field_byte_offset): Use it to round the offset.
2007-02-12 Richard Henderson <rth@redhat.com>
* config/alpha/alpha.md (bswapsi2, bswapdi2): New.

28
gcc/dwarf2out.c
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@ -9626,6 +9626,24 @@ simple_decl_align_in_bits (tree decl)
return (TREE_CODE (decl) != ERROR_MARK) ? DECL_ALIGN (decl) : BITS_PER_WORD;
}
/* Return the result of rounding T up to ALIGN. */
static inline HOST_WIDE_INT
round_up_to_align (HOST_WIDE_INT t, unsigned int align)
{
/* We must be careful if T is negative because HOST_WIDE_INT can be
either "above" or "below" unsigned int as per the C promotion
rules, depending on the host, thus making the signedness of the
direct multiplication and division unpredictable. */
unsigned HOST_WIDE_INT u = (unsigned HOST_WIDE_INT) t;
u += align - 1;
u /= align;
u *= align;
return (HOST_WIDE_INT) u;
}
/* Given a pointer to a FIELD_DECL, compute and return the byte offset of the
lowest addressed byte of the "containing object" for the given FIELD_DECL,
or return 0 if we are unable to determine what that offset is, either
@ -9725,9 +9743,8 @@ field_byte_offset (tree decl)
object_offset_in_bits = deepest_bitpos - type_size_in_bits;
/* Round up to type_align by default. This works best for bitfields. */
object_offset_in_bits += type_align_in_bits - 1;
object_offset_in_bits /= type_align_in_bits;
object_offset_in_bits *= type_align_in_bits;
object_offset_in_bits
= round_up_to_align (object_offset_in_bits, type_align_in_bits);
if (object_offset_in_bits > bitpos_int)
{
@ -9735,9 +9752,8 @@ field_byte_offset (tree decl)
object_offset_in_bits = deepest_bitpos - type_size_in_bits;
/* Round up to decl_align instead. */
object_offset_in_bits += decl_align_in_bits - 1;
object_offset_in_bits /= decl_align_in_bits;
object_offset_in_bits *= decl_align_in_bits;
object_offset_in_bits
= round_up_to_align (object_offset_in_bits, decl_align_in_bits);
}
return object_offset_in_bits / BITS_PER_UNIT;