From cb100e92ac6ff10e5468678d734adb633b04c5c4 Mon Sep 17 00:00:00 2001
From: taitep <taitep@taitep.se>
Date: Mon, 22 Dec 2025 19:33:40 +0100
Subject: Implement SUB

---
 src/instructions/rvi.rs | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/instructions/rvi.rs')

diff --git a/src/instructions/rvi.rs b/src/instructions/rvi.rs
index 69670d0..df3d9d5 100644
--- a/src/instructions/rvi.rs
+++ b/src/instructions/rvi.rs
@@ -21,6 +21,16 @@ pub fn add(core: &mut Core, instr: Instruction) -> InstructionResult {
     InstructionResult::Normal
 }
 
+pub fn sub(core: &mut Core, instr: Instruction) -> InstructionResult {
+    core.reg_write(
+        instr.rd(),
+        core.reg_read(instr.rs1())
+            .wrapping_sub(core.reg_read(instr.rs2())),
+    );
+    core.advance_pc();
+    InstructionResult::Normal
+}
+
 pub fn addi(core: &mut Core, instr: Instruction) -> InstructionResult {
     core.reg_write(
         instr.rd(),
-- 
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