diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index 585e36283f..2909655c0a 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -2029,19 +2029,15 @@ void FullCodeGenerator::VisitAssignment(Assignment* expr) {
     __ push(v0);  // Left operand goes on the stack.
     VisitForAccumulatorValue(expr->value());
 
-    OverwriteMode mode = expr->value()->ResultOverwriteAllowed()
-        ? OVERWRITE_RIGHT
-        : NO_OVERWRITE;
     SetSourcePosition(expr->position() + 1);
     AccumulatorValueContext context(this);
     if (ShouldInlineSmiCase(op)) {
       EmitInlineSmiBinaryOp(expr->binary_operation(),
                             op,
-                            mode,
                             expr->target(),
                             expr->value());
     } else {
-      EmitBinaryOp(expr->binary_operation(), op, mode);
+      EmitBinaryOp(expr->binary_operation(), op);
     }
 
     // Deoptimization point in case the binary operation may have side effects.
@@ -2423,7 +2419,6 @@ void FullCodeGenerator::EmitKeyedSuperPropertyLoad(Property* prop) {
 
 void FullCodeGenerator::EmitInlineSmiBinaryOp(BinaryOperation* expr,
                                               Token::Value op,
-                                              OverwriteMode mode,
                                               Expression* left_expr,
                                               Expression* right_expr) {
   Label done, smi_case, stub_call;
@@ -2444,7 +2439,7 @@ void FullCodeGenerator::EmitInlineSmiBinaryOp(BinaryOperation* expr,
   patch_site.EmitJumpIfSmi(scratch1, &smi_case);
 
   __ bind(&stub_call);
-  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op, mode).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op).code();
   CallIC(code, expr->BinaryOperationFeedbackId());
   patch_site.EmitPatchInfo();
   __ jmp(&done);
@@ -2574,12 +2569,10 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
 }
 
 
-void FullCodeGenerator::EmitBinaryOp(BinaryOperation* expr,
-                                     Token::Value op,
-                                     OverwriteMode mode) {
+void FullCodeGenerator::EmitBinaryOp(BinaryOperation* expr, Token::Value op) {
   __ mov(a0, result_register());
   __ pop(a1);
-  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op, mode).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op).code();
   JumpPatchSite patch_site(masm_);    // unbound, signals no inlined smi code.
   CallIC(code, expr->BinaryOperationFeedbackId());
   patch_site.EmitPatchInfo();
@@ -4850,8 +4843,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
   // Record position before stub call.
   SetSourcePosition(expr->position());
 
-  Handle<Code> code =
-      CodeFactory::BinaryOpIC(isolate(), Token::ADD, NO_OVERWRITE).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), Token::ADD).code();
   CallIC(code, expr->CountBinOpFeedbackId());
   patch_site.EmitPatchInfo();
   __ bind(&done);
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 78299aa032..2ecd826124 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -2066,8 +2066,7 @@ void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
   DCHECK(ToRegister(instr->right()).is(a0));
   DCHECK(ToRegister(instr->result()).is(v0));
 
-  Handle<Code> code =
-      CodeFactory::BinaryOpIC(isolate(), instr->op(), NO_OVERWRITE).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), instr->op()).code();
   CallCode(code, RelocInfo::CODE_TARGET, instr);
   // Other arch use a nop here, to signal that there is no inlined
   // patchable code. Mips does not need the nop, since our marker
diff --git a/src/mips64/full-codegen-mips64.cc b/src/mips64/full-codegen-mips64.cc
index eb143f8dee..9f4be7036c 100644
--- a/src/mips64/full-codegen-mips64.cc
+++ b/src/mips64/full-codegen-mips64.cc
@@ -2026,19 +2026,15 @@ void FullCodeGenerator::VisitAssignment(Assignment* expr) {
     __ push(v0);  // Left operand goes on the stack.
     VisitForAccumulatorValue(expr->value());
 
-    OverwriteMode mode = expr->value()->ResultOverwriteAllowed()
-        ? OVERWRITE_RIGHT
-        : NO_OVERWRITE;
     SetSourcePosition(expr->position() + 1);
     AccumulatorValueContext context(this);
     if (ShouldInlineSmiCase(op)) {
       EmitInlineSmiBinaryOp(expr->binary_operation(),
                             op,
-                            mode,
                             expr->target(),
                             expr->value());
     } else {
-      EmitBinaryOp(expr->binary_operation(), op, mode);
+      EmitBinaryOp(expr->binary_operation(), op);
     }
 
     // Deoptimization point in case the binary operation may have side effects.
@@ -2421,7 +2417,6 @@ void FullCodeGenerator::EmitKeyedSuperPropertyLoad(Property* prop) {
 
 void FullCodeGenerator::EmitInlineSmiBinaryOp(BinaryOperation* expr,
                                               Token::Value op,
-                                              OverwriteMode mode,
                                               Expression* left_expr,
                                               Expression* right_expr) {
   Label done, smi_case, stub_call;
@@ -2442,7 +2437,7 @@ void FullCodeGenerator::EmitInlineSmiBinaryOp(BinaryOperation* expr,
   patch_site.EmitJumpIfSmi(scratch1, &smi_case);
 
   __ bind(&stub_call);
-  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op, mode).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op).code();
   CallIC(code, expr->BinaryOperationFeedbackId());
   patch_site.EmitPatchInfo();
   __ jmp(&done);
@@ -2571,12 +2566,10 @@ void FullCodeGenerator::EmitClassDefineProperties(ClassLiteral* lit) {
 }
 
 
-void FullCodeGenerator::EmitBinaryOp(BinaryOperation* expr,
-                                     Token::Value op,
-                                     OverwriteMode mode) {
+void FullCodeGenerator::EmitBinaryOp(BinaryOperation* expr, Token::Value op) {
   __ mov(a0, result_register());
   __ pop(a1);
-  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op, mode).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), op).code();
   JumpPatchSite patch_site(masm_);    // unbound, signals no inlined smi code.
   CallIC(code, expr->BinaryOperationFeedbackId());
   patch_site.EmitPatchInfo();
@@ -4850,8 +4843,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
   // Record position before stub call.
   SetSourcePosition(expr->position());
 
-  Handle<Code> code =
-      CodeFactory::BinaryOpIC(isolate(), Token::ADD, NO_OVERWRITE).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), Token::ADD).code();
   CallIC(code, expr->CountBinOpFeedbackId());
   patch_site.EmitPatchInfo();
   __ bind(&done);
diff --git a/src/mips64/lithium-codegen-mips64.cc b/src/mips64/lithium-codegen-mips64.cc
index 212b704875..22232e002b 100644
--- a/src/mips64/lithium-codegen-mips64.cc
+++ b/src/mips64/lithium-codegen-mips64.cc
@@ -2023,8 +2023,7 @@ void LCodeGen::DoArithmeticT(LArithmeticT* instr) {
   DCHECK(ToRegister(instr->right()).is(a0));
   DCHECK(ToRegister(instr->result()).is(v0));
 
-  Handle<Code> code =
-      CodeFactory::BinaryOpIC(isolate(), instr->op(), NO_OVERWRITE).code();
+  Handle<Code> code = CodeFactory::BinaryOpIC(isolate(), instr->op()).code();
   CallCode(code, RelocInfo::CODE_TARGET, instr);
   // Other arch use a nop here, to signal that there is no inlined
   // patchable code. Mips does not need the nop, since our marker