[llvm-dev] Instruction selection for 'load' based on static vs. dynamic data

[Dr. ERDI Gergo via llvm-dev]

On Tue, 9 May 2017, Krzysztof Parzyszek wrote:

> On 5/9/2017 8:16 AM, Dr. ERDI Gergo wrote:
>> 
>> Can I also use something more complex than a single machine load 
>> instruction here? I.e. can I write something like
>> 
>> def: Pat<(ld (add (WRAPPER RC:$addr), (sign_extend RC:$offset))),
>>           (load_instruction_rr (special_add RC:$addr, RC:$offset))>;
>> 
>> ? Or do I have to go via some pseudo-instruction for that?
>
> You can have any tree of machine instructions as the output.

Thanks, I managed to get it working using this approach; see
https://github.com/gergoerdi/llvm-avr/commit/bf415da65d102d86596753a541af8804b863928b
if you're interested in the details.