Treat casts int64 -> float32 as primitive operations instead of two

casts int64 -> float64 -> float32.  The latter causes double rounding
errors.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2290 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

1 files changed, 12 insertions, 0 deletions

diff --git a/common/Values.v b/common/Values.v
index 7caf551..b937071 100644
--- a/common/Values.v
+++ b/common/Values.v
@@ -438,6 +438,18 @@ Definition floatoflongu (v: val) : option val :=
   | _ => None
   end.
 
+Definition singleoflong (v: val) : option val :=
+  match v with
+  | Vlong n => Some (Vfloat (Float.singleoflong n))
+  | _ => None
+  end.
+
+Definition singleoflongu (v: val) : option val :=
+  match v with
+  | Vlong n => Some (Vfloat (Float.singleoflongu n))
+  | _ => None
+  end.
+
 Definition addl (v1 v2: val): val :=
   match v1, v2 with
   | Vlong n1, Vlong n2 => Vlong(Int64.add n1 n2)