llvm dev - Mar 2011 - [LLVMdev] Question about TableGen when adding LLVM Backend.

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
me??

thanks a lot

yi-hong
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20110310/dec7192e/attachment.html>

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 me??
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.

/jakob

Hello Jakob,

Is this means that TableGen execution is handled in Makefile. Porting
programmer doesn't need to execute TableGen by hand?

thanks

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
> me??
>
> 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.
>
> /jakob
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20110310/44221788/attachment.html>