From efc88b33e3672435a0ef188f0236e60572d3ce2b Mon Sep 17 00:00:00 2001
From: zhangxun <1958638841@qq.com>
Date: Thu, 10 Jul 2025 16:08:21 +0800
Subject: [PATCH] =?UTF-8?q?docs:=20=E8=A1=A5=E5=85=85=20double64=20?=
 =?UTF-8?q?=E8=BD=AC=E6=8D=A2=E6=8C=87=E4=BB=A4=E7=9A=84=E6=96=87=E6=A1=A3?=
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---
 .../org/jcnc/snow/vm/engine/VMOpCode.java     | 28 +++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/src/main/java/org/jcnc/snow/vm/engine/VMOpCode.java b/src/main/java/org/jcnc/snow/vm/engine/VMOpCode.java
index 2bf7ec5..fcf9e49 100644
--- a/src/main/java/org/jcnc/snow/vm/engine/VMOpCode.java
+++ b/src/main/java/org/jcnc/snow/vm/engine/VMOpCode.java
@@ -2268,9 +2268,33 @@ public class VMOpCode {
     // endregion Float32
 
     // region Double64  (0x00D9-0xDD)
-
+    /**
+     * D2B Opcode: Represents the type conversion operation from double64 to byte8 in the virtual machine.
+     * <p>This opcode is implemented by the {@link D2BCommand} class, which defines its specific execution logic.</p>
+     *
+     * <p>Execution Steps:</p>
+     * <ol>
+     *     <li>Pop the top double64 value from the operand stack.</li>
+     *     <li>Convert the double64 value to a byte8 value (this may involve truncation).</li>
+     *     <li>Push the converted byte8 value back onto the operand stack for subsequent operations.</li>
+     * </ol>
+     *
+     * <p>This opcode is used to narrow a double64 value to a byte8 type for further integer-based processing.</p>
+     */
     public static final int D2B = 0x00D9;
-
+    /**
+     * D2I Opcode: Represents the type conversion operation from double64 to short16 in the virtual machine.
+     * <p>This opcode is implemented by the {@link D2ICommand} class, which defines its specific execution logic.</p>
+     *
+     * <p>Execution Steps:</p>
+     * <ol>
+     *     <li>Pop the top double64 value from the operand stack.</li>
+     *     <li>Convert the double64 value to a short16 value (this may involve truncation).</li>
+     *     <li>Push the converted short16 value back onto the operand stack for subsequent operations.</li>
+     * </ol>
+     *
+     * <p>This opcode is used to narrow a double64 value to a short16 type for further integer-based processing.</p>
+     */
     public static final int D2S = 0x00DA;
 
     /**