[PATCH] D141030: [WIP][AMDGPU] Legalize soffset of buffer instruction. Use Waterfall loop logic.

[krishna chaitanya sankisa via Phabricator via llvm-commits]

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Legalize soffset of buffer instructions. If vgpr is assigned to soffset, use waterfall loop logic to legalize.

Waterfall loop is implemented in three steps:
Prologue: This step figures out the active lanes and lanes that have same values so that they can run simultaneously.
Payload: This is the actual work that needs to be done by the those lanes figured out in the previous step.
Epilogue: Set the exec with remaining lanes, previously executed lanes are masked out. If the exec is not zero, proceed to execute the remaining lanes


https://reviews.llvm.org/D141030

Files:
  llvm/lib/Target/AMDGPU/SIInstrInfo.cpp
  llvm/test/CodeGen/AMDGPU/legalize-soffset-mbuf.ll

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