MIPS: To aid vector-based load ic work, we need to be able to handle the megamorphic load case in h…

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 9a85eca8102dcb97176932c354a637cf9bc6bb48..978ef7324d540cb773a72e356fbc3ce2b03dbc67 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -30,6 +30,7 @@
 #include "src/base/bits.h"
 #include "src/code-stubs.h"
 #include "src/hydrogen-osr.h"
+#include "src/ic/stub-cache.h"
 #include "src/mips/lithium-codegen-mips.h"
 #include "src/mips/lithium-gap-resolver-mips.h"
 
@@ -3934,6 +3935,34 @@ void LCodeGen::DoInvokeFunction(LInvokeFunction* instr) {
 }
 
 
+void LCodeGen::DoTailCallThroughMegamorphicCache(
+    LTailCallThroughMegamorphicCache* instr) {
+  Register receiver = ToRegister(instr->receiver());
+  Register name = ToRegister(instr->name());
+  DCHECK(receiver.is(LoadDescriptor::ReceiverRegister()));
+  DCHECK(name.is(LoadDescriptor::NameRegister()));
+  DCHECK(receiver.is(a1));
+  DCHECK(name.is(a2));
+
+  Register scratch = a3;
+  Register extra = t0;
+  Register extra2 = t1;
+  Register extra3 = t2;
+
+  // Important for the tail-call.
+  bool must_teardown_frame = NeedsEagerFrame();
+
+  // The probe will tail call to a handler if found.
+  isolate()->stub_cache()->GenerateProbe(masm(), instr->hydrogen()->flags(),
+                                         must_teardown_frame, receiver, name,
+                                         scratch, extra, extra2, extra3);
+
+  // Tail call to miss if we ended up here.
+  if (must_teardown_frame) __ LeaveFrame(StackFrame::INTERNAL);
+  LoadIC::GenerateMiss(masm());
+}
+
+
 void LCodeGen::DoCallWithDescriptor(LCallWithDescriptor* instr) {
   DCHECK(ToRegister(instr->result()).is(v0));