[llvm-commits] [llvm] r117174 - in /llvm/trunk: include/llvm/CodeGen/LinkAllCodegenComponents.h include/llvm/CodeGen/Passes.h lib/CodeGen/CMakeLists.txt lib/CodeGen/LiveIntervalUnion.cpp lib/CodeGen/LiveIntervalUnion.h lib/CodeGen/RegAllocBase.h lib/CodeGen/RegAllocBasic.cpp lib/CodeGen/SplitKit.h

[Evan Cheng]

On Oct 26, 2010, at 1:19 PM, Jakob Stoklund Olesen wrote:

> 
> On Oct 26, 2010, at 1:03 PM, Evan Cheng wrote:
> 
>> 3. It would be nice if the new allocators do not have to update LiveStacks but instead compute it after the allocation is done. Do you think it's possible?
> 
> I just moved the responsibility for updating LiveStacks into the spillers.
> 
> The implementation in the standard spiller is a bit too conservative since nobody knows when it spills and when it splits.
> 
> The implementation in InlineSpiller only updates LiveStacks after splitting and rematerialization is complete, so it should provide near minimal LiveStacks.
> 
> If the LiveStacks are minimal, it is fine to calculate them on the fly, right? Or du you have a reason for wanting to compute them after allocation?

No particular reason. LiveStacks is a bit of a hack, I just think we should work towards removing the hack. Not having the allocator updating it is a good start.

Evan

> 
> /jakob
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-commits/attachments/20101026/b6b7068e/attachment.html>