YJIT: Eliminate unnecessary mov for trampolines (#7537)

1 files changed, 4 insertions, 1 deletions

diff --git a/yjit/src/backend/ir.rs b/yjit/src/backend/ir.rs
index c2b6afd760..e27049ee33 100644
--- a/yjit/src/backend/ir.rs
+++ b/yjit/src/backend/ir.rs
@@ -1491,7 +1491,10 @@ impl Assembler {
     }
 
     pub fn load_into(&mut self, dest: Opnd, opnd: Opnd) {
-        self.push_insn(Insn::LoadInto { dest, opnd });
+        match (dest, opnd) {
+            (Opnd::Reg(dest), Opnd::Reg(opnd)) if dest == opnd => {}, // skip if noop
+            _ => self.push_insn(Insn::LoadInto { dest, opnd }),
+        }
     }
 
     #[must_use]