Add a new flag -vectorize-slp-aggressive to enable Hals BB vectorizer.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@179507 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 0 deletions

diff --git a/lib/Driver/Tools.cpp b/lib/Driver/Tools.cpp
index 219da03f09..2cb9d6f09e 100644
--- a/lib/Driver/Tools.cpp
+++ b/lib/Driver/Tools.cpp
@@ -3233,6 +3233,13 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
     CmdArgs.push_back("-vectorize-slp");
   }
 
+  // -fno-slp-vectorize-aggressive is default.
+  if (Args.hasFlag(options::OPT_fslp_vectorize_aggressive,
+                   options::OPT_fno_slp_vectorize_aggressive, false)) {
+    CmdArgs.push_back("-backend-option");
+    CmdArgs.push_back("-vectorize-slp-aggressive");
+  }
+
   if (Arg *A = Args.getLastArg(options::OPT_fshow_overloads_EQ))
     A->render(Args, CmdArgs);