[TTI] Add getCacheLineSize

Summary:
And use it in PPCLoopDataPrefetch.cpp.

@hfinkel, please let me know if your preference would be to preserve the
ppc-loop-prefetch-cache-line option in order to be able to override the
value of TTI::getCacheLineSize for PPC.

Reviewers: hfinkel

Subscribers: hulx2000, mcrosier, mssimpso, hfinkel, llvm-commits

Differential Revision: http://reviews.llvm.org/D16306

llvm-svn: 258419

1 files changed, 3 insertions, 5 deletions

diff --git a/llvm/lib/Target/PowerPC/PPCLoopDataPrefetch.cpp b/llvm/lib/Target/PowerPC/PPCLoopDataPrefetch.cpp
index e3a35d5df35..c113ae5f52c 100644
--- a/llvm/lib/Target/PowerPC/PPCLoopDataPrefetch.cpp
+++ b/llvm/lib/Target/PowerPC/PPCLoopDataPrefetch.cpp
@@ -50,10 +50,6 @@ static cl::opt<unsigned>
 PrefDist("ppc-loop-prefetch-distance", cl::Hidden, cl::init(300),
          cl::desc("The loop prefetch distance"));
 
-static cl::opt<unsigned>
-CacheLineSize("ppc-loop-prefetch-cache-line", cl::Hidden, cl::init(64),
-              cl::desc("The loop prefetch cache line size"));
-
 namespace llvm {
   void initializePPCLoopDataPrefetchPass(PassRegistry&);
 }
@@ -110,6 +106,8 @@ bool PPCLoopDataPrefetch::runOnFunction(Function &F) {
   AC = &getAnalysis<AssumptionCacheTracker>().getAssumptionCache(F);
   TTI = &getAnalysis<TargetTransformInfoWrapperPass>().getTTI(F);
 
+  assert(TTI->getCacheLineSize() && "Cache line size is not set for target");
+
   bool MadeChange = false;
 
   for (auto I = LI->begin(), IE = LI->end(); I != IE; ++I)
@@ -193,7 +191,7 @@ bool PPCLoopDataPrefetch::runOnLoop(Loop *L) {
         if (const SCEVConstant *ConstPtrDiff =
             dyn_cast<SCEVConstant>(PtrDiff)) {
           int64_t PD = std::abs(ConstPtrDiff->getValue()->getSExtValue());
-          if (PD < (int64_t) CacheLineSize) {
+          if (PD < (int64_t) TTI->getCacheLineSize()) {
             DupPref = true;
             break;
           }