Experimental: thread live register references to deferred code....

src/macro-assembler-ia32.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 585 matching lines @@
                      Context::SECURITY_TOKEN_INDEX * kPointerSize;
   mov(scratch, FieldOperand(scratch, token_offset));
   cmp(scratch, FieldOperand(holder_reg, token_offset));
   pop(holder_reg);
   j(not_equal, miss, not_taken);
 
   bind(&same_contexts);
 }
 
 
-void MacroAssembler::NegativeZeroTest(CodeGenerator* cgen,
-                                      Register result,
-                                      Register op,
-                                      JumpTarget* then_target) {
-  JumpTarget ok(cgen);
-  test(result, Operand(result));
-  ok.Branch(not_zero, taken);
-  test(op, Operand(op));
-  then_target->Branch(sign, not_taken);
-  ok.Bind();
-}
-
-
 void MacroAssembler::NegativeZeroTest(Register result,
                                       Register op,
                                       Label* then_label) {
+  // Because this function is called from the code generator (with its own
+  // register allocator), it should not use registers other than result and
+  // op, and should not push or pop from the stack.
   Label ok;
   test(result, Operand(result));
   j(not_zero, &ok, taken);
   test(op, Operand(op));
   j(sign, then_label, not_taken);
   bind(&ok);
 }
 
 
 void MacroAssembler::NegativeZeroTest(Register result,
@@ skipping 390 matching lines @@
   // Indicate that code has changed.
   CPU::FlushICache(address_, size_);
 
   // Check that the code was patched as expected.
   ASSERT(masm_.pc_ == address_ + size_);
   ASSERT(masm_.reloc_info_writer.pos() == address_ + size_ + Assembler::kGap);
 }
 
 
 } }  // namespace v8::internal