[llvm-commits] [llvm] r151273 - /llvm/trunk/lib/CodeGen/PostRASchedulerList.cpp

[Jakob Stoklund Olesen]

On Feb 23, 2012, at 11:15 AM, Benjamin Kramer <benny.kra at googlemail.com> wrote:

> Author: d0k
> Date: Thu Feb 23 13:15:40 2012
> New Revision: 151273
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=151273&view=rev
> Log:
> post-ra-sched: Turn the KillIndices vector into a bitvector, it only stored two meaningful states.
> 
> Rename it to LiveRegs to make it more clear what's stored inside.

Very nice. Thanks.

> @@ -466,7 +462,7 @@
>       if (MO.isRegMask())
>         for (unsigned i = 0, e = TRI->getNumRegs(); i != e; ++i)
>           if (MO.clobbersPhysReg(i))
> -            KillIndices[i] = ~0u;
> +            LiveRegs.reset(i);

And now this loop can be vectorized:

  if (MO.isRegMask())
    LiveRegs.clearBitsNotInMask(MO.getRegMask());

The regmask has 1s for preserved registers, and 0s for clobbered registers.

/jakob