[LLVMdev] how to set -pre-ra-sched from code?
afriedle at indiana.edu
Mon Apr 19 05:27:21 PDT 2010
Sorry for responding to my own message but I would really appreciate
some help with this.
Looking through the documentation again this morning I noticed that
setSchedulingPreference is a protected method of LLVMTargetLowering, so
it looks like it's not something I can call directly anyway.
Furthermore it's only called from one place with a hard-coded value for
any particular platform.
Andrew Friedley wrote:
> Sanjiv Gupta wrote:
>> On Wed, 2010-04-14 at 11:33 -0400, Andrew Friedley wrote:
>>> I've found that I need to set the -pre-RA-sched parameter when using
>>> tools like llc to get the kind of instruction scheduling I want.
>>> However I'm normally generating and running code on the fly using the
>>> JIT, and can't figure out how to set the -pre-RA-sched option anywhere
>>> other than on the command line for the provided tools. So what code
>>> would I write (or where is the API?) to change the pre-regalloc
>>> instruction scheduler algorithm?
>> Does this thing below in TargetLowering help?
>> /// setSchedulingPreference - Specify the target scheduling preference.
>> void setSchedulingPreference(SchedPreference Pref)
> Thanks! That doesn't look like what -pre-RA-sched eventually maps to,
> but it looks like the switch I want to change. Pardon my ignorance, but
> I have no idea how I'm supposed to get to a point where I can call this
> when all I have is a module and an execution engine.
> Better yet, how would I go about figuring this out from the
> documentation? I'm having no luck at all finding these things.
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