1 files changed, 39 insertions, 0 deletions
diff --git a/src/instset.c b/src/instset.c
new file mode 100644
index 0000000..2ab127a
--- /dev/null
+++ b/src/instset.c
@@ -0,0 +1,39 @@
+#include <assert.h>
+#include "types.h"
+#include "instset.h"
+
+boolean sal_is_inst(uint32 word)
+{
+	/* Test if a given 32 bit integer contains a valid Salis instruction.
+	*/
+	return word < INST_COUNT;
+}
+
+static boolean is_in_between(uint32 inst, uint32 low, uint32 hi)
+{
+	/* Test whether a Salis instruction lies within a given range. This is
+	useful for identifying template instructions and/or register modifiers.
+	*/
+	assert(sal_is_inst(inst));
+	assert(sal_is_inst(low));
+	assert(sal_is_inst(hi));
+	return (inst >= low) && (inst <= hi);
+}
+
+boolean sal_is_template(uint32 inst)
+{
+	/* Test whether a given instruction is a template element
+	(i.e. NOP0 or NOP1).
+	*/
+	assert(sal_is_inst(inst));
+	return is_in_between(inst, NOP0, NOP1);
+}
+
+boolean sal_is_mod(uint32 inst)
+{
+	/* Test whether a given instruction is a register modifier
+	(i.e. MODA, MODB, MODC or MODD).
+	*/
+	assert(sal_is_inst(inst));
+	return is_in_between(inst, MODA, MODD);
+}