[LLVMdev] MI-Sched temporarily enabled on x86.

[Chandler Carruth]

On Mon, Jun 24, 2013 at 2:41 AM, Andrew Trick <atrick at apple.com> wrote:

> I'm briefly enabling the MachineScheduler pass for x86 tonight to collect
> information on any failures that may show up.
>
> To properly enable the new scheduler, this hook is implemented in
> X86Subtarget:
>
>   bool enableMachineScheduler() const LLVM_OVERRIDE { return true; }
>
> The MachineScheduler pass itself can be enabled/disabled with
> -enable-misched=true/false. But most of the codegen changes result rather
> from moving to source-order SD scheduling and subsequent register
> coalescing decisions. This makes it extremely challenging to keep the unit
> tests functioning during the transition. So you'll see unit test churn when
> I flip the switch.
>

This is really cool. Is there a way to provide a flag to enable the whole
thing so that folks can help you test stuff in advance of making it the
default? (Yes, I'm volunteering. =D)
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