feat/x0: doc

scroll-tech · Oct 31, 2024 · a4857e9 · a4857e9
1 parent 2a36b64
commit a4857e9
Showing 1 changed file with 1 addition and 0 deletions.
diff --git a/ceno_emul/src/rv32im.rs b/ceno_emul/src/rv32im.rs
@@ -201,6 +201,7 @@ pub struct InsnCodes {
 }
 
 impl DecodedInstruction {
+    /// A virtual register which absorbs the writes to x0.
     pub const RD_NULL: u32 = 32;
 
     pub fn new(insn: u32) -> Self {