Implement SLLI and fix sign extension of immediates for I-type and S-type instructions

1 files changed, 15 insertions, 0 deletions

diff --git a/src/instructions/rvi.rs b/src/instructions/rvi.rs
index 2d342df..2eb48f9 100644
--- a/src/instructions/rvi.rs
+++ b/src/instructions/rvi.rs
@@ -64,3 +64,18 @@ pub fn jal(core: &mut Core, instr: Instruction) -> InstructionResult {
     core.pc = core.pc.wrapping_add(instr.imm_j());
     InstructionResult::Normal
 }
+
+pub fn slli(core: &mut Core, instr: Instruction) -> InstructionResult {
+    core.reg_write(instr.rd(), core.reg_read(instr.rs1()) << instr.imm_shamt());
+
+    eprintln!(
+        "slli x{}, x{}, {}",
+        instr.rd(),
+        instr.rs1(),
+        instr.imm_shamt()
+    );
+
+    core.pc = core.pc.wrapping_add(4);
+
+    InstructionResult::Normal
+}