[LLVMdev] Question about TableGen when adding LLVM Backend.
king19880326 at gmail.com
Wed Mar 9 22:15:58 CST 2011
Is this means that TableGen execution is handled in Makefile. Porting
programmer doesn't need to execute TableGen by hand?
2011/3/10 Jakob Stoklund Olesen <stoklund at 2pi.dk>
> On Mar 9, 2011, at 2:13 PM, Lu Mitnick wrote:
> > Hello all,
> > I have some question about usage of TableGen when adding a new LLVM
> Backend. There are three place to use TableGen in basic steps of document
> "Writing an LLVM Compiler
> > Backend":
> > 2. Describe the register set of the target. Use "TableGen" to generate
> code for register definition, register aliases, and register classes from a
> target-specific RegisterInfo.td input file.
> > 3. Describe the instruction set of the target. Use "TableGen" to generate
> code for target-specific instructions from target-specific versions of
> TargetInstrFormats.td andTargetInstrInfo.td.
> > 4. Describe the selection and conversion of the LLVM IR from a Directed
> Acyclic Graph (DAG) representation of instructions to native target-specific
> instructions. Use "TableGen" to generate code that matches patterns and
> selects instructions based on additional information in a target-specific
> version of TargetInstrInfo.td.
> > I have already read the document "TableGen Fundamentals" and write
> correspond .td files in each steps. However I don't know which TableGen
> options should I use in 2, 3 or 4 steps as above. Would anyone mind to tell
> Look at Makefile.rules in the LLVM top-level directory. There is a bunch of
> targets executing $(TableGen).
> You can also run 'make VERBOSE=1' to see the commands used to build the
> existing targets.
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