[llvm-commits] [llvm] r85697 - in /llvm/trunk: lib/Target/ARM/ARMInstrNEON.td test/CodeGen/ARM/fmacs.ll test/CodeGen/ARM/fnmacs.ll test/CodeGen/Thumb2/cross-rc-coalescing-2.ll

[Evan Cheng]

On Nov 1, 2009, at 10:22 AM, Anton Korobeynikov wrote:

> Hello, Evan
>
>> On the other hand, a vmla.32 followed by another vmla.32 is just  
>> fine. And
>> it is faster than vmul + vadd. I agree we should try to solve it  
>> better.
>> Perhaps expanding it before or during schedule2.
> Right, NEON scheduling is tricky, it seems that our instruction
> itineraries are not expressible enough for such complex pipelines.

I think we should be able to handle at least the true dependency  
cases. Instruction latency is a function of both defining instruction  
and the use. cc'ing David for his comments.

Evan

>
> -- 
> With best regards, Anton Korobeynikov
> Faculty of Mathematics and Mechanics, Saint Petersburg State  
> University