Add getUnrollingPreferences to TTI

Allow targets to customize the default behavior of the generic loop unrolling
transformation. This will be used by the PowerPC backend when targeting the A2
core (which is in-order with a deep pipeline), and using more aggressive
defaults is important.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@189565 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 9 insertions, 0 deletions

diff --git a/lib/Analysis/TargetTransformInfo.cpp b/lib/Analysis/TargetTransformInfo.cpp
index 8c6005b31c..b587ff27ea 100644
--- a/lib/Analysis/TargetTransformInfo.cpp
+++ b/lib/Analysis/TargetTransformInfo.cpp
@@ -96,6 +96,11 @@ bool TargetTransformInfo::isLoweredToCall(const Function *F) const {
   return PrevTTI->isLoweredToCall(F);
 }
 
+bool TargetTransformInfo::getUnrollingPreferences(
+                            UnrollingPreferences &UP) const {
+  return PrevTTI->getUnrollingPreferences(UP);
+}
+
 bool TargetTransformInfo::isLegalAddImmediate(int64_t Imm) const {
   return PrevTTI->isLegalAddImmediate(Imm);
 }
@@ -469,6 +474,10 @@ struct NoTTI : ImmutablePass, TargetTransformInfo {
     return true;
   }
 
+  virtual bool getUnrollingPreferences(UnrollingPreferences &) const {
+    return false;
+  }
+
   bool isLegalAddImmediate(int64_t Imm) const {
     return false;
   }