From bc5fc660caa7881458e0d62905a1aec38dd2aaf0 Mon Sep 17 00:00:00 2001
From: "Jakob L. Kreuze" <zerodaysfordays@sdf.lonestar.org>
Date: Fri, 27 Dec 2019 17:08:40 -0500
Subject: Implement SE instruction.

---
 asm.myr | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'asm.myr')

diff --git a/asm.myr b/asm.myr
index 2d2d172..cd0db90 100644
--- a/asm.myr
+++ b/asm.myr
@@ -128,6 +128,18 @@ const emitinstr = {p
                 -> `std.Err(std.fmt("invalid arguments to JP: {}, {}", p[1], p[2]))
             ;;
         ;;
+    | "SE":
+        if p.len < 3
+            -> `std.Err("SE missing arguments")
+        ;;
+        match (parselit(p[1]), parselit(p[2]))
+        | (`Register(m), `Number(n)):
+            b = `std.Some([0x30 | (m & 0x0f), (n & 0xff)])
+        | (`Register(m), `Register(n)):
+            b = `std.Some([0x50 | (m & 0x0f), (n & 0x0f) << 1])
+        | _:
+            -> `std.Err(std.fmt("invalid arguments to SE: {}, {}", p[1], p[2]))
+        ;;
     | _:
         -> `std.Err(std.fmt("unrecognized instruction {}", p[0]))
     ;;
-- 
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