Add optimization remarks to the loop unroller and vectorizer.

Summary:
This calls emitOptimizationRemark from the loop unroller and vectorizer
at the point where they make a positive transformation. For the
vectorizer, it reports vectorization and interleave factors. For the
loop unroller, it reports all the different supported types of
unrolling.

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D3456

llvm-svn: 207528

1 files changed, 6 insertions, 0 deletions

diff --git a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
index cf210d679d8..586c220162f 100644
--- a/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
+++ b/llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
@@ -1222,6 +1222,12 @@ struct LoopVectorize : public FunctionPass {
     // Mark the loop as already vectorized to avoid vectorizing again.
     Hints.setAlreadyVectorized(L);
 
+    // Report the vectorization decision.
+    F->getContext().emitOptimizationRemark(
+        DEBUG_TYPE, *F, L->getStartLoc(),
+        Twine("vectorized loop (vectorization factor: ") + Twine(VF.Width) +
+            ", unroll factor: " + Twine(UF) + ")");
+
     DEBUG(verifyFunction(*L->getHeader()->getParent()));
     return true;
   }