From e745aa81f4422b6a24b8dce3cb6cba91eee42196 Mon Sep 17 00:00:00 2001
From: Martin Perner <martin@perner.cc>
Date: Mon, 1 Nov 2010 01:36:04 +0100
Subject: [PATCH] sim: added cmp/i

---
 3c_disasm/instr/cmp.cpp  | 68 ++++++++++++++++++++++++++++++++++++
 3c_disasm/instr/cmpi.cpp | 75 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 143 insertions(+)
 create mode 100644 3c_disasm/instr/cmp.cpp
 create mode 100644 3c_disasm/instr/cmpi.cpp

diff --git a/3c_disasm/instr/cmp.cpp b/3c_disasm/instr/cmp.cpp
new file mode 100644
index 0000000..7924ed7
--- /dev/null
+++ b/3c_disasm/instr/cmp.cpp
@@ -0,0 +1,68 @@
+#include "../Iinstr.hpp"
+
+class Ccmp : public Iinstr {
+	public:
+		Ccmp();
+		void evalInstr();
+		void execInstr();
+		std::string toString();
+		Iinstr* getNew();
+};
+
+/**
+ * Name:      create_instruction
+ * Purpose:   if compiled as shared library, this functions creates the 
+              instruction object
+
+ * Returns:   pointer to instruction object
+ */
+extern "C" Iinstr* create_instruction() {
+    return new Ccmp();
+}
+
+Iinstr* Ccmp::getNew() {
+	return new Ccmp();
+}
+
+/**
+ * Name:      destroy_instruction
+ * Purpose:   if compiled as shared library, this functions destoys the 
+              instruction object
+
+ * Parameter: IInstruction - the instruction object to delete
+ */
+extern "C" void destroy_instruction(Iinstr* p) {
+    delete p;
+}
+
+Ccmp::Ccmp()
+{
+	opcode = B5(11000);
+	name = "cmp";
+}
+
+void Ccmp::evalInstr()
+{
+	argbits >>= 15;
+	m_rb = this->getRegister(argbits);
+
+	argbits >>= 4;
+	m_ra = this->getRegister(argbits);
+}
+
+void Ccmp::execInstr()
+{
+	//cout << "should exec " << this->toString() << endl;
+	CDat ra = this->m_cpu->getRegister(m_ra);
+	CDat rb = this->m_cpu->getRegister(m_rb);
+	CDatd val = ra - rb;
+	this->m_cpu->updateFlags(val, ra, rb);
+}
+
+std::string Ccmp::toString()
+{
+	stringstream op;
+	op << this->getName();
+	op << " r" << m_ra << ", r" << m_rb;
+	return op.str();
+}
diff --git a/3c_disasm/instr/cmpi.cpp b/3c_disasm/instr/cmpi.cpp
new file mode 100644
index 0000000..0de9659
--- /dev/null
+++ b/3c_disasm/instr/cmpi.cpp
@@ -0,0 +1,75 @@
+#include "../Iinstr.hpp"
+
+class Ccmpi : public Iinstr {
+	public:
+		Ccmpi();
+		void evalInstr();
+		void execInstr();
+		std::string toString();
+		Iinstr* getNew();
+};
+
+/**
+ * Name:      create_instruction
+ * Purpose:   if compiled as shared library, this functions creates the 
+              instruction object
+
+ * Returns:   pointer to instruction object
+ */
+extern "C" Iinstr* create_instruction() {
+    return new Ccmpi();
+}
+
+Iinstr* Ccmpi::getNew() {
+	return new Ccmpi();
+}
+
+/**
+ * Name:      destroy_instruction
+ * Purpose:   if compiled as shared library, this functions destoys the 
+              instruction object
+
+ * Parameter: IInstruction - the instruction object to delete
+ */
+extern "C" void destroy_instruction(Iinstr* p) {
+    delete p;
+}
+
+Ccmpi::Ccmpi()
+{
+	opcode = B5(11001);
+	name = "cmpi";
+}
+
+void Ccmpi::evalInstr()
+{
+	argbits >>= 3;
+	dynamic_bitset<> immb = argbits;
+	immb.resize(16);
+	this->m_imm = this->generate16ImmSign(immb.to_ulong());
+
+	argbits >>= 16;
+	m_ra = this->getRegister(argbits);
+}
+
+void Ccmpi::execInstr()
+{
+	//cout << "should exec " << this->toString() << endl;
+	CDat ra = this->m_cpu->getRegister(m_ra);
+	CDatd reg = ra - this->m_imm;
+	this->m_cpu->updateFlags(reg, ra, this->m_imm);
+}
+
+std::string Ccmpi::toString()
+{
+	stringstream op;
+	op << this->getName();
+
+	if(m_d) op << 'D';
+	if(m_s) op << 'S';
+	if(m_c) op << 'C';
+
+	op << this->getConditionFlag() << " r" << m_rd << ", r" << m_ra << ", " << m_imm;
+
+	return op.str();
+}
-- 
2.25.1