+#ifdef CALLER_SAVES_SparkHd
+#define CALLER_SAVE_SparkHd SAVE_SparkHd = SparkHd;
+#define CALLER_RESTORE_SparkHd SparkHd = SAVE_SparkHd;
+#else
+#define CALLER_SAVE_SparkHd /* nothing */
+#define CALLER_RESTORE_SparkHd /* nothing */
+#endif
+
+#ifdef CALLER_SAVES_SparkTl
+#define CALLER_SAVE_SparkTl SAVE_SparkTl = SparkTl;
+#define CALLER_RESTORE_SparkTl SparkTl = SAVE_SparkTl;
+#else
+#define CALLER_SAVE_SparkTl /* nothing */
+#define CALLER_RESTORE_SparkTl /* nothing */
+#endif
+
+#ifdef CALLER_SAVES_SparkBase
+#define CALLER_SAVE_SparkBase SAVE_SparkBase = SparkBase;
+#define CALLER_RESTORE_SparkBase SparkBase = SAVE_SparkBase;
+#else
+#define CALLER_SAVE_SparkBase /* nothing */
+#define CALLER_RESTORE_SparkBase /* nothing */
+#endif
+
+#ifdef CALLER_SAVES_SparkLim
+#define CALLER_SAVE_SparkLim SAVE_SparkLim = SparkLim;
+#define CALLER_RESTORE_SparkLim SparkLim = SAVE_SparkLim;
+#else
+#define CALLER_SAVE_SparkLim /* nothing */
+#define CALLER_RESTORE_SparkLim /* nothing */
+#endif
+