[llvm-dev] BPF tablegen+codegen question

[Chris Sears via llvm-dev]

Also, the constraint language is pretty general (if not very well
documented). Looking at examples,

   grep Constraints */*.td

gives (among about 1200):

  Hexagon/HexagonDepInstrInfo.td:let Constraints = "$Ryy32 = $Ryy32in,
$Rx32 = $Rx32in";
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