X87: [turbofan]: Implement tail calls with more callee than caller parameters.

src/compiler/x87/code-generator-x87.cc

Index: src/compiler/x87/code-generator-x87.cc
diff --git a/src/compiler/x87/code-generator-x87.cc b/src/compiler/x87/code-generator-x87.cc
index c3ff08e6047b7f372d2ed7eaad39296c9dbb2844..f5649766c41f25213bdd2b9528c51eb9cae1d776 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -331,18 +331,23 @@ class OutOfLineRecordWrite final : public OutOfLineCode {
 
 
 void CodeGenerator::AssembleDeconstructActivationRecord(int stack_param_delta) {
+  int sp_slot_delta = TailCallFrameStackSlotDelta(stack_param_delta);
+  if (sp_slot_delta > 0) {
+    __ add(esp, Immediate(sp_slot_delta * kPointerSize));
+  }
   CallDescriptor* descriptor = linkage()->GetIncomingDescriptor();
-  int stack_slots = frame()->GetSpillSlotCount();
-  if (descriptor->IsJSFunctionCall() || stack_slots > 0) {
-    __ mov(esp, ebp);
+  int spill_slots = frame()->GetSpillSlotCount();
+  bool has_frame = descriptor->IsJSFunctionCall() || spill_slots > 0;
+  if (has_frame) {
     __ pop(ebp);
   }
-  if (stack_param_delta < 0) {
-    int offset = -(stack_param_delta + 1) * kPointerSize;
-    __ pop(Operand(esp, offset));
-    if (offset != 0) {
-      __ add(esp, Immediate(offset));
-    }
+}
+
+
+void CodeGenerator::AssemblePrepareTailCall(int stack_param_delta) {
+  int sp_slot_delta = TailCallFrameStackSlotDelta(stack_param_delta);
+  if (sp_slot_delta < 0) {
+    __ sub(esp, Immediate(-sp_slot_delta * kPointerSize));
   }
 }
 
@@ -438,6 +443,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
       __ PrepareCallCFunction(num_parameters, i.TempRegister(0));
       break;
     }
+    case kArchPrepareTailCall:
+      AssemblePrepareTailCall(i.InputInt32(instr->InputCount() - 1));
+      break;
     case kArchCallCFunction: {
       int const num_parameters = MiscField::decode(instr->opcode());
       if (HasImmediateInput(instr, 0)) {