[PATCH] D21560: Relax the clearance calculating for breaking partial register dependency.

[Dehao Chen via llvm-commits]

It's sandybridge. Each benchmark is repeated 3 times and get the medium.
But by looking at the raw data, the run-to-run variation are pretty large
(2%~5% range across 3 iterations). Thus I would suspect there might be some
noise in the result.

Dehao

On Mon, Jun 27, 2016 at 7:19 PM, Xinliang David Li <davidxl at google.com>
wrote:

> What platform, Ivybridge ?
>
> David
>
> On Mon, Jun 27, 2016 at 6:28 PM, Dehao Chen <danielcdh at gmail.com> wrote:
>
>> danielcdh added a comment.
>>
>> I just tested the perf impact of this patch for SPECCPU INT2006
>> benchmarks:
>>
>> 400.perlbench   2.21%
>> 401.bzip2       -0.46%
>> 403.gcc 1.59%
>> 429.mcf 1.79%
>> 445.gobmk       1.52%
>> 456.hmmer       1.63%
>> 458.sjeng       5.62%
>> 462.libquantum  1.54%
>> 464.h264ref     -1.28%
>> 471.omnetpp     0.00%
>> 473.astar       2.35%
>> 483.xalancbmk   -0.27%
>> overall 1.29%
>>
>> About the -Oz issue, I agree that there should be no xor inserted at -Oz.
>> But that's a different issue and should be fixed in a separate patch.
>>
>>
>> http://reviews.llvm.org/D21560
>>
>>
>>
>>
>
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