Optimize HWrapReceiver

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 7a4893658f340b491b94d1a2e32b78cf05c57f8b..0433a26200c114f4526db988ee8f3a6a83defffc 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -3429,19 +3429,21 @@ void LCodeGen::DoWrapReceiver(LWrapReceiver* instr) {
   // passed unchanged to builtins and strict-mode functions.
   Label global_object, result_in_receiver;
 
-  // Do not transform the receiver to object for strict mode
-  // functions.
-  __ ldr(scratch,
-         FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
-  __ ldr(scratch,
-         FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
-  __ tst(scratch,
-         Operand(1 << (SharedFunctionInfo::kStrictModeFunction + kSmiTagSize)));
-  __ b(ne, &result_in_receiver);
-
-  // Do not transform the receiver to object for builtins.
-  __ tst(scratch, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
-  __ b(ne, &result_in_receiver);
+  if (!instr->hydrogen()->known_function()) {
+    // Do not transform the receiver to object for strict mode
+    // functions.
+    __ ldr(scratch,
+           FieldMemOperand(function, JSFunction::kSharedFunctionInfoOffset));
+    __ ldr(scratch,
+           FieldMemOperand(scratch, SharedFunctionInfo::kCompilerHintsOffset));
+    int mask = 1 << (SharedFunctionInfo::kStrictModeFunction + kSmiTagSize);
+    __ tst(scratch, Operand(mask));
+    __ b(ne, &result_in_receiver);
+
+    // Do not transform the receiver to object for builtins.
+    __ tst(scratch, Operand(1 << (SharedFunctionInfo::kNative + kSmiTagSize)));
+    __ b(ne, &result_in_receiver);
+  }
 
   // Normal function. Replace undefined or null with global receiver.
   __ LoadRoot(scratch, Heap::kNullValueRootIndex);
@@ -3456,8 +3458,8 @@ void LCodeGen::DoWrapReceiver(LWrapReceiver* instr) {
   DeoptimizeIf(eq, instr->environment());
   __ CompareObjectType(receiver, scratch, scratch, FIRST_SPEC_OBJECT_TYPE);
   DeoptimizeIf(lt, instr->environment());
-  __ b(&result_in_receiver);
 
+  __ b(&result_in_receiver);
   __ bind(&global_object);
   __ ldr(result, FieldMemOperand(function, JSFunction::kContextOffset));
   __ ldr(result,