1 files changed, 43 insertions, 0 deletions
diff --git a/asm/intel64/dec.cpp b/asm/intel64/dec.cpp
new file mode 100644
index 0000000..dab603a
--- /dev/null
+++ b/asm/intel64/dec.cpp
@@ -0,0 +1,43 @@
+#include "dec.h"
+
+#include "codes.h"
+
+#include <asm/assembler.h>
+#include <asm/operators.h>
+
+#include <asm/intel64/codes.h>
+
+using namespace std::string_literals;
+
+Op_dec::Op_dec(Asm::Args& args)
+{
+ if (args[0].type() == typeid(Asm::Args::Register8)) { // dec reg8
+  machine_code = std::vector<uint8_t>{ 0xFE } +
+   ModRM("/1", std::any_cast<Asm::Args::Register8>(args[0]).name());
+ } else if (args[0].type() == typeid(Asm::Args::Register32)) { // dec reg32
+  machine_code = std::vector<uint8_t>{ 0xFF } +
+   ModRM("/1", std::any_cast<Asm::Args::Register32>(args[0]).name());
+ } else if (args[0].type() == typeid(Asm::Args::Register64)) { // dec reg64
+  machine_code = REX("W") + std::vector<uint8_t>{ 0xFF } +
+   ModRM("/1", std::any_cast<Asm::Args::Register64>(args[0]).name());
+ } else {
+  throw std::runtime_error("Unimplemented: dec "s + args[0].type().name());
+ }
+}
+
+namespace {
+
+bool registered {
+ registerOp(mangleName<Asm::Args::Register8>("dec"), [](Asm::Args& args) -> std::shared_ptr<Op>{
+               return std::make_shared<Op_dec>(args);
+            }) &&
+ registerOp(mangleName<Asm::Args::Register32>("dec"), [](Asm::Args& args) -> std::shared_ptr<Op>{
+               return std::make_shared<Op_dec>(args);
+            }) &&
+ registerOp(mangleName<Asm::Args::Register64>("dec"), [](Asm::Args& args) -> std::shared_ptr<Op>{
+               return std::make_shared<Op_dec>(args);
+            })
+};
+
+}
+