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.

llvm-svn: 190542

1 files changed, 7 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/TargetTransformInfo.cpp b/llvm/lib/Analysis/TargetTransformInfo.cpp
index 8c6005b31cb..b23223d56f4 100644
--- a/llvm/lib/Analysis/TargetTransformInfo.cpp
+++ b/llvm/lib/Analysis/TargetTransformInfo.cpp
@@ -96,6 +96,11 @@ bool TargetTransformInfo::isLoweredToCall(const Function *F) const {
   return PrevTTI->isLoweredToCall(F);
 }
 
+void TargetTransformInfo::getUnrollingPreferences(Loop *L,
+                            UnrollingPreferences &UP) const {
+  PrevTTI->getUnrollingPreferences(L, UP);
+}
+
 bool TargetTransformInfo::isLegalAddImmediate(int64_t Imm) const {
   return PrevTTI->isLegalAddImmediate(Imm);
 }
@@ -469,6 +474,8 @@ struct NoTTI : ImmutablePass, TargetTransformInfo {
     return true;
   }
 
+  void getUnrollingPreferences(Loop *, UnrollingPreferences &) const { }
+
   bool isLegalAddImmediate(int64_t Imm) const {
     return false;
   }