1 files changed, 4 insertions, 0 deletions
diff --git a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
index 08328d9acac..25d563a7d97 100644
--- a/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
+++ b/llvm/lib/Target/PowerPC/PPCTargetTransformInfo.cpp
@@ -187,6 +187,10 @@ void PPCTTIImpl::getUnrollingPreferences(Loop *L,
     // The A2 is in-order with a deep pipeline, and concatenation unrolling
     // helps expose latency-hiding opportunities to the instruction scheduler.
     UP.Partial = UP.Runtime = true;
+
+    // We unroll a lot on the A2 (hundreds of instructions), and the benefits
+    // often outweigh the cost of a division to compute the trip count.
+    UP.AllowExpensiveTripCount = true;
   }
 
   BaseT::getUnrollingPreferences(L, UP);