[PATCH] D24415: AMDGPU: Default to using scalar mov to materialize immediate

[Matt Arsenault via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: tstellarAMD.
arsenm added a subscriber: llvm-commits.
Herald added subscribers: nhaehnle, wdng, arsenm.

This is the conservatively correct way because it's easy to
move or replace a scalar immediate. This was incorrect in the case
when the register class wasn't known from the static instruction
definition, but still needed to be an SGPR. The main example of this
is inlineasm has an SGPR constraint.
    
Also start verifying the register classes of inlineasm operands.

https://reviews.llvm.org/D24415

Files:
  lib/Target/AMDGPU/SIInstrInfo.cpp
  lib/Target/AMDGPU/SIInstrInfo.td
  lib/Target/AMDGPU/SIInstructions.td
  test/CodeGen/AMDGPU/inline-constraints.ll
  test/CodeGen/AMDGPU/insert_vector_elt.ll

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