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Author SHA1 Message Date
Sanjay Patel f9d2b20daf [InstCombine] reassociate logic ops with constants separated by a zext 
This is a partial implementation of a general fold for associative+commutative operators:
(op (cast (op X, C2)), C1) --> (cast (op X, op (C1, C2)))
(op (cast (op X, C2)), C1) --> (op (cast X), op (C1, C2))

There are 7 associative operators and 13 cast types, so this could potentially go a lot further.

Differential Revision: https://reviews.llvm.org/D22421

llvm-svn: 275684
 2016-07-16 15:20:19 +00:00
Sanjay Patel 27fefb2fcf add tests for associative ops blocked by a cast 
These are more generalized versions of the cases added in
r275302 and r275297.

llvm-svn: 275594
 2016-07-15 18:39:02 +00:00