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re PR tree-optimization/43783 (-O -ftree-pre options compile libbid wrong)

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2010-04-19  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/43783
	* tree-ssa-pre.c (create_component_ref_by_pieces_1): Drop
	constant ARRAY_REF operands two and three if possible.

	* gcc.c-torture/execute/pr43783.c: New testcase.

From-SVN: r158517
This commit is contained in:
Richard Guenther 2010-04-19 13:36:54 +00:00 committed by Richard Biener
parent 90f775a9c7
commit d53bed0b2c
4 changed files with 59 additions and 12 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2010-04-19 Richard Guenther <rguenther@suse.de>
PR tree-optimization/43783
* tree-ssa-pre.c (create_component_ref_by_pieces_1): Drop
constant ARRAY_REF operands two and three if possible.
2010-04-19 Uros Bizjak <ubizjak@gmail.com>
PR target/43766

5
gcc/testsuite/ChangeLog
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@ -1,3 +1,8 @@
2010-04-19 Richard Guenther <rguenther@suse.de>
PR tree-optimization/43783
* gcc.c-torture/execute/pr43783.c: New testcase.
2010-04-19 Uros Bizjak <ubizjak@gmail.com>
PR target/43766

21
gcc/testsuite/gcc.c-torture/execute/pr43783.c Normal file
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@ -0,0 +1,21 @@
typedef __attribute__((aligned(16)))
struct {
unsigned long long w[3];
} UINT192;
UINT192 bid_Kx192[32];
extern void abort (void);
int main()
{
int i = 0;
unsigned long x = 0;
for (i = 0; i < 32; ++i)
bid_Kx192[i].w[1] = i == 1;
for (i = 0; i < 32; ++i)
x += bid_Kx192[1].w[1];
if (x != 32)
abort ();
return 0;
}

39
gcc/tree-ssa-pre.c
View File

@ -2779,22 +2779,37 @@ create_component_ref_by_pieces_1 (basic_block block, vn_reference_t ref,
return NULL_TREE;
if (genop2)
{
op2expr = get_or_alloc_expr_for (genop2);
genop2 = find_or_generate_expression (block, op2expr, stmts,
domstmt);
if (!genop2)
return NULL_TREE;
/* Drop zero minimum index. */
if (tree_int_cst_equal (genop2, integer_zero_node))
genop2 = NULL_TREE;
else
{
op2expr = get_or_alloc_expr_for (genop2);
genop2 = find_or_generate_expression (block, op2expr, stmts,
domstmt);
if (!genop2)
return NULL_TREE;
}
}
if (genop3)
{
tree elmt_type = TREE_TYPE (TREE_TYPE (genop0));
genop3 = size_binop (EXACT_DIV_EXPR, genop3,
size_int (TYPE_ALIGN_UNIT (elmt_type)));
op3expr = get_or_alloc_expr_for (genop3);
genop3 = find_or_generate_expression (block, op3expr, stmts,
domstmt);
if (!genop3)
return NULL_TREE;
/* We can't always put a size in units of the element alignment
here as the element alignment may be not visible. See
PR43783. Simply drop the element size for constant
sizes. */
if (tree_int_cst_equal (genop3, TYPE_SIZE_UNIT (elmt_type)))
genop3 = NULL_TREE;
else
{
genop3 = size_binop (EXACT_DIV_EXPR, genop3,
size_int (TYPE_ALIGN_UNIT (elmt_type)));
op3expr = get_or_alloc_expr_for (genop3);
genop3 = find_or_generate_expression (block, op3expr, stmts,
domstmt);
if (!genop3)
return NULL_TREE;
}
}
return build4 (currop->opcode, currop->type, genop0, genop1,
genop2, genop3);