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backport: re PR tree-optimization/53438 (Bitfield store replaced with full-byte store) 

2012-05-28  Bill Schmidt  <wschmidt@linux.ibm.com>

	Backport from mainline
        2012-05-23  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/53438
	* tree-sra.c (analyze_access_subtree): Correct bitfield exclusion.

From-SVN: r187930
This commit is contained in:
Bill Schmidt 2012-05-28 13:58:18 +00:00 committed by William Schmidt
parent 57bcbaa69b
commit b581071734
2 changed files with 12 additions and 1 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2012-05-28 Bill Schmidt <wschmidt@linux.ibm.com>
Backport from mainline
2012-05-28 Richard Guenther <rguenther@suse.de>
PR tree-optimization/53438
* tree-sra.c (analyze_access_subtree): Correct bitfield exclusion.
2012-05-26 Eric Botcazou <ebotcazou@adacore.com>
Backport from mainline

5
gcc/tree-sra.c
View File

@ -2181,9 +2181,12 @@ analyze_access_subtree (struct access *root, struct access *parent,
&& (TREE_CODE (root->type) != INTEGER_TYPE
|| TYPE_PRECISION (root->type) != root->size)
/* But leave bitfield accesses alone. */
&& (root->offset % BITS_PER_UNIT) == 0)
&& (TREE_CODE (root->expr) != COMPONENT_REF
|| !DECL_BIT_FIELD (TREE_OPERAND (root->expr, 1))))
{
tree rt = root->type;
gcc_assert ((root->offset % BITS_PER_UNIT) == 0
&& (root->size % BITS_PER_UNIT) == 0);
root->type = build_nonstandard_integer_type (root->size,
TYPE_UNSIGNED (rt));
root->expr = build_ref_for_offset (UNKNOWN_LOCATION,