diff options
| author | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-11-10 11:47:53 +0000 |
|---|---|---|
| committer | rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-11-10 11:47:53 +0000 |
| commit | e407654009147ad3a1637818b62deb2e5026ef94 (patch) | |
| tree | 9621814c43521e40189c352f06dcc0e2f29e1311 /gcc/match.pd | |
| parent | c8f6378fad7663b3af501ffbafabec417e368b92 (diff) | |
| download | gcc-e407654009147ad3a1637818b62deb2e5026ef94.tar.gz | |
2014-11-10 Richard Biener <rguenther@suse.de>
* match.pd: Implement pattern from simplify_conversion_from_bitmask.
* tree-ssa-forwprop.c (simplify_conversion_from_bitmask): Remove.
(pass_forwprop::execute): Do not call simplify_conversion_from_bitmask.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@217284 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/match.pd')
| -rw-r--r-- | gcc/match.pd | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/gcc/match.pd b/gcc/match.pd index 04c657608bb..c88beb94b75 100644 --- a/gcc/match.pd +++ b/gcc/match.pd @@ -431,3 +431,15 @@ along with GCC; see the file COPYING3. If not see (unsigned) significand_size (TYPE_MODE (inter_type)) >= inside_prec - !inside_unsignedp) (convert @0)))))) + +/* If we have a narrowing conversion to an integral type that is fed by a + BIT_AND_EXPR, we might be able to remove the BIT_AND_EXPR if it merely + masks off bits outside the final type (and nothing else). */ +(simplify + (convert (bit_and @0 INTEGER_CST@1)) + (if (INTEGRAL_TYPE_P (type) + && INTEGRAL_TYPE_P (TREE_TYPE (@0)) + && TYPE_PRECISION (type) <= TYPE_PRECISION (TREE_TYPE (@0)) + && operand_equal_p (@1, build_low_bits_mask (TREE_TYPE (@1), + TYPE_PRECISION (type)), 0)) + (convert @0))) |