[SystemZ] Enable LoopDataPrefetch pass.

Loop data prefetching has shown some improvements on benchmarks, and is
enabled at -O1 and above.

Review: Ulrich Weigand
llvm-svn: 308024

1 files changed, 4 insertions, 0 deletions

diff --git a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
index 6923fc6fc91..a0c6fa94f8c 100644
--- a/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
+++ b/llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.h
@@ -56,6 +56,10 @@ public:
   unsigned getNumberOfRegisters(bool Vector);
   unsigned getRegisterBitWidth(bool Vector) const;
 
+  unsigned getCacheLineSize() { return 256; }
+  unsigned getPrefetchDistance() { return 2000; }
+  unsigned getMinPrefetchStride() { return 2048; }
+
   bool prefersVectorizedAddressing() { return false; }
   bool supportsEfficientVectorElementLoadStore() { return true; }
   bool enableInterleavedAccessVectorization() { return true; }