From 42421b7710c0897baa44e696144165fb9e9880d3 Mon Sep 17 00:00:00 2001
From: simon <Anise5-humid5-Allow-5Lulu-Honk>
Date: Mon, 13 Nov 2017 20:08:07 -0500
Subject: [PATCH] Added RCR/RCL Instructions #7.

---
 .../assembly/instruction/RclInstruction.java  | 70 +++++++++++++++++++
 .../assembly/instruction/RcrInstruction.java  | 69 ++++++++++++++++++
 .../assembly/instruction/RolInstruction.java  |  4 +-
 3 files changed, 141 insertions(+), 2 deletions(-)
 create mode 100644 Server/src/net/simon987/server/assembly/instruction/RclInstruction.java
 create mode 100644 Server/src/net/simon987/server/assembly/instruction/RcrInstruction.java

diff --git a/Server/src/net/simon987/server/assembly/instruction/RclInstruction.java b/Server/src/net/simon987/server/assembly/instruction/RclInstruction.java
new file mode 100644
index 0000000..753fe2d
--- /dev/null
+++ b/Server/src/net/simon987/server/assembly/instruction/RclInstruction.java
@@ -0,0 +1,70 @@
+package net.simon987.server.assembly.instruction;
+
+
+import net.simon987.server.assembly.Instruction;
+import net.simon987.server.assembly.Status;
+import net.simon987.server.assembly.Target;
+
+/**
+ * +---------------------+
+ * |                     |
+ * CF < 0<0<0<0<0<0<0<0 <-+
+ */
+public class RclInstruction extends Instruction {
+
+    private static final int OPCODE = 39;
+
+    public RclInstruction() {
+        super("rcl", OPCODE);
+    }
+
+    @Override
+    public Status execute(Target dst, int dstIndex, Target src, int srcIndex, Status status) {
+
+        int count = src.get(srcIndex) % 17;
+
+        int destination = dst.get(dstIndex);
+        int signBit = (destination & 0x8000);
+
+        if (status.isCarryFlag()) {
+            destination |= 0x10000;
+        }
+
+        destination = (destination << count) | (destination >>> (17 - count));
+
+        status.setCarryFlag((destination & 0x10000) == 0x10000);
+
+        if (count == 1) {
+            status.setOverflowFlag((destination & 0x8000) != signBit); //Set OF if sign bit changed
+        }
+        dst.set(dstIndex, destination & 0xFFFF);
+
+
+        return status;
+    }
+
+    @Override
+    public Status execute(Target dst, int dstIndex, int src, Status status) {
+
+        int count = src % 17;
+
+        int destination = dst.get(dstIndex);
+        int signBit = (destination & 0x8000);
+
+        if (status.isCarryFlag()) {
+            destination |= 0x10000;
+        }
+
+        destination = (destination << count) | (destination >>> (17 - count));
+
+        status.setCarryFlag((destination & 0x10000) == 0x10000);
+
+        if (count == 1) {
+            status.setOverflowFlag((destination & 0x8000) != signBit); //Set OF if sign bit changed
+        }
+        dst.set(dstIndex, destination & 0xFFFF);
+
+
+        return status;
+    }
+}
diff --git a/Server/src/net/simon987/server/assembly/instruction/RcrInstruction.java b/Server/src/net/simon987/server/assembly/instruction/RcrInstruction.java
new file mode 100644
index 0000000..2e98462
--- /dev/null
+++ b/Server/src/net/simon987/server/assembly/instruction/RcrInstruction.java
@@ -0,0 +1,69 @@
+package net.simon987.server.assembly.instruction;
+
+import net.simon987.server.assembly.Instruction;
+import net.simon987.server.assembly.Status;
+import net.simon987.server.assembly.Target;
+
+/**
+ * +---------------------+
+ * |                     |
+ * CF < 0<0<0<0<0<0<0<0 <-+
+ */
+public class RcrInstruction extends Instruction {
+
+    private static final int OPCODE = 40;
+
+    public RcrInstruction() {
+        super("rcr", OPCODE);
+    }
+
+    @Override
+    public Status execute(Target dst, int dstIndex, Target src, int srcIndex, Status status) {
+
+        int count = src.get(srcIndex) % 17;
+
+        int destination = dst.get(dstIndex) << 1;
+        int signBit = (destination & 0x10000);
+
+        if (status.isCarryFlag()) {
+            destination |= 1;
+        }
+
+        destination = (destination >>> count) | (destination << (17 - count));
+
+        status.setCarryFlag((destination & 1) == 1);
+
+        if (count == 1) {
+            status.setOverflowFlag((destination & 0x10000) != signBit); //Set OF if sign bit changed
+        }
+        dst.set(dstIndex, destination >> 1);
+
+
+        return status;
+    }
+
+    @Override
+    public Status execute(Target dst, int dstIndex, int src, Status status) {
+
+        int count = src % 17;
+
+        int destination = dst.get(dstIndex) << 1;
+        int signBit = (destination & 0x10000);
+
+        if (status.isCarryFlag()) {
+            destination |= 1;
+        }
+
+        destination = (destination >>> count) | (destination << (17 - count));
+
+        status.setCarryFlag((destination & 1) == 1);
+
+        if (count == 1) {
+            status.setOverflowFlag((destination & 0x10000) != signBit); //Set OF if sign bit changed
+        }
+        dst.set(dstIndex, destination >> 1);
+
+
+        return status;
+    }
+}
diff --git a/Server/src/net/simon987/server/assembly/instruction/RolInstruction.java b/Server/src/net/simon987/server/assembly/instruction/RolInstruction.java
index 3afbf27..b17a491 100644
--- a/Server/src/net/simon987/server/assembly/instruction/RolInstruction.java
+++ b/Server/src/net/simon987/server/assembly/instruction/RolInstruction.java
@@ -5,8 +5,8 @@ import net.simon987.server.assembly.Status;
 import net.simon987.server.assembly.Target;
 
 /**
- * +-----------------+
- * |                 |
+ *      +-----------------+
+ *      |                 |
  * CF < 0<0<0<0<0<0<0<0 <-+
  */
 public class RolInstruction extends Instruction {