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fold-const.c (fold_binary_loc): Move (T)ptr & CST folding... 

2015-07-03  Richard Biener  <rguenther@suse.de>

	* fold-const.c (fold_binary_loc): Move (T)ptr & CST folding...
	* match.pd: ... here.

From-SVN: r225368
This commit is contained in:
Richard Biener 2015-07-03 07:55:10 +00:00 committed by Richard Biener
parent bfdb257aa3
commit bab73f11b8
3 changed files with 20 additions and 19 deletions
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5
gcc/ChangeLog
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@ -1,3 +1,8 @@
2015-07-03 Richard Biener <rguenther@suse.de>
* fold-const.c (fold_binary_loc): Move (T)ptr & CST folding...
* match.pd: ... here.
2015-07-03 Gerald Pfeifer <gerald@pfeifer.com>
PR target/37072

19
gcc/fold-const.c
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@ -11069,25 +11069,6 @@ fold_binary_loc (location_t loc,
fold_convert_loc (loc, type, TREE_OPERAND (arg0, 0));
}
/* If arg0 is derived from the address of an object or function, we may
be able to fold this expression using the object or function's
alignment. */
if (POINTER_TYPE_P (TREE_TYPE (arg0)) && TREE_CODE (arg1) == INTEGER_CST)
{
unsigned int align;
unsigned HOST_WIDE_INT bitpos;
get_pointer_alignment_1 (arg0, &align, &bitpos);
/* This works because modulus is a power of 2. If this weren't the
case, we'd have to replace it by its greatest power-of-2
divisor: modulus & -modulus. */
if (wi::ltu_p (arg1, align / BITS_PER_UNIT))
return wide_int_to_tree (type,
wi::bit_and (arg1,
bitpos / BITS_PER_UNIT));
}
goto associate;
case RDIV_EXPR:

15
gcc/match.pd
View File

@ -668,6 +668,21 @@ along with GCC; see the file COPYING3. If not see
(if (ptr_difference_const (@0, @1, &diff))
{ build_int_cst_type (type, diff); }))))
/* If arg0 is derived from the address of an object or function, we may
be able to fold this expression using the object or function's
alignment. */
(simplify
(bit_and (convert? @0) INTEGER_CST@1)
(if (POINTER_TYPE_P (TREE_TYPE (@0))
&& tree_nop_conversion_p (type, TREE_TYPE (@0)))
(with
{
unsigned int align;
unsigned HOST_WIDE_INT bitpos;
get_pointer_alignment_1 (@0, &align, &bitpos);
}
(if (wi::ltu_p (@1, align / BITS_PER_UNIT))
{ wide_int_to_tree (type, wi::bit_and (@1, bitpos / BITS_PER_UNIT)); }))))
/* We can't reassociate at all for saturating types. */