Implement SUB

2025-12-22 19:33:40 +01:00
parent d0d3775b88
commit cb100e92ac
2 changed files with 11 additions and 0 deletions
--- 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(),