[meta] Riscv: add back stacknull encodings for copy_nop;

2019-07-08 13:00:02 +02:00
parent 59f6c81e4f
commit 84a6795873
2 changed files with 24 additions and 1 deletions
--- a/cranelift/codegen/meta/src/isa/riscv/recipes.rs
+++ b/cranelift/codegen/meta/src/isa/riscv/recipes.rs
@@ -263,5 +263,13 @@ pub fn define<'formats>(
            .emit("unimplemented!();"),
    );

+    // Stack-slot to same stack-slot copy, which is guaranteed to turn into a no-op.
+    recipes.push(
+        EncodingRecipeBuilder::new("stacknull", f_unary, 0)
+            .operands_in(vec![Stack::new(gpr)])
+            .operands_out(vec![Stack::new(gpr)])
+            .emit(""),
+    );
+
    recipes
 }