20814N/Adiff --git a/js/src/ctypes/CTypes.cpp b/js/src/ctypes/CTypes.cpp

20814N/A--- a/js/src/ctypes/CTypes.cpp

20814N/A+++ b/js/src/ctypes/CTypes.cpp

20814N/A@@ -1017,6 +1017,25 @@

20814N/A };

20814N/A #endif

20814N/A

20814N/A+#ifdef SPARC

20814N/A+// Simulate x86 overflow behavior

20814N/A+template<>

20814N/A+struct ConvertImpl<JSUint64, jsdouble> {

20814N/A+ static JS_ALWAYS_INLINE JSUint64 Convert(jsdouble d) {

20814N/A+ return d >= 0xffffffffffffffff ?

20814N/A+ 0x8000000000000000 : JSUint64(d);

20814N/A+ }

20814N/A+};

20814N/A+

20814N/A+template<>

20814N/A+struct ConvertImpl<JSInt64, jsdouble> {

20814N/A+ static JS_ALWAYS_INLINE JSInt64 Convert(jsdouble d) {

20814N/A+ return d >= 0x7fffffffffffffff ?

20814N/A+ 0x8000000000000000 : JSInt64(d);

20814N/A+ }

20814N/A+};

20814N/A+#endif

20814N/A+

20814N/A template<class TargetType, class FromType>

20814N/A static JS_ALWAYS_INLINE TargetType Convert(FromType d)

20814N/A {