[LLVMdev] Adding instruction to mips backend

Daniel Hallmannseder dhallmannseder at hsu-hh.de
Mon Feb 8 05:37:15 PST 2010

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
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