Subzero: Initial implementation of multithreaded translation.

src/IceDefs.h

Index: src/IceDefs.h
diff --git a/src/IceDefs.h b/src/IceDefs.h
index 66a500fe950f46a312caa41b1a8d84b4fe2dad36..07a851c52e2e626134b8d372b6bea5f9f96f1d3a 100644
--- a/src/IceDefs.h
+++ b/src/IceDefs.h
@@ -65,6 +65,7 @@ class InstTarget;
 class LiveRange;
 class Liveness;
 class Operand;
+class TargetGlobalLowering;
 class TargetLowering;
 class Variable;
 class VariableDeclaration;
@@ -127,6 +128,13 @@ 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 };