llvm dev - Jul 2013 - [LLVMdev] MachineBasicBlocks Cloning

Hi,

For some schedulers like Trace Scheduling it is necessary to clone basic blocks.
Instinctively I would think the "Machine Instruction Scheduler" would
be the right place to do so.

Is it possible to clone MachineBasicBlocks in the "Machine Instruction
Scheduler" pass? Any snares? Or is it to much effort to implement it there
and there is a better place for such things?

Thank you,
Nico

Cloning a basic block should be a utility function that can be called from any
machine pass.

That being said, it should only be responsible for cloning the basic block and
not updating any analysis passes that were run on the basic block. Those should
have to be rerun separately.

Micah
> -----Original Message-----
> From: llvmdev-bounces at cs.uiuc.edu [mailto:llvmdev-bounces at
cs.uiuc.edu]
> On Behalf Of Nico
> Sent: Wednesday, July 31, 2013 5:16 AM
> To: LLVM Developers Mailing List
> Subject: [LLVMdev] MachineBasicBlocks Cloning
> 
> Hi,
> 
> For some schedulers like Trace Scheduling it is necessary to clone basic
> blocks.
> Instinctively I would think the "Machine Instruction Scheduler"
would be the
> right place to do so.
> 
> Is it possible to clone MachineBasicBlocks in the "Machine Instruction
> Scheduler" pass? Any snares? Or is it to much effort to implement it
there
> and there is a better place for such things?
> 
> Thank you,
> Nico
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