Subzero: Initial implementation of multithreaded translation.

src/IceDefs.h

 //===- subzero/src/IceDefs.h - Common Subzero declaraions -------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file declares various useful types and classes that have
@@ skipping 47 matching lines @@
 class FunctionDeclaration;
 class GlobalContext;
 class GlobalDeclaration;
 class Inst;
 class InstAssign;
 class InstPhi;
 class InstTarget;
 class LiveRange;
 class Liveness;
 class Operand;
+class TargetGlobalLowering;
 class TargetLowering;
 class Variable;
 class VariableDeclaration;
 class VariablesMetadata;
 
 template <size_t SlabSize = 1024 * 1024>
 using ArenaAllocator =
     llvm::BumpPtrAllocatorImpl<llvm::MallocAllocator, SlabSize>;
 
 ArenaAllocator<> *getCurrentCfgAllocator();
@@ skipping 42 matching lines @@
 // Inst::Number value, giving the instruction number that begins or
 // ends a variable's live range.
 typedef std::pair<SizeT, InstNumberT> LiveBeginEndMapEntry;
 typedef std::vector<LiveBeginEndMapEntry,
                     CfgLocalAllocator<LiveBeginEndMapEntry>> LiveBeginEndMap;
 typedef llvm::BitVector LivenessBV;
 
 typedef uint32_t TimerStackIdT;
 typedef uint32_t TimerIdT;
 
+// Use alignas(MaxCacheLineSize) to isolate variables/fields that
+// might be contended while multithreading.  Assumes the maximum cache
+// line size is 64.
+enum {
+  MaxCacheLineSize = 64
+};
+
 // PNaCl is ILP32, so theoretically we should only need 32-bit offsets.
 typedef int32_t RelocOffsetT;
 enum { RelocAddrSize = 4 };
 
 enum LivenessMode {
   // Basic version of live-range-end calculation.  Marks the last uses
   // of variables based on dataflow analysis.  Records the set of
   // live-in and live-out variables for each block.  Identifies and
   // deletes dead instructions (primarily stores).
   Liveness_Basic,
@@ skipping 37 matching lines @@
   return llvm::make_range(Container.rbegin(), Container.rend());
 }
 template <typename T>
 llvm::iterator_range<typename T::reverse_iterator> reverse_range(T &Container) {
   return llvm::make_range(Container.rbegin(), Container.rend());
 }
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEDEFS_H