From 2b5eb96187c8aa67b5d43abf1917e7158620f2f8 Mon Sep 17 00:00:00 2001
From: taitep <taitep@taitep.se>
Date: Mon, 22 Dec 2025 21:17:38 +0100
Subject: [PATCH] Implement BLTU

---
 src/instructions.rs     |  1 +
 src/instructions/rvi.rs | 10 ++++++++++
 2 files changed, 11 insertions(+)

diff --git a/src/instructions.rs b/src/instructions.rs
index c184065..4a7a627 100644
--- a/src/instructions.rs
+++ b/src/instructions.rs
@@ -52,6 +52,7 @@ pub(crate) fn find_and_exec(instr: Instruction, core: &mut Core) -> Option<Instr
             // BRANCH
             0b000 => Some(rvi::beq(core, instr)),
             0b001 => Some(rvi::bne(core, instr)),
+            0b110 => Some(rvi::bltu(core, instr)),
             0b111 => Some(rvi::bgeu(core, instr)),
             _ => None,
         },
diff --git a/src/instructions/rvi.rs b/src/instructions/rvi.rs
index 6f7dfd2..7d57ce6 100644
--- a/src/instructions/rvi.rs
+++ b/src/instructions/rvi.rs
@@ -132,3 +132,13 @@ pub fn bgeu(core: &mut Core, instr: Instruction) -> InstructionResult {
 
     InstructionResult::Normal
 }
+
+pub fn bltu(core: &mut Core, instr: Instruction) -> InstructionResult {
+    if core.reg_read(instr.rs1()) < core.reg_read(instr.rs2()) {
+        core.pc = core.pc.wrapping_add(instr.imm_b());
+    } else {
+        core.advance_pc();
+    }
+
+    InstructionResult::Normal
+}