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Author SHA1 Message Date
Mirko Brkusanin a75d6178b8 [GlobalISel] Add combine for (x | mask) -> x when (x | mask) == x 
If we have a mask, and a value x, where (x | mask) == x, we can drop the OR
and just use x.

Differential Revision: https://reviews.llvm.org/D90952
 2020-11-10 11:32:13 +01:00
Mirko Brkusanin fb36ab0a42 [GlobalISel] Expand combine for (x & mask) -> x when (x & mask) == x 
We can use KnownBitsAnalysis to cover cases when mask is not trivial. It can
also help with cases when mask is not constant but can still be folded into
one. Since 'and' is comutative we should treat both operands as possible
replacements.

Differential Revision: https://reviews.llvm.org/D90674
 2020-11-10 11:32:13 +01:00
Mirko Brkusanin 53ae95c946 [AMDGPU][GlobalISel] Combine shift + logic + shift with constant operands 
This sequence of instructions can be simplified if they are single use and
some operands are constants. Additional combines may be applied afterwards.

Differential Revision: https://reviews.llvm.org/D90223
 2020-11-10 11:32:13 +01:00