With removing of pinning and with addressors, the pattern matching did not work anymore.
The good thing is that the SIL is now much simpler and we can handle the 2D case without pattern matching at all.
This removes a lot of code from COWArrayOpts.
rdar://problem/43863081
We can’t hoist everything that is hoist-able
The canHoist method does not do all the required analysis
Some of the work is done at COW Array Opt
TODO: Refactor COW Array Opt + canHoist - radar 41601468
Major refactoring + tuning of LICM. Includes:
Support for hosting more array semantic calls
Remove restrictions for sinking instructions
Add support for hoisting and sinking instruction pairs (begin and end accesses)
Testing with Exclusivity enabled on a couple of benchmarks shows:
ReversedArray 7x improvement
StringWalk 2.6x improvement
