+#define bci_TESTLT_I 15
+#define bci_TESTEQ_I 16
+#define bci_TESTLT_F 17
+#define bci_TESTEQ_F 18
+#define bci_TESTLT_D 19
+#define bci_TESTEQ_D 20
+#define bci_TESTLT_P 21
+#define bci_TESTEQ_P 22
+#define bci_CASEFAIL 23
+#define bci_ENTER 24
+#define bci_RETURN 25
+#define bci_STKCHECK 26
+#define bci_JMP 27
+
+
+/* If a BCO definitely requires less than this many words of stack,
+ don't include an explicit STKCHECK insn in it. The interpreter
+ will check for this many words of stack before running each BCO,
+ rendering an explicit check unnecessary in the majority of
+ cases. */
+#define INTERP_STACK_CHECK_THRESH 50