From 4aebb30c43906697f60b437abe049f1cb8153f16 Mon Sep 17 00:00:00 2001
From: uvok
Date: Mon, 5 Jan 2026 13:29:32 +0100
Subject: Improve assembler syntax

- 3 letter jumps
- encode literal zero
- no space between dests
- consistent spacing, commas
---
 nandgame/assembler/disas.py | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

(limited to 'nandgame/assembler/disas.py')

diff --git a/nandgame/assembler/disas.py b/nandgame/assembler/disas.py
index 11f7508..f7669c0 100755
--- a/nandgame/assembler/disas.py
+++ b/nandgame/assembler/disas.py
@@ -14,7 +14,7 @@ def decode_jump(ins: int) -> str:
     if (ins & 0x7) == 0:
         return ""
     if (ins & 0x7) == 0x7:
-        return "j"
+        return "jmp"
 
     jl = (ins & (1 << 2)) != 0
     je = (ins & (1 << 1)) != 0
@@ -32,11 +32,11 @@ def decode_jump(ins: int) -> str:
 
     # implied: only one flag is 1
     if jl:
-        return "jl"
+        return "jlt"
     if je:
-        return "je"
+        return "jeq"
     if jg:
-        return "jg"
+        return "jgt"
 
     return "<unknown>"
 
@@ -54,7 +54,7 @@ def decode_ins(ins: int) -> (str, bool):
     if opcode == 0b010:
         return "xor", True
     if opcode == 0b011:
-        return "neg", False
+        return "not", False
     if opcode == 0b100:
         return "add", True
     if opcode == 0b101:
@@ -74,7 +74,7 @@ def decode_arg1(ins: int) -> str:
     sw = (ins & (1 << 6)) != 0
 
     if zx:
-        return "0"
+        return "#0"
     if not sw:
         return "D"
     return "M" if use_mem else "A"
@@ -99,13 +99,13 @@ def decode_dest(ins: int) -> str:
     dM = (ins & (1 << 3)) != 0
     dest = ""
     if dA:
-        dest += "A "
+        dest += "A"
     if dD:
-        dest += "D "
+        dest += "D"
     if dM:
         dest += "M"
 
-    return dest
+    return dest if dest else "_"
 
 
 def decode_instruction_complete(ins: int) -> list[str]:
@@ -128,10 +128,10 @@ def decode_instruction_complete(ins: int) -> list[str]:
 def print_decoded(ins: int) -> str:
     (codename, dest, op1, op2, jumpdest) = decode_instruction_complete(ins)
 
-    dest_str = f"{dest:<5}, " if dest else 7 * " "
+    dest_str = f"{dest}, " if dest else 7 * " "
+    op1_str = f"{op1}{", " if op2 else ""}"
     jumpdest_str = f"; {jumpdest}" if jumpdest else ""
-    op2_str = f", {op2}" if op2 else ""
-    return f"{codename:<5}{dest_str}{op1:<2}{op2_str:<5}{jumpdest_str}"
+    return f"{codename:<5}{dest_str:<6}{op1_str:<4}{op2:<5}{jumpdest_str}"
 
 
 def main():
-- 
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