select rotate ops 32-bit

1 files changed, 14 insertions, 0 deletions

diff --git a/mppa_k1c/SelectOp.vp b/mppa_k1c/SelectOp.vp
index bb8af2ed..14753871 100644
--- a/mppa_k1c/SelectOp.vp
+++ b/mppa_k1c/SelectOp.vp
@@ -235,10 +235,24 @@ Nondetfunction orimm (n1: int) (e2: expr) :=
        | _ => Eop (Oorimm n1) (e2:::Enil)
   end.
 
+Definition same_expr_pure (e1 e2: expr) :=
+  match e1, e2 with
+  | Evar v1, Evar v2 => if ident_eq v1 v2 then true else false
+  | _, _ => false
+  end.
+
 Nondetfunction or (e1: expr) (e2: expr) :=
   match e1, e2 with
   | Eop (Ointconst n1) Enil, t2 => orimm n1 t2
   | t1, Eop (Ointconst n2) Enil => orimm n2 t1
+  | Eop (Oshlimm n1) (t1:::Enil), Eop (Oshruimm n2) (t2:::Enil) =>
+      if Int.eq (Int.add n1 n2) Int.iwordsize && same_expr_pure t1 t2
+      then Eop (Ororimm n2) (t1:::Enil)
+      else Eop Oor (e1:::e2:::Enil)
+  | Eop (Oshruimm n2) (t2:::Enil), Eop (Oshlimm n1) (t1:::Enil) =>
+      if Int.eq (Int.add n1 n2) Int.iwordsize && same_expr_pure t1 t2
+      then Eop (Ororimm n2) (t1:::Enil)
+      else Eop Oor (e1:::e2:::Enil)
   | _, _ => Eop Oor (e1:::e2:::Enil)
   end.