commit c2af82b4b7ac5cb1766ed0a1977fac5765d4492f
author Michael Kuperstein <mkuper@google.com> Wed Feb 22 00:27:34 2017 +0000
committer Michael Kuperstein <mkuper@google.com> Wed Feb 22 00:27:34 2017 +0000
tree 5f92f8ede4a499520c56dccf1637f18970987dd7
parent 01fb2c87b9d888c5e13778fa4a0622ab4767ff47

[LoopUnroll] Enable PGO-based loop peeling by default.

This enables peeling of loops with low dynamic iteration count by default,
when profile information is available.

Differential Revision: https://reviews.llvm.org/D27734

llvm-svn: 295796

llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp

diff --git a/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp b/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
index 934bb3b..95daf3b 100644
--- a/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
@@ -110,7 +110,7 @@
              "aggressively unrolled."));
 
 static cl::opt<bool>
-    UnrollAllowPeeling("unroll-allow-peeling", cl::Hidden,
+    UnrollAllowPeeling("unroll-allow-peeling", cl::init(true), cl::Hidden,
                        cl::desc("Allows loops to be peeled when the dynamic "
                                 "trip count is known to be low."));
 
@@ -155,7 +155,7 @@
   UP.AllowExpensiveTripCount = false;
   UP.Force = false;
   UP.UpperBound = false;
-  UP.AllowPeeling = false;
+  UP.AllowPeeling = true;
 
   // Override with any target specific settings
   TTI.getUnrollingPreferences(L, UP);