Re: [avr-llvm-devel] Inline assembly. Mostly just a stub.

[Borja F. <bor...@gm...>]

Ok I understand it now. I will check what other backends do, but what you
proposed seems reasonable.

What happens in your example above when you use a real instruction like for
example LDD? Does it still use GPR8 regs? To me it's weird that if you use
a real instruction where operands are clearly defined in the td file the
instruction selector uses  an invalid regclass.


2013/6/22 Stepan Dyatkovskiy <stp...@na...>

> So I suppose, I need analyze Op in SelectInlineAsmMemoryOperand,
> then create virtual reg of PTRDISPREGS class and use it.
>
> -Stepan.
>
> Stepan Dyatkovskiy wrote:
>
>> Hi Borja,
>>
>> Borja Ferrer wrote:
>>
>>> Resending the email to the list without any previous emails:
>>>
>>> Hello Stepan,
>>>
>>> 1) This should be fixed now with my last commit.
>>> 2) I dont really understand what you mean. Can you expand a bit more
>>> here?
>>>
>>
>> Currently for line:
>>
>> call void asm "some_instr $0", "=*Q"(i16* @b)
>>
>> It does emit:
>>
>>       ldi    r24, lo8(b)
>>       ldi    r25, hi8(b)
>>       ;APP
>>       some_instr [r24]
>>
>> While it shuold emit Y+q instead of r24 e.g.:
>>
>>       ldi   YL , lo8(b)
>>       ldi   YH , hi8(b)
>>       ;APP
>>       some_instr Y+1
>>
>> -Stepan
>>
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>