[LLVMdev] MI-Sched temporarily enabled on x86.

[Andrew Trick]

On Jun 24, 2013, at 2:55 AM, Andrew Trick <atrick at apple.com> wrote:

> 
> On Jun 24, 2013, at 2:47 AM, Chandler Carruth <chandlerc at google.com> wrote:
> 
>> 
>> 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)
> 
> I'll probably turn it off soon ;)
> 
> If want the same behavior as the target hook you can use these flags:
> 
> -pre-RA-sched=source -join-globalcopies -enable-misched
> 
> Thanks for any testing! Bug reports would be great.

So far so good. I going to leave this on for a while unattended. If anyone has trouble testing, feel free to revert r184705.

-Andy

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