[llvm-commits] [llvm] r57765 - /llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp

[Chris Lattner]

On Oct 17, 2008, at 10:18 PM, Evan Cheng wrote:

> Author: evancheng
> Date: Sat Oct 18 00:18:55 2008
> New Revision: 57765
>
> URL: http://llvm.org/viewvc/llvm-project?rev=57765&view=rev
> Log:
> When creating intervals, leave min(1, numdefs) holes after each  
> instruction.

Just as a sanity check:  extra holes won't affect any of the spill  
cost heuristics, right?

-Chris

>
>
> Modified:
>    llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp
>
> Modified: llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp?rev=57765&r1=57764&r2=57765&view=diff
>
> = 
> = 
> = 
> = 
> = 
> = 
> = 
> = 
> ======================================================================
> --- llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp (original)
> +++ llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp Sat Oct 18  
> 00:18:55 2008
> @@ -130,9 +130,13 @@
>       MIIndex += InstrSlots::NUM;
>       FunctionSize++;
>
> -      // Insert an empty slot after every instruction.
> -      MIIndex += InstrSlots::NUM;
> -      i2miMap_.push_back(0);
> +      // Insert min(1, numdefs) empty slots after every instruction.
> +      unsigned Slots = I->getDesc().getNumDefs();
> +      if (Slots == 0)
> +        Slots = 1;
> +      MIIndex += InstrSlots::NUM * Slots;
> +      while (Slots--)
> +        i2miMap_.push_back(0);
>     }
>
>     // Set the MBB2IdxMap entry for this MBB.
> @@ -732,8 +736,12 @@
>           handleRegisterDef(MBB, MI, MIIndex, MO, i);
>         }
>       }
> -
> -      MIIndex += InstrSlots::NUM;
> +
> +      // Skip over the empty slots after each instruction.
> +      unsigned Slots = MI->getDesc().getNumDefs();
> +      if (Slots == 0)
> +        Slots = 1;
> +      MIIndex += InstrSlots::NUM * Slots;
>
>       // Skip over empty indices.
>       while (MIIndex / InstrSlots::NUM < i2miMap_.size() &&
>
>
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