[llvm-commits] [llvm] r108735 - in /llvm/trunk: include/llvm/Target/TargetLowering.h lib/CodeGen/SelectionDAG/TargetLowering.cpp

[Jakob Stoklund Olesen]

On Jul 19, 2010, at 11:47 AM, Evan Cheng wrote:

> Author: evancheng
> Date: Mon Jul 19 13:47:01 2010
> New Revision: 108735
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=108735&view=rev
> Log:
> Teach computeRegisterProperties() to compute "representative" register class for legal value types. A "representative" register class is the largest legal super-reg register class for a value type. e.g. On i386, GR32 is the rep register class for i8 / i16 / i32; on x86_64 it would be GR64.
> 
> This property will be used by the register pressure tracking instruction scheduler.

Hi Evan,

This looks a lot like you have x86 in mind.

What is getRepRegClassFor(f32) going to return on ARM? QQQQ?

How are you planning to deal with registers with more than one usable subregister?

/jakob