Implement SRLI

2 files changed, 11 insertions, 0 deletions

diff --git a/src/instructions.rs b/src/instructions.rs
index 8c9c910..e4d5b03 100644
--- a/src/instructions.rs
+++ b/src/instructions.rs
@@ -25,6 +25,11 @@ pub(crate) fn find_and_exec(instr: Instruction, core: &mut Core) -> Option<Instr
             // OP_IMM
             0b000 => Some(rvi::addi(core, instr)),
             0b001 => (instr.funct6() == 0).then(|| rvi::slli(core, instr)),
+            0b101 => match instr.funct6() {
+                // immediate right-shift
+                0b000000 => Some(rvi::srli(core, instr)),
+                _ => None,
+            },
             0b111 => Some(rvi::andi(core, instr)),
             _ => None,
         },
diff --git a/src/instructions/rvi.rs b/src/instructions/rvi.rs
index 7ca9acc..6766fdf 100644
--- a/src/instructions/rvi.rs
+++ b/src/instructions/rvi.rs
@@ -79,6 +79,12 @@ pub fn slli(core: &mut Core, instr: Instruction) -> InstructionResult {
     InstructionResult::Normal
 }
 
+pub fn srli(core: &mut Core, instr: Instruction) -> InstructionResult {
+    core.reg_write(instr.rd(), core.reg_read(instr.rs1()) >> instr.imm_shamt());
+    core.advance_pc();
+    InstructionResult::Normal
+}
+
 pub fn lui(core: &mut Core, instr: Instruction) -> InstructionResult {
     core.reg_write(instr.rd(), instr.imm_u());
     core.advance_pc();