Implement SE instruction.

1 files changed, 12 insertions, 0 deletions

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]))
     ;;