llvm dev - Feb 2014 - [LLVMdev] How to set a "SchedBoundary" in pre-RA scheduler

Hi,
 It can use the function of "isSchedBoundary" to set a SchedBoundary
in
misched or post-ra sched. But the function will not use in pre-RA
scheduler, is there some interfaces that I can set a SchedBoundary in
pre-RA scheduler? Thanks in advance.

Best Regards,
Yaorong
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On Feb 19, 2014, at 7:25 AM, Yaorong lee <leeyr338 at gmail.com> wrote:
> Hi, 
>  It can use the function of "isSchedBoundary" to set a
SchedBoundary in misched or post-ra sched. But the function will not use in
pre-RA scheduler, is there some interfaces that I can set a SchedBoundary in
pre-RA scheduler? Thanks in advance.
The pre-RA scheduler doesn’t get to decide the scheduling region. The
SelectionDAGBuilder does this. There are tablegen properties like hasCtrlDep
that might help you. I probably should not suggest this, but as a terrible hack
you could just split the basic block before the SelectionDAG is built
(addPreISel).

-Andy
> 
> Best Regards,
> Yaorong
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