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

[Andrew Trick]

Sriram,

This patch looks good. Please commit.

...and thanks for the data.

-Andy

On Jan 29, 2013, at 12:59 PM, "Murali, Sriram" <sriram.murali at intel.com> 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%.
>  
> Patch by Wan Xiaofei.
>  
> Thanks
> Sriram
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