Implement Zalrsc

1 files changed, 17 insertions, 0 deletions

diff --git a/src/decode.rs b/src/decode.rs
index 480fdff..be0dbc3 100644
--- a/src/decode.rs
+++ b/src/decode.rs
@@ -4,6 +4,8 @@
 // This file is part of TRVE (https://gitea.taitep.se/taitep/trve)
 // See LICENSE file in the project root for full license text.
 
+use std::sync::atomic::Ordering;
+
 const MASK_REGISTER: u32 = 0x1f;
 
 #[derive(Clone, Copy)]
@@ -104,7 +106,22 @@ impl Instruction {
     }
 
     /// Mostly/only used for the SYSTEM opcode
+    #[inline]
     pub fn funct12(self) -> u16 {
         (self.0 >> 20) as u16
     }
+
+    /// Looks at the aq/rl bits of atomic instructions and converts to an Ordering
+    #[inline]
+    pub fn amo_ordering(self) -> Ordering {
+        let aq = self.0 >> 26 & 1 != 0;
+        let rl = self.0 >> 25 & 1 != 0;
+
+        match (aq, rl) {
+            (false, false) => Ordering::Relaxed,
+            (false, true) => Ordering::Release,
+            (true, false) => Ordering::Acquire,
+            (true, true) => Ordering::AcqRel,
+        }
+    }
 }