[llvm] r252733 - [SLP] Enable -slp-vectorize-hor by default.

[Charlie Turner via llvm-commits]

Author: chatur01
Date: Wed Nov 11 09:03:46 2015
New Revision: 252733

URL: http://llvm.org/viewvc/llvm-project?rev=252733&view=rev
Log:
[SLP] Enable -slp-vectorize-hor by default.

Measurements primarily on AArch64 have shown this feature does not
significantly effect compile-time. The are no significant perf changes in LNT,
but for AArch64 at least, there are wins in third party benchmarks.

As discussed on llvm-dev, we're going to try turning this on by default and see
how other targets react to the change.

Modified:
    llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp

Modified: llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp?rev=252733&r1=252732&r2=252733&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp (original)
+++ llvm/trunk/lib/Transforms/Vectorize/SLPVectorizer.cpp Wed Nov 11 09:03:46 2015
@@ -61,7 +61,7 @@ static cl::opt<int>
                               "number "));
 
 static cl::opt<bool>
-ShouldVectorizeHor("slp-vectorize-hor", cl::init(false), cl::Hidden,
+ShouldVectorizeHor("slp-vectorize-hor", cl::init(true), cl::Hidden,
                    cl::desc("Attempt to vectorize horizontal reductions"));
 
 static cl::opt<bool> ShouldStartVectorizeHorAtStore(