Port inlining of type checks in call ICs for API functions to x64 and arm (is...

src/x64/macro-assembler-x64.cc

Index: src/x64/macro-assembler-x64.cc
===================================================================
--- src/x64/macro-assembler-x64.cc	(revision 4439)
+++ src/x64/macro-assembler-x64.cc	(working copy)
@@ -2172,6 +2172,7 @@
                                    JSObject* holder,
                                    Register holder_reg,
                                    Register scratch,
+                                   int save_at_depth,
                                    Label* miss) {
   // Make sure there's no overlap between scratch and the other
   // registers.
@@ -2181,8 +2182,12 @@
   // iteration, reg is an alias for object_reg, on later iterations,
   // it is an alias for holder_reg.
   Register reg = object_reg;
-  int depth = 1;
+  int depth = 0;
 
+  if (save_at_depth == depth) {
+    movq(Operand(rsp, kPointerSize), reg);
+  }
+
   // Check the maps in the prototype chain.
   // Traverse the prototype chain from the object and do map checks.
   while (object != holder) {
@@ -2231,6 +2236,10 @@
       Move(reg, Handle<JSObject>(prototype));
     }
 
+    if (save_at_depth == depth) {
+      movq(Operand(rsp, kPointerSize), reg);
+    }
+
     // Go to the next object in the prototype chain.
     object = prototype;
   }
@@ -2240,7 +2249,7 @@
   j(not_equal, miss);
 
   // Log the check depth.
-  LOG(IntEvent("check-maps-depth", depth));
+  LOG(IntEvent("check-maps-depth", depth + 1));
 
   // Perform security check for access to the global object and return
   // the holder register.