[llvm-commits] [llvm] r83207 - /llvm/trunk/lib/CodeGen/AsmPrinter/DwarfDebug.cpp

Devang Patel dpatel at apple.com
Thu Oct 1 14:25:37 PDT 2009

On Oct 1, 2009, at 1:38 PM, Dan Gohman wrote:

> On Oct 1, 2009, at 11:25 AM, Devang Patel wrote:
>> Author: dpatel
>> Date: Thu Oct  1 13:25:23 2009
>> New Revision: 83207
>> URL: http://llvm.org/viewvc/llvm-project?rev=83207&view=rev
>> Log:
>> Record first and last instruction of a scope in DbgScope.
> How does this interact with Post-RA scheduling, MachineLICM, and  
> MachineHoist?

It depends on when we run this DwarfDebug pass. Today, at iSel time we  
put the stake in the ground and emit label node (or instruction) to  
mark scope boundaries. In future,  this will be divided into three steps

1 - Just before AsmPrinter, the DwarfDebug will note down scope  
boundaries in DbgScope based on info attached with an machine  
2 - @processDebugLoc() in AsmPrinter the labels will be emitted to  
mark scope boundaries and DW will be updated according.
3 - At the end, the scope DIEs will be created based on DbgScope  

So MachineLICM will have as much freedom as standard LICM.

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