src/hir-instructions.cc

@@ -229,6 +229,12 @@ void HIRPhi::ReplaceArg(HIRInstruction* o, HIRInstruction* n) {
 }
 
 
+void HIRChi::CalculateRepresentation() {
+  assert(args()->length() == 1);
+  representation_ = args()->head()->value()->representation();
+}
+
+
 HIRLiteral::HIRLiteral(AstNode::Type type, ScopeSlot* slot) :
     HIRInstruction(kLiteral),
     type_(type),

src/hir-instructions.h

@@ -50,6 +50,7 @@ typedef ZoneList<HIRPhi*> HIRPhiList;
     V(GetStackTrace) \
     V(AllocateObject) \
     V(AllocateArray) \
+    V(Chi) \
     V(Phi)
 
 #define HIR_INSTRUCTION_ENUM(I) \
@@ -80,6 +81,14 @@ class HIRInstruction : public ZoneObject {
     kHoleRepresentation       = 0x300 // 10000000000
   };
 
+  // If instruction has effect - it needs to be reloaded before it's use,
+  // if reload happened and effect was weak - reset effect
+  enum Effect {
+    kNoEffect,
+    kWeakEffect,
+    kPersistentEffect
+  };
+
   HIRInstruction(Type type);
   HIRInstruction(Type type, ScopeSlot* slot);
 
@@ -145,6 +154,8 @@ class HIRInstruction : public ZoneObject {
   LInstruction* lir_;
   HIRBlock* block_;
 
+  Effect effect_;
+
   bool hashed_;
   uint32_t hash_;
 
@@ -189,6 +200,14 @@ class HIRPhi : public HIRInstruction {
   HIRInstruction* inputs_[2];
 };
 
+class HIRChi : public HIRInstruction {
+ public:
+  HIRChi(ScopeSlot* slot);
+
+  void CalculateRepresentation();
+  HIR_DEFAULT_METHODS(Chi)
+};
+
 class HIRLiteral : public HIRInstruction {
  public:
   HIRLiteral(AstNode::Type type, ScopeSlot* slot);

src/lir.cc

@@ -183,6 +183,13 @@ void LGen::VisitPhi(HIRInstruction* instr) {
   Bind(instr->lir());
 }
 
+
+void LGen::VisitChi(HIRInstruction* instr) {
+  Bind(new LMove())
+      ->AddArg(instr, LUse::kAny)
+      ->SetResult(CreateVirtual(), LUse::kAny);
+}
+
 #undef LGEN_VISIT_SWITCH
 
 void LGen::ComputeLocalLiveSets() {