[LLVMdev] [Patch][Review Requested][Compilation Time] Avoid frequent copy of elements in LoopStrengthReduce

[John Criswell]

On 1/29/13 2:59 PM, Murali, Sriram wrote:
>
> Hello,
>
> This patch aims to improve compile time performance by increasing the 
> SCEV vector size in LoopStrengthReduce. It is observed that the 
> BaseRegs vector size is 4 in most cases, and elements are frequently 
> copied when it is initialized as SmallVector<const SCEV *, 2> BaseRegs.
>
> Our benchmark results show that the compilation time performance 
> improved by ~0.5%.
>

Just an FYI that I think patches are supposed to be sent to llvm-commits.

-- John T.

> Patch by Wan Xiaofei.
>
> Thanks
>
> Sriram
>
>
>
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