implement JMZ

1 files changed, 17 insertions, 0 deletions

diff --git a/src/vm/instruction.js b/src/vm/instruction.js
index 878d20b..2afd3f7 100644
--- a/src/vm/instruction.js
+++ b/src/vm/instruction.js
@@ -107,3 +107,20 @@ exports.JMP = function(core, pc, ins) {
 	const dstLoc = core.getLocation(pc, ins.a);
 	return [dstLoc];
 }
+
+
+exports.JMZ = function(core, pc, ins) {
+	let test
+	if (ins.b.mode === AddrMode.Immediate) {
+		test = (ins.b.value === 0);
+	} else {
+		const src = core.getValue(pc, ins.b);
+		test = (src.b.value === 0);
+	}
+
+	if (test) {
+		return [core.getLocation(pc, ins.a)];
+	} else {
+		return [core.normalize(pc, 1)];
+	}
+}