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[docs] Guide prospective TableGen backend writers. 

Boilerplate is often the hardest part of getting started with these
kinds of things, so throw them a bone.

llvm-svn: 173969
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Sean Silva 2013-01-30 20:39:46 +00:00
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llvm/docs/TableGenFundamentals.rst
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@ -791,6 +791,10 @@ Expressions used by code generator to describe instructions and isel patterns:
TableGen backends
=================
Until we get a step-by-step HowTo for writing TableGen backends, you can at
least grab the boilerplate (build system, new files, etc.) from Clang's
r173931.
TODO: How they work, how to write one. This section should not contain details
about any particular backend, except maybe ``-print-enums`` as an example. This
should highlight the APIs in ``TableGen/Record.h``.