[llvm] r189858 - Enable late-vectorization by default.

[Chandler Carruth]

Awesome. I should have nbers in a couple of days. Any interesting change to
binary size that you've seen?
On Sep 3, 2013 2:37 PM, "Nadav Rotem" <nrotem at apple.com> wrote:

> Author: nadav
> Date: Tue Sep  3 16:33:17 2013
> New Revision: 189858
>
> URL: http://llvm.org/viewvc/llvm-project?rev=189858&view=rev
> Log:
> Enable late-vectorization by default.
> This patch changes the default setting for the LateVectorization flag that
> controls where the loop-vectorizer is ran.
>
> Perf gains:
> SingleSource/Benchmarks/Shootout/matrix -37.33%
> MultiSource/Benchmarks/PAQ8p/paq8p  -22.83%
> SingleSource/Benchmarks/Linpack/linpack-pc  -16.22%
> SingleSource/Benchmarks/Shootout-C++/ary3 -15.16%
> MultiSource/Benchmarks/TSVC/NodeSplitting-flt/NodeSplitting-flt -10.34%
> MultiSource/Benchmarks/TSVC/NodeSplitting-dbl/NodeSplitting-dbl -7.12%
>
> Regressions:
> SingleSource/Benchmarks/Misc/lowercase  15.10%
> MultiSource/Benchmarks/TSVC/Equivalencing-flt/Equivalencing-flt 13.18%
> SingleSource/Benchmarks/Shootout-C++/matrix 8.27%
> SingleSource/Benchmarks/CoyoteBench/lpbench 7.30%
>
>
> Modified:
>     llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp
>
> Modified: llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp
> URL:
> http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp?rev=189858&r1=189857&r2=189858&view=diff
>
> ==============================================================================
> --- llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp (original)
> +++ llvm/trunk/lib/Transforms/IPO/PassManagerBuilder.cpp Tue Sep  3
> 16:33:17 2013
> @@ -33,7 +33,7 @@ RunLoopVectorization("vectorize-loops",
>                       cl::desc("Run the Loop vectorization passes"));
>
>  static cl::opt<bool>
> -LateVectorization("late-vectorize", cl::init(false), cl::Hidden,
> +LateVectorization("late-vectorize", cl::init(true), cl::Hidden,
>                    cl::desc("Run the vectorization pasess late in the pass
> "
>                             "pipeline (after the inliner)"));
>
>
>
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