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# dccf83ac 18-Mar-2021 alex-t <[email protected]>

[AMDGPU] SIOptimizeExecMaskingPreRA should check constant bus constraint when folds EXEC copy

Folding EXEC copy into it's single use may lead to constant bus constraint violation as it adds one more

[AMDGPU] SIOptimizeExecMaskingPreRA should check constant bus constraint when folds EXEC copy

Folding EXEC copy into it's single use may lead to constant bus constraint violation as it adds one more SGPR operand.
This change makes it validate the user instruction with the new SGPR operand and only fold it if it is legal.

Reviewed By: rampitec, arsenm

Differential Revision: https://reviews.llvm.org/D98888

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