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tree-dfa.c (get_ref_base_and_extent): Adjust maximum access size for DECL bases. 

2009-11-23  Richard Guenther  <rguenther@suse.de>

	* tree-dfa.c (get_ref_base_and_extent): Adjust maximum access
	size for DECL bases.

From-SVN: r154433
This commit is contained in:
Richard Guenther 2009-11-23 10:44:17 +00:00 committed by Richard Biener
parent 5120dc389f
commit 0230277c25
2 changed files with 21 additions and 6 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2009-11-23 Richard Guenther <rguenther@suse.de>
* tree-dfa.c (get_ref_base_and_extent): Adjust maximum access
size for DECL bases.
2009-11-22 Richard Henderson <rth@redhat.com>
* i386.c (avx_vpermilp_parallel): New function.

22
gcc/tree-dfa.c
View File

@ -914,13 +914,23 @@ get_ref_base_and_extent (tree exp, HOST_WIDE_INT *poffset,
the array. The simplest way to conservatively deal with this
is to punt in the case that offset + maxsize reaches the
base type boundary. This needs to include possible trailing padding
that is there for alignment purposes. */
that is there for alignment purposes.
if (seen_variable_array_ref
&& maxsize != -1
&& (!host_integerp (TYPE_SIZE (TREE_TYPE (exp)), 1)
|| (bit_offset + maxsize
== (signed) TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (exp))))))
That is of course only true if the base object is not a decl. */
if (DECL_P (exp))
{
/* If maxsize is unknown adjust it according to the size of the
base decl. */
if (maxsize == -1
&& host_integerp (DECL_SIZE (exp), 1))
maxsize = TREE_INT_CST_LOW (DECL_SIZE (exp)) - bit_offset;
}
else if (seen_variable_array_ref
&& maxsize != -1
&& (!host_integerp (TYPE_SIZE (TREE_TYPE (exp)), 1)
|| (bit_offset + maxsize
== (signed) TREE_INT_CST_LOW (TYPE_SIZE (TREE_TYPE (exp))))))
maxsize = -1;
/* ??? Due to negative offsets in ARRAY_REF we can end up with