Merge of "newspilling" branch:

- Support single-precision floats as first-class values
- Introduce chunks Many32, Many64 and types Tany32, Tany64 to
  support saving and restoring registers without knowing
  the exact types (int/single/float) of their contents, just
  their sizes.
- Memory model: generalize the opaque encoding of pointers to
  apply to any value, not just pointers, if chunks Many32/Many64
  are selected.
- More properties of FP arithmetic proved.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@2537 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

1 files changed, 12 insertions, 0 deletions

diff --git a/backend/SelectDiv.vp b/backend/SelectDiv.vp
index 938ce5d..a275a85 100644
--- a/backend/SelectDiv.vp
+++ b/backend/SelectDiv.vp
@@ -182,4 +182,16 @@ Nondetfunction divf (e1: expr) (e2: expr) :=
   | _ => Eop Odivf (e1 ::: e2 ::: Enil)
   end.
 
+Definition divfsimm (e: expr) (n: float32) :=
+  match Float32.exact_inverse n with
+  | Some n' => Eop Omulfs (e ::: Eop (Osingleconst n') Enil ::: Enil)
+  | None    => Eop Odivfs (e ::: Eop (Osingleconst n) Enil ::: Enil)
+  end.
+
+Nondetfunction divfs (e1: expr) (e2: expr) :=
+  match e2 with
+  | Eop (Osingleconst n2) Enil => divfsimm e1 n2
+  | _ => Eop Odivfs (e1 ::: e2 ::: Enil)
+  end.
+