PPC: Remove receiver conversion from function prologue

src/full-codegen/ppc/full-codegen-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/debug/debug.h"
@@ skipping 95 matching lines @@
 
   ProfileEntryHookStub::MaybeCallEntryHook(masm_);
 
 #ifdef DEBUG
   if (strlen(FLAG_stop_at) > 0 &&
       info->literal()->name()->IsUtf8EqualTo(CStrVector(FLAG_stop_at))) {
     __ stop("stop-at");
   }
 #endif
 
-  // Sloppy mode functions and builtins need to replace the receiver with the
-  // global proxy when called as functions (without an explicit receiver
-  // object).
-  if (info->MustReplaceUndefinedReceiverWithGlobalProxy()) {
-    Label ok;
+  if (FLAG_debug_code && info->ExpectsJSReceiverAsReceiver()) {
     int receiver_offset = info->scope()->num_parameters() * kPointerSize;
     __ LoadP(r5, MemOperand(sp, receiver_offset), r0);
-    __ CompareRoot(r5, Heap::kUndefinedValueRootIndex);
-    __ bne(&ok);
-
-    __ LoadP(r5, GlobalObjectOperand());
-    __ LoadP(r5, FieldMemOperand(r5, JSGlobalObject::kGlobalProxyOffset));
-
-    __ StoreP(r5, MemOperand(sp, receiver_offset), r0);
-
-    __ bind(&ok);
+    __ AssertNotSmi(r5);
+    __ CompareObjectType(r5, r5, no_reg, FIRST_SPEC_OBJECT_TYPE);
+    __ Assert(ge, kSloppyFunctionExpectsJSReceiverReceiver);
   }
 
   // Open a frame scope to indicate that there is a frame on the stack.  The
   // MANUAL indicates that the scope shouldn't actually generate code to set up
   // the frame (that is done below).
   FrameScope frame_scope(masm_, StackFrame::MANUAL);
   int prologue_offset = masm_->pc_offset();
 
   if (prologue_offset) {
     // Prologue logic requires it's starting address in ip and the
@@ skipping 4907 matching lines @@
     return ON_STACK_REPLACEMENT;
   }
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 }  // namespace internal
 }  // namespace v8
 #endif  // V8_TARGET_ARCH_PPC