Cache parameters for target machine.

llvm-svn: 1222

llvm/include/llvm/Target/TargetCacheInfo.h

@@ -0,0 +1,67 @@
+// $Id$ -*-c++-*-
+//***************************************************************************
+// File:
+//	MachineCacheInfo.h
+// 
+// Purpose:
+//      Describes properties of the target cache architecture.
+//**************************************************************************/
+
+#ifndef LLVM_TARGET_MACHINECACHEINFO_H
+#define LLVM_TARGET_MACHINECACHEINFO_H
+
+#include "llvm/Target/TargetMachine.h"
+#include "llvm/Support/DataTypes.h"
+#include <vector>
+
+
+//---------------------------------------------------------------------------
+// class MachineCacheInfo 
+// 
+// Purpose:
+//   Describes properties of the target cache architecture.
+//---------------------------------------------------------------------------
+
+class MachineCacheInfo : public NonCopyableV {
+public:
+  const TargetMachine& target;
+  
+protected:
+  unsigned int           numLevels;
+  vector<unsigned short> cacheLineSizes;
+  vector<unsigned int>   cacheSizes;
+  vector<unsigned short> cacheAssoc;
+  
+public:
+  /*ctor*/          MachineCacheInfo    (const TargetMachine& tgt);
+  /*dtor*/ virtual ~MachineCacheInfo    () {}
+  
+  // Default parameters are:
+  //    NumLevels    = 2
+  //    L1: LineSize 16, Cache Size 32KB, Direct-mapped (assoc = 1)
+  //    L2: LineSize 32, Cache Size 1 MB, 4-way associative
+  // NOTE: Cache levels are numbered from 1 as above, not from 0.
+  // 
+  virtual  void     Initialize          (); // subclass to override defaults
+  
+  unsigned int      getNumCacheLevels   () const {
+    return numLevels;
+  }
+  unsigned short    getCacheLineSize    (unsigned level)  const {
+    assert(level <= cacheLineSizes.size() && "Invalid cache level");
+    return cacheLineSizes[level-1];
+  }
+  unsigned int      getCacheSize        (unsigned level)  const {
+    assert(level <= cacheSizes.size() && "Invalid cache level");
+    return cacheSizes[level-1];
+  }
+  unsigned short    getCacheAssoc       (unsigned level)  const {
+    assert(level <= cacheAssoc.size() && "Invalid cache level");
+    return cacheAssoc[level];
+  }
+};
+
+
+//---------------------------------------------------------------------------
+
+#endif