[LLVMdev] Need Advice on AVX

[David Greene]

On Thursday 26 November 2009 14:25, Chris Lattner wrote:

> > Modeling subregisters isn't hard.  Do you have some guidance as to when
> > one method is preferable?  I am leaning toward using the modifier since
> > conceptually, a vector_extract of element zero on a v4i64 makes sense
> > with AVX (so it is "legal").  You just have to emit the register name as
> > "xmm" rather than "ymm."  Why write an additional complicated pattern for
> > this case?
>
> Please don't use asmprinter modifiers.  I'm trying to remove them as part
> of the MCization code.  Please use the SUBREG machine instr and (subreg)
> tblgen node as appropriate.

Ok.

                            -Dave