Use FAR jump in GenerateCompareFlatAsciiStrings.

src/x64/code-stubs-x64.cc

Index: src/x64/code-stubs-x64.cc
diff --git a/src/x64/code-stubs-x64.cc b/src/x64/code-stubs-x64.cc
index 2f6585641a391e7f430041266614b8c06f8c1c93..45d6fe375be6c1e64f9384f32795446baf76096c 100644
--- a/src/x64/code-stubs-x64.cc
+++ b/src/x64/code-stubs-x64.cc
@@ -4335,7 +4335,10 @@ void StringCompareStub::GenerateCompareFlatAsciiStrings(MacroAssembler* masm,
   // Compare loop.
   Label result_not_equal;
   GenerateAsciiCharsCompareLoop(masm, left, right, min_length, scratch2,
-                                &result_not_equal, Label::kNear);
+                                &result_not_equal,
+                                // In debug-code mode, SmiTest below might push
+                                // the target label outside the near range.
+                                FLAG_debug_code ? Label::kFar : Label::kNear);

[Jakob Kummerow, 2013/12/06 09:08:38]

nit: I'd prefer to keep the effect of FLAG_debug_code on emitted code to a
minimum. Let's just always use Label::kFar here. (Since that's the default, you
can also just skip the explicit parameter; but please do keep the comment to
warn future contributors.)

 
   // Completed loop without finding different characters.
   // Compare lengths (precomputed).