llvm dev - Feb 2010 - [LLVMdev] Adding instruction to mips backend

Hi,

I've extended the LLVM IR with a new Instruction. This part works well. 
But I also want to extend the MIPS backend with an associative machine 
instruction, and in this part, I didn't succeed. I read the tutorials, 
but I couldn't realize the code generation for the new LLVM IR 
instruction. Which parts have to be modified ?

Bye,
Daniel

What sorts of errors are you seeing? My first guess would be that you need to
add support for the new instruction to the SelectionDAG machinery (see
lib/CodeGen/SelectionDAG/*).

What instruction are you looking to add?

On Feb 1, 2010, at 3:11 AM, Daniel Hallmannseder wrote:
> Hi,
> 
> I've extended the LLVM IR with a new Instruction. This part works well.
> But I also want to extend the MIPS backend with an associative machine 
> instruction, and in this part, I didn't succeed. I read the tutorials, 
> but I couldn't realize the code generation for the new LLVM IR 
> instruction. Which parts have to be modified ?
> 
> Bye,
> Daniel
> _______________________________________________
> LLVM Developers mailing list
> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev

There are no errors, but the new instruction isn't processed by the 
backend. I have added support to SelectionDAG, but probably not enough. 
The instruction I want to add is a load instruction. I need this new 
load instruction because I want to distinguish it from the already 
available load instruction. This is necessary because of the target 
platform which uses this new load for special purposes. I think the 
addition of the SelectionDAG is insufficient. Is there a detailed 
description, how to insert all necessary information into the 
SelectionDAG part ?

Am 2.2.2010 22:59, schrieb Jim Grosbach:
> What sorts of errors are you seeing? My first guess would be that you need
to add support for the new instruction to the SelectionDAG machinery (see
lib/CodeGen/SelectionDAG/*).
>
> What instruction are you looking to add?
>
> On Feb 1, 2010, at 3:11 AM, Daniel Hallmannseder wrote:
>
>    
>> Hi,
>>
>> I've extended the LLVM IR with a new Instruction. This part works
well.
>> But I also want to extend the MIPS backend with an associative machine
>> instruction, and in this part, I didn't succeed. I read the
tutorials,
>> but I couldn't realize the code generation for the new LLVM IR
>> instruction. Which parts have to be modified ?
>>
>> Bye,
>> Daniel
>> _______________________________________________
>> LLVM Developers mailing list
>> LLVMdev at cs.uiuc.edu         http://llvm.cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev
>>      
>
>
>