[LLVMdev] how to set -pre-ra-sched from code?
afriedle at indiana.edu
Thu Apr 15 05:57:19 PDT 2010
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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