[llvm] r308024 - [SystemZ] Enable LoopDataPrefetch pass.

[Jonas Paulsson via llvm-commits]

Author: jonpa
Date: Fri Jul 14 06:52:38 2017
New Revision: 308024

URL: http://llvm.org/viewvc/llvm-project?rev=308024&view=rev
Log:
[SystemZ]  Enable LoopDataPrefetch pass.

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

Review: Ulrich Weigand

Modified:
    llvm/trunk/lib/Target/SystemZ/SystemZTargetMachine.cpp
    llvm/trunk/lib/Target/SystemZ/SystemZTargetTransformInfo.h

Modified: llvm/trunk/lib/Target/SystemZ/SystemZTargetMachine.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/SystemZ/SystemZTargetMachine.cpp?rev=308024&r1=308023&r2=308024&view=diff
==============================================================================
--- llvm/trunk/lib/Target/SystemZ/SystemZTargetMachine.cpp (original)
+++ llvm/trunk/lib/Target/SystemZ/SystemZTargetMachine.cpp Fri Jul 14 06:52:38 2017
@@ -143,8 +143,10 @@ public:
 } // end anonymous namespace
 
 void SystemZPassConfig::addIRPasses() {
-  if (getOptLevel() != CodeGenOpt::None)
+  if (getOptLevel() != CodeGenOpt::None) {
     addPass(createSystemZTDCPass());
+    addPass(createLoopDataPrefetchPass());
+  }
 
   TargetPassConfig::addIRPasses();
 }

Modified: llvm/trunk/lib/Target/SystemZ/SystemZTargetTransformInfo.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/SystemZ/SystemZTargetTransformInfo.h?rev=308024&r1=308023&r2=308024&view=diff
==============================================================================
--- llvm/trunk/lib/Target/SystemZ/SystemZTargetTransformInfo.h (original)
+++ llvm/trunk/lib/Target/SystemZ/SystemZTargetTransformInfo.h Fri Jul 14 06:52:38 2017
@@ -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; }