Restore saved caller FP registers on stub failure

src/arguments.cc

Index: src/arguments.cc
diff --git a/src/arguments.cc b/src/arguments.cc
index 3a4d733152ff8c7a0b0b7f059118541971852b1e..abcc8a7756457d9c461dd07799eb9fa3ac7b6cef 100644
--- a/src/arguments.cc
+++ b/src/arguments.cc
@@ -116,5 +116,11 @@ FOR_EACH_CALLBACK_TABLE_MAPPING_2_VOID_RETURN(WRITE_CALL_2_VOID)
 #undef WRITE_CALL_2
 #undef WRITE_CALL_2_VOID
 
+#ifdef DEBUG
+double ClobberDoubleRegisters(double x1, double x2, double x3, double x4) {

[danno, 2013/11/20 13:55:52]

This is pretty fragile. How about making this a platform-specific function that
is written in assembly? It also doesn't need to be #if DEBUG, either, the linker
will strip it if it's not used, and I prefer to compile all code if possible.

[ulan, 2013/11/20 16:20:05]

Removed DEBUG and add TODO for platform specific assembly implementation as
discussed.

On 2013/11/20 13:55:52, danno wrote:

+  return x1 * 1.01 + x2 * 2.02 + x3 * 3.03 + x4 * 4.04;
+}
+#endif
+
 
 } }  // namespace v8::internal