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poly_int: fold_indirect_ref_1

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This patch makes fold_indirect_ref_1 handle polynomial offsets in
a POINTER_PLUS_EXPR.  The specific reason for doing this now is
to handle:

 		  (tree_to_uhwi (part_width) / BITS_PER_UNIT
 		   * TYPE_VECTOR_SUBPARTS (op00type));

when TYPE_VECTOR_SUBPARTS becomes a poly_int.

2018-01-03  Richard Sandiford  <richard.sandiford@linaro.org>
	    Alan Hayward  <alan.hayward@arm.com>
	    David Sherwood  <david.sherwood@arm.com>

gcc/
	* fold-const.c (fold_indirect_ref_1): Handle polynomial offsets
	in a POINTER_PLUS_EXPR.

Co-Authored-By: Alan Hayward <alan.hayward@arm.com>
Co-Authored-By: David Sherwood <david.sherwood@arm.com>

From-SVN: r256146
This commit is contained in:
Richard Sandiford 2018-01-03 07:17:12 +00:00 • committed by Richard Sandiford
parent d8f860ef70
commit fece509bf1
2 changed files with 14 additions and 9 deletions
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7
gcc/ChangeLog
View file

@ -1,3 +1,10 @@
2018-01-03 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>
* fold-const.c (fold_indirect_ref_1): Handle polynomial offsets
in a POINTER_PLUS_EXPR.
2018-01-03 Richard Sandiford <richard.sandiford@linaro.org>
Alan Hayward <alan.hayward@arm.com>
David Sherwood <david.sherwood@arm.com>

16
gcc/fold-const.c
View file

@ -14049,6 +14049,7 @@ fold_indirect_ref_1 (location_t loc, tree type, tree op0)
{
tree sub = op0;
tree subtype;
poly_uint64 const_op01;
STRIP_NOPS (sub);
subtype = TREE_TYPE (sub);
@ -14103,7 +14104,7 @@ fold_indirect_ref_1 (location_t loc, tree type, tree op0)
}
if (TREE_CODE (sub) == POINTER_PLUS_EXPR
&& TREE_CODE (TREE_OPERAND (sub, 1)) == INTEGER_CST)
&& poly_int_tree_p (TREE_OPERAND (sub, 1), &const_op01))
{
tree op00 = TREE_OPERAND (sub, 0);
tree op01 = TREE_OPERAND (sub, 1);
@ -14120,15 +14121,12 @@ fold_indirect_ref_1 (location_t loc, tree type, tree op0)
&& type == TREE_TYPE (op00type))
{
tree part_width = TYPE_SIZE (type);
unsigned HOST_WIDE_INT max_offset
poly_uint64 max_offset
= (tree_to_uhwi (part_width) / BITS_PER_UNIT
* TYPE_VECTOR_SUBPARTS (op00type));
if (tree_int_cst_sign_bit (op01) == 0
&& compare_tree_int (op01, max_offset) == -1)
if (known_lt (const_op01, max_offset))
{
unsigned HOST_WIDE_INT offset = tree_to_uhwi (op01);
unsigned HOST_WIDE_INT indexi = offset * BITS_PER_UNIT;
tree index = bitsize_int (indexi);
tree index = bitsize_int (const_op01 * BITS_PER_UNIT);
return fold_build3_loc (loc,
BIT_FIELD_REF, type, op00,
part_width, index);
@ -14138,8 +14136,8 @@ fold_indirect_ref_1 (location_t loc, tree type, tree op0)
else if (TREE_CODE (op00type) == COMPLEX_TYPE
&& type == TREE_TYPE (op00type))
{
tree size = TYPE_SIZE_UNIT (type);
if (tree_int_cst_equal (size, op01))
if (known_eq (wi::to_poly_offset (TYPE_SIZE_UNIT (type)),
const_op01))
return fold_build1_loc (loc, IMAGPART_EXPR, type, op00);
}
/* ((foo *)&fooarray)[1] => fooarray[1] */