[PATCH] D51347: AMDGPU: Force shrinking of add/sub even if the carry is used

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: rampitec.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, jvesely, kzhuravl.

The original motivating example uses a 64-bit add, so the carry
is used. Insert a copy from VCC. This may allow shrinking of
the used carry instruction. At worst, we are replacing a
mov to materialize the constant with a copy of vcc.


https://reviews.llvm.org/D51347

Files:
  lib/Target/AMDGPU/SIFoldOperands.cpp
  test/CodeGen/AMDGPU/fold-immediate-operand-shrink-with-carry.mir

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