nasm.h: introduce is_class macro helper

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

diff --git a/nasm.h b/nasm.h
index 00cbddc..2982101 100644 (file)
--- a/nasm.h
+++ b/nasm.h
@@ -539,6 +539,8 @@ typedef uint32_t opflags_t;
 #define MEMORY         0x0000c000U
 #define REGMEM         0x00008000U   /* for r/m, ie EA, operands */
 
+#define is_class(class, op)     (!((opflags_t)(class) & ~(opflags_t)(op)))
+
 /* Register classes */
 #define REG_EA         0x00009000U   /* 'normal' reg, qualifies as EA */
 #define RM_GPR         0x00208000U   /* integer operand */