Use Swap opcode if possible instead of RotateLeft

boa-dev · Oct 30, 2022 · 2e6f543 · 2e6f543
1 parent 2e32193
commit 2e6f543
Showing 1 changed file with 7 additions and 3 deletions.
diff --git a/boa_engine/src/bytecompiler/mod.rs b/boa_engine/src/bytecompiler/mod.rs
@@ -715,9 +715,13 @@ impl<'b> ByteCompiler<'b> {
     // The wrap is needed so it can match the function signature.
     #[allow(clippy::unnecessary_wraps)]
     fn access_set_top_of_stack_expr_fn(compiler: &mut ByteCompiler<'_>, level: u8) -> JsResult<()> {
-        if level != 0 {
-            compiler.emit_opcode(Opcode::RotateLeft);
-            compiler.emit_u8(level + 1);
+        match level {
+            0 => {}
+            1 => compiler.emit_opcode(Opcode::Swap),
+            _ => {
+                compiler.emit_opcode(Opcode::RotateLeft);
+                compiler.emit_u8(level + 1);
+            }
         }
         Ok(())
     }