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foldaddr-3.c: New file. 

* gcc.dg/tree-ssa/foldaddr-3.c: New file.

	* tree-ssa-ccp (maybe_fold_offset_to_component_ref): Recurse into
	multiple fields of union.

From-SVN: r123674
This commit is contained in:
Jan Hubicka 2007-04-09 19:00:10 +02:00 committed by Jan Hubicka
parent ea798d0f66
commit 6e6e19cbf5
4 changed files with 53 additions and 3 deletions
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5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2007-04-09 Jan Hubicka <jh@suse.cz>
* tree-ssa-ccp (maybe_fold_offset_to_component_ref): Recurse into
multiple fields of union.
2007-04-09 Zdenek Dvorak <dvorakz@suse.cz>
* cfgloopmanip.c (create_preheader): Do not use loop_preheader_edge.

4
gcc/testsuite/ChangeLog
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@ -1,3 +1,7 @@
2007-04-09 Jan Hubicka <jh@suse.cz>
* gcc.dg/tree-ssa/foldaddr-3.c: New file.
2007-04-08 Jan Hubicka <jh@suse.cz>
* gcc.dg/tree-ssa/foldaddr-2.c: New file.

28
gcc/testsuite/gcc.dg/tree-ssa/foldaddr-3.c Normal file
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@ -0,0 +1,28 @@
/* { dg-do compile } */
/* { dg-options "-O1 -fdump-tree-optimized" } */
union a
{
struct s1
{
long long a;
long long b;
} s1;
struct s2
{
int c;
int d;
} s2;
struct s3
{
unsigned long long e;
unsigned long long f;
} s3;
} a;
int *
t ()
{
return (int *) &a;
}
/* { dg-final { scan-tree-dump "a.s2.c" "optimized"} } */
/* { dg-final { cleanup-tree-dump "optimized" } } */

19
gcc/tree-ssa-ccp.c
View File

@ -1648,6 +1648,8 @@ maybe_fold_offset_to_component_ref (tree record_type, tree base, tree offset,
tree orig_type, bool base_is_ptr)
{
tree f, t, field_type, tail_array_field, field_offset;
tree ret;
tree new_base;
if (TREE_CODE (record_type) != RECORD_TYPE
&& TREE_CODE (record_type) != UNION_TYPE
@ -1719,8 +1721,20 @@ maybe_fold_offset_to_component_ref (tree record_type, tree base, tree offset,
/* If we matched, then set offset to the displacement into
this field. */
offset = t;
goto found;
if (base_is_ptr)
new_base = build1 (INDIRECT_REF, record_type, base);
else
new_base = base;
new_base = build3 (COMPONENT_REF, field_type, new_base, f, NULL_TREE);
/* Recurse to possibly find the match. */
ret = maybe_fold_offset_to_array_ref (new_base, t, orig_type);
if (ret)
return ret;
ret = maybe_fold_offset_to_component_ref (field_type, new_base, t,
orig_type, false);
if (ret)
return ret;
}
if (!tail_array_field)
@ -1730,7 +1744,6 @@ maybe_fold_offset_to_component_ref (tree record_type, tree base, tree offset,
field_type = TREE_TYPE (f);
offset = int_const_binop (MINUS_EXPR, offset, byte_position (f), 1);
found:
/* If we get here, we've got an aggregate field, and a possibly
nonzero offset into them. Recurse and hope for a valid match. */
if (base_is_ptr)