Stanislav Mekhanoshin c80d8a8cea [AMDGPU] MachineLICM cannot hoist VALU ...

MachineLoop::isLoopInvariant() returns false for all VALU
because of the exec use. Check TII::isIgnorableUse() to
allow hoisting.

That unfortunately results in higher register consumption
since MachineLICM does not adequately estimate pressure.
Therefor I think it shall only be enabled after D107677 even
though it does not depend on it.

Differential Revision: https://reviews.llvm.org/D107859

2021-10-20 11:47:24 -07:00

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