[TypeFeedbackVector] Root literal arrays in function literals slots

src/builtins/mips64/builtins-mips64.cc

Index: src/builtins/mips64/builtins-mips64.cc
diff --git a/src/builtins/mips64/builtins-mips64.cc b/src/builtins/mips64/builtins-mips64.cc
index e90801d42072c64d290713868fff0d302d87b87e..bec23d1fa5a1be3c7b50edd816e39bb72fbb7886 100644
--- a/src/builtins/mips64/builtins-mips64.cc
+++ b/src/builtins/mips64/builtins-mips64.cc
@@ -1340,18 +1340,24 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   Register argument_count = a0;
   Register closure = a1;
   Register new_target = a3;
+  Register map = a0;
+  Register index = a2;
+
+  // Do we have a valid feedback vector?
+  __ ld(index, FieldMemOperand(closure, JSFunction::kLiteralsOffset));
+  __ ld(index, FieldMemOperand(index, LiteralsArray::kFeedbackVectorOffset));
+  __ JumpIfRoot(index, Heap::kUndefinedValueRootIndex,
+                &gotta_call_runtime_no_stack);
+
   __ push(argument_count);
   __ push(new_target);
   __ push(closure);
 
-  Register map = a0;
-  Register index = a2;
   __ ld(map, FieldMemOperand(closure, JSFunction::kSharedFunctionInfoOffset));
   __ ld(map, FieldMemOperand(map, SharedFunctionInfo::kOptimizedCodeMapOffset));
   __ ld(index, FieldMemOperand(map, FixedArray::kLengthOffset));
   __ Branch(&gotta_call_runtime, lt, index, Operand(Smi::FromInt(2)));
 
-  // Find literals.
   // a3  : native context
   // a2  : length / index
   // a0  : optimized code map
@@ -1371,20 +1377,6 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
                               SharedFunctionInfo::kOffsetToPreviousContext));
   __ ld(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
   __ Branch(&loop_bottom, ne, temp, Operand(native_context));
-  // Literals available?
-  __ ld(temp, FieldMemOperand(array_pointer,
-                              SharedFunctionInfo::kOffsetToPreviousLiterals));
-  __ ld(temp, FieldMemOperand(temp, WeakCell::kValueOffset));
-  __ JumpIfSmi(temp, &gotta_call_runtime);
-
-  // Save the literals in the closure.
-  __ ld(a4, MemOperand(sp, 0));
-  __ sd(temp, FieldMemOperand(a4, JSFunction::kLiteralsOffset));
-  __ push(index);
-  __ RecordWriteField(a4, JSFunction::kLiteralsOffset, temp, index,
-                      kRAHasNotBeenSaved, kDontSaveFPRegs, EMIT_REMEMBERED_SET,
-                      OMIT_SMI_CHECK);
-  __ pop(index);
 
   // Code available?
   Register entry = a4;
@@ -1394,7 +1386,7 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
   __ ld(entry, FieldMemOperand(entry, WeakCell::kValueOffset));
   __ JumpIfSmi(entry, &try_shared);
 
-  // Found literals and code. Get them into the closure and return.
+  // Found code. Get it into the closure and return.
   __ pop(closure);
   // Store code entry in the closure.
   __ Daddu(entry, entry, Operand(Code::kHeaderSize - kHeapObjectTag));
@@ -1429,7 +1421,7 @@ void Builtins::Generate_CompileLazy(MacroAssembler* masm) {
            Operand(Smi::FromInt(SharedFunctionInfo::kEntryLength)));
   __ Branch(&loop_top, gt, index, Operand(Smi::FromInt(1)));
 
-  // We found neither literals nor code.
+  // We found no code.
   __ jmp(&gotta_call_runtime);
 
   __ bind(&try_shared);