[PATCH] D36084: [globalisel][tablegen] Support zero-instruction emission.

[Daniel Sanders via Phabricator via llvm-commits]

dsanders created this revision.
Herald added subscribers: igorb, kristof.beyls.

Support the case where an operand of a pattern is also the whole of the
result pattern. In this case the original result and all its uses must be
replaced by the operand. However, register class restrictions can require
a COPY. This patch handles both cases by always emitting the copy and
leaving it for the register allocator to optimize.

Depends on https://reviews.llvm.org/D35833


https://reviews.llvm.org/D36084

Files:
  utils/TableGen/GlobalISelEmitter.cpp

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