[llvm-commits] [llvm] r159746 - /llvm/trunk/lib/CodeGen/LiveInterval.cpp

[Jakob Stoklund Olesen]

On Jul 5, 2012, at 5:40 AM, Chandler Carruth <chandlerc at gmail.com> wrote:

> Author: chandlerc
> Date: Thu Jul  5 07:40:45 2012
> New Revision: 159746
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=159746&view=rev
> Log:
> Optimize extendIntervalEndTo a tiny bit by saving one call through the
> vector erase. No functionality changed.

This function is very hot when called from LiveInterval::extendInBlock(), and in that case it is known that the new live range doesn't overlap any existing live ranges.

You may be able to squeeze out a bit more performance by inlining a simpler extendIntervalEndTo() into extendInBlock(). The for-loop and std::max conditional are not needed in that case.

/jakob

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