[PATCH] [MachineSink+PGO] Teach MachineSink to use BlockFrequencyInfo

[Manman Ren]

On Mon, Sep 22, 2014 at 12:59 PM, Bruno Cardoso Lopes <
bruno.cardoso at gmail.com> wrote:

> Hi qcolombet, chandlerc, ributzka,
>
> Teach MachineSink to use BlockFrequencyInfo
>
> Machine Sink uses loop depth information to select between successors BBs
> to sink machine instructions into, where BBs within smaller loop depths are
> preferable.
> This patch adds support for choosing between successors by using profile
> information from BlockFrequencyInfo instead, whenever the information is
> available.
>
> Tested it under SPEC2006 train (average of 30 runs for each program).


The numbers look good! Are they collected with training on train data and
running on actual data?

Thanks,
Manman


> The baseline uses -O3 and PGO without Machine Sink support. There are no
> regressions found for these programas, and the speedup follows:
>
> benchmark       Speedup (Relative change)
> 400.perlbench   2.49%
> 401.bzip2       2.59%
> 403.gcc         2.43%
> 429.mcf         2.56%
> 456.hmmer       2.38%
> 458.sjeng       1.75%
> 462.libquantum  0.08%
> 464.h264ref     2.65%
> 471.omnetpp     1.00%
> 473.astar       1.81%
> 483.xalancbmk   1.00%
> 433.milc        1.44%
> 444.namd        1.60%
> 450.soplex      1.63%
> 470.lbm         1.65%
> GeoMean         1.49%
>
> More details on the results at http://pastebin.com/VQBfU4PH
>
> http://reviews.llvm.org/D5447
>
> Files:
>   lib/CodeGen/MachineSink.cpp
>
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