1 files changed, 28 insertions, 0 deletions
diff --git a/src/instructions/rvi.rs b/src/instructions/rvi.rs
new file mode 100644
index 0000000..8e7dade
--- /dev/null
+++ b/src/instructions/rvi.rs
@@ -0,0 +1,28 @@
+use crate::{
+    core::{Core, InstructionResult},
+    decode::Instruction,
+    instructions::{
+        OpcodeHandler,
+        gen_tools::insert_funct3_splitter,
+        opcodes::{FUNCT3_ADDI, OP_IMM},
+    },
+};
+
+pub(super) fn add_instrs(list: &mut [OpcodeHandler; 32]) {
+    let funct3_split_op_imm = insert_funct3_splitter(&mut list[OP_IMM as usize].splitter);
+    funct3_split_op_imm[FUNCT3_ADDI as usize].handler =
+        Some(super::InstructionHandler { runner: addi });
+}
+
+fn addi(core: &mut Core, instr: Instruction) -> InstructionResult {
+    eprintln!("Running ADDI");
+
+    core.reg_write(
+        instr.rd(),
+        core.reg_read(instr.rs1()).wrapping_add(instr.imm_i()),
+    );
+
+    core.pc = core.pc.wrapping_add(4);
+
+    InstructionResult::Normal
+}