[llvm-commits] [llvm] r83122 - in /llvm/trunk: include/llvm/Target/TargetSubtarget.h lib/CodeGen/LLVMTargetMachine.cpp lib/CodeGen/PostRASchedulerList.cpp lib/Target/ARM/ARM.td lib/Target/ARM/ARMSubtarget.cpp lib/Target/ARM/ARMSubtarget.h test/CodeGen/ARM/2009-08-21-PostRAKill.ll test/CodeGen/ARM/2009-08-21-PostRAKill2.ll test/CodeGen/ARM/2009-08-21-PostRAKill3.ll test/CodeGen/ARM/2009-08-21-PostRAKill4.ll test/CodeGen/ARM/2009-09-01-PostRAProlog.ll

David Goodwin david_goodwin at apple.com
Wed Sep 30 08:40:53 PDT 2009

I did add a subtarget hook to control post-ra scheduling. And by  
default it is off except for the one CPU that is ready for it (cortex- 
a8). But there needs to be a way to override the default (in either  
direction), as well as a way to set the default for a particular CPU. - 
mattr satisfies both of those requirements. Can I get the same  
behavior in a different way?

Evan, all CPUs have an itinerary (even if it is an empty itinerary) so  
I don't think that can be used... and we would still need a way to  
override the default.


On Sep 30, 2009, at 12:43 AM, Evan Cheng wrote:

> On Sep 29, 2009, at 10:16 PM, Chris Lattner wrote:
>> On Sep 29, 2009, at 5:10 PM, David Goodwin wrote:
>>> Author: david_goodwin
>>> Date: Tue Sep 29 19:10:16 2009
>>> New Revision: 83122
>>> URL: http://llvm.org/viewvc/llvm-project?rev=83122&view=rev
>>> Log:
>>> Remove -post-RA-schedule flag and add a TargetSubtarget method to
>>> enable post-register-allocation scheduling. By default it is off.
>>> For ARM, enable/disable with -mattr=+/-postrasched. Enable by
>>> default for cortex-a8.
>> Hi David,
>> -mattr should be used for CPU attributes, not for optimization flags.
>> Having a subtarget hook (or even TargetMachine hook) to indicate
>> whether this should default to on or not makes sense to me, but  
>> should
>> it really be controlled via -mattr?
> I think ARM target should run postalloc scheduling when scheduling  
> itinerary is available for the given cpu?
> Evan
>> -Chris
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