Re: [avr-llvm-devel] Inline assembly.

[Stepan D. <stp...@na...>]

Hello Borja,
Great. I have found out next inline-asm issue.
When you pass i32 bit type, it could be split onto two registers only, 
no matter which register class you set for it. This behaviour is 
implemented in SelectionDAGBuilder::visitInlineAsm. I think I'll 
implement simplest version of ExpandInlineAsm today, that will fix 
operand types properly.

-Stepan

Borja Ferrer wrote:
> I've been adding fixes to pass a ton of regression in the Generic folder.
> Currently there are two tests that fail with a "cannot select
> build_pair" related to adding 16bit reg classes in the inline asm code.
> The rest of failing tests are related with not being able to run llc
> with -O0. There's a serious codegen bug that i spotted yesterday while
> doing the fixes that I need to work on.
>
>
> 2013/7/22 Borja Ferrer <bor...@gm...
> <mailto:bor...@gm...>>
>
>     Hello Stepan,
>
>     3) Yes, it's the second case. It's explained in
>     http://www.nongnu.org/avr-libc/user-manual/inline_asm.html
>     but in case there are any doubts basically it works the same way as
>     multibyte constraints except that when you see an "aN", where N is a
>     number, you should print the alternative regname. Of course this
>     should only work for X Y and Z, not sure how gcc complains when you
>     use another register, or maybe it ignores it and prints the normal
>     register name.
>
>