Revert dynamic frame alignment (r9415)

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
===================================================================
--- src/ia32/lithium-codegen-ia32.cc	(revision 11067)
+++ src/ia32/lithium-codegen-ia32.cc	(working copy)
@@ -79,9 +79,6 @@
   // the frame (that is done in GeneratePrologue).
   FrameScope frame_scope(masm_, StackFrame::MANUAL);
 
-  dynamic_frame_alignment_ = chunk()->num_double_slots() > 2 ||
-                             info()->osr_ast_id() != AstNode::kNoNumber;
-
   return GeneratePrologue() &&
       GenerateBody() &&
       GenerateDeferredCode() &&
@@ -156,29 +153,6 @@
     __ bind(&ok);
   }
 
-  if (dynamic_frame_alignment_) {
-    Label do_not_pad, align_loop;
-    STATIC_ASSERT(kDoubleSize == 2 * kPointerSize);
-    // Align esp to a multiple of 2 * kPointerSize.
-    __ test(esp, Immediate(kPointerSize));
-    __ j(zero, &do_not_pad, Label::kNear);
-    __ push(Immediate(0));
-    __ mov(ebx, esp);
-    // Copy arguments, receiver, and return address.
-    __ mov(ecx, Immediate(scope()->num_parameters() + 2));
-
-    __ bind(&align_loop);
-    __ mov(eax, Operand(ebx, 1 * kPointerSize));
-    __ mov(Operand(ebx, 0), eax);
-    __ add(Operand(ebx), Immediate(kPointerSize));
-    __ dec(ecx);
-    __ j(not_zero, &align_loop, Label::kNear);
-    __ mov(Operand(ebx, 0),
-           Immediate(isolate()->factory()->frame_alignment_marker()));
-
-    __ bind(&do_not_pad);
-  }
-
   __ push(ebp);  // Caller's frame pointer.
   __ mov(ebp, esp);
   __ push(esi);  // Callee's context.
@@ -2125,17 +2099,6 @@
   }
   __ mov(esp, ebp);
   __ pop(ebp);
-  if (dynamic_frame_alignment_) {
-    Label aligned;
-    // Frame alignment marker (padding) is below arguments,
-    // and receiver, so its return-address-relative offset is
-    // (num_arguments + 2) words.
-    __ cmp(Operand(esp, (GetParameterCount() + 2) * kPointerSize),
-           Immediate(factory()->frame_alignment_marker()));
-    __ j(not_equal, &aligned);
-    __ Ret((GetParameterCount() + 2) * kPointerSize, ecx);
-    __ bind(&aligned);
-  }
   __ Ret((GetParameterCount() + 1) * kPointerSize, ecx);
 }