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-rw-r--r--include/opcode/s390.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/opcode/s390.h b/include/opcode/s390.h
index 2cbe5f5..122c60c 100644
--- a/include/opcode/s390.h
+++ b/include/opcode/s390.h
@@ -147,4 +147,7 @@ extern const struct s390_operand s390_operands[];
the instruction may be optional. */
#define S390_OPERAND_OPTIONAL 0x400
+/* The operand needs to be an even register number. */
+#define S390_OPERAND_REG_EVEN 0x800
+
#endif /* S390_H */