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match.pd (x | 0 -> x): Add.

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2016-08-19  Richard Biener  <rguenther@suse.de>

	* match.pd (x | 0 -> x): Add.

From-SVN: r239606
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Richard Biener 2016-08-19 07:03:48 +00:00 committed by Richard Biener
parent 1a5da5b66a
commit ca0b7ecec7
2 changed files with 13 additions and 4 deletions
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2016-08-19 Richard Biener <rguenther@suse.de>
* match.pd (x | 0 -> x): Add.
2016-08-19 Richard Biener <rguenther@suse.de> 2016-08-19 Richard Biener <rguenther@suse.de>
PR tree-optimization/77286 PR tree-optimization/77286

13
gcc/match.pd
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@ -541,13 +541,18 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
/* x | ~0 -> ~0 */ /* x | ~0 -> ~0 */
(simplify (simplify
(bit_ior @0 integer_all_onesp@1) (bit_ior @0 integer_all_onesp@1)
@1) @1)
/* x | 0 -> x */
(simplify
(bit_ior @0 integer_zerop)
@0)
/* x & 0 -> 0 */ /* x & 0 -> 0 */
(simplify (simplify
(bit_and @0 integer_zerop@1) (bit_and @0 integer_zerop@1)
@1) @1)
/* ~x | x -> -1 */ /* ~x | x -> -1 */
/* ~x ^ x -> -1 */ /* ~x ^ x -> -1 */