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re PR tree-optimization/50067 (Wrong code with -fpredictive-commoning)

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2011-08-19  Richard Guenther  <rguenther@suse.de>

	PR tree-optimization/50067
	* tree-data-ref.c (dr_analyze_indices): Simplify, strip MEM_REF
	offset only if we accounted for it.

From-SVN: r177903
This commit is contained in:
Richard Guenther 2011-08-19 14:26:13 +00:00 committed by Richard Biener
parent 5dfe80ba71
commit 2946bd342d
2 changed files with 14 additions and 9 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2011-08-19 Richard Guenther <rguenther@suse.de>
PR tree-optimization/50067
* tree-data-ref.c (dr_analyze_indices): Simplify, strip MEM_REF
offset only if we accounted for it.
2011-08-19 Andrew Stubbs <ams@codesourcery.com>
* config/arm/arm.md (maddhidi4): Remove '*' from name.

17
gcc/tree-data-ref.c
View File

@ -863,17 +863,20 @@ dr_analyze_indices (struct data_reference *dr, loop_p nest, loop_p loop)
}
if (nest
&& (INDIRECT_REF_P (aref)
|| TREE_CODE (aref) == MEM_REF))
&& TREE_CODE (aref) == MEM_REF)
{
op = TREE_OPERAND (aref, 0);
access_fn = analyze_scalar_evolution (loop, op);
access_fn = instantiate_scev (before_loop, loop, access_fn);
base = initial_condition (access_fn);
split_constant_offset (base, &base, &off);
if (TREE_CODE (aref) == MEM_REF)
off = size_binop (PLUS_EXPR, off,
fold_convert (ssizetype, TREE_OPERAND (aref, 1)));
if (!integer_zerop (TREE_OPERAND (aref, 1)))
{
off = size_binop (PLUS_EXPR, off,
fold_convert (ssizetype, TREE_OPERAND (aref, 1)));
TREE_OPERAND (aref, 1)
= build_int_cst (TREE_TYPE (TREE_OPERAND (aref, 1)), 0);
}
access_fn = chrec_replace_initial_condition (access_fn,
fold_convert (TREE_TYPE (base), off));
@ -881,10 +884,6 @@ dr_analyze_indices (struct data_reference *dr, loop_p nest, loop_p loop)
VEC_safe_push (tree, heap, access_fns, access_fn);
}
if (TREE_CODE (aref) == MEM_REF)
TREE_OPERAND (aref, 1)
= build_int_cst (TREE_TYPE (TREE_OPERAND (aref, 1)), 0);
if (TREE_CODE (ref) == MEM_REF
&& TREE_CODE (TREE_OPERAND (ref, 0)) == ADDR_EXPR
&& integer_zerop (TREE_OPERAND (ref, 1)))