Extended inline asm: revised treatment of clobbered registers.

- Treat clobbered registers as being destroyed by EF_inline_asm builtins
  (which is the truth, semantically).
- To enable the above, represent clobbers as Coq strings rather than idents
  and move register_by_name from Machregsaux.ml to Machregs.v.
- Side benefit: more efficient implementation of Machregsaux.name_of_register.

-# Please enter the commit message for your changes. Lines starting

1 files changed, 9 insertions, 34 deletions

diff --git a/powerpc/Machregsaux.ml b/powerpc/Machregsaux.ml
index ba111089..8c3017ff 100644
--- a/powerpc/Machregsaux.ml
+++ b/powerpc/Machregsaux.ml
@@ -12,49 +12,24 @@
 
 (** Auxiliary functions on machine registers *)
 
+open Camlcoq
 open Machregs
 
-let register_names = [
-  ("R3", R3);  ("R4", R4);  ("R5", R5);  ("R6", R6);
-  ("R7", R7);  ("R8", R8);  ("R9", R9);  ("R10", R10);
-  ("R11", R11); ("R12", R12);
-  ("R14", R14); ("R15", R15); ("R16", R16);
-  ("R17", R17); ("R18", R18); ("R19", R19); ("R20", R20);
-  ("R21", R21); ("R22", R22); ("R23", R23); ("R24", R24);
-  ("R25", R25); ("R26", R26); ("R27", R27); ("R28", R28);
-  ("R29", R29); ("R30", R30); ("R31", R31);
-  ("F0", F0); ("F1", F1);  ("F2", F2);  ("F3", F3);  ("F4", F4);
-  ("F5", F5);  ("F6", F6);  ("F7", F7);  ("F8", F8);
-  ("F9", F9);  ("F10", F10); ("F11", F11); ("F12", F12);
-  ("F13", F13); ("F14", F14); ("F15", F15);
-  ("F16", F16); ("F17", F17); ("F18", F18); ("F19", F19);
-  ("F20", F20); ("F21", F21); ("F22", F22); ("F23", F23);
-  ("F24", F24); ("F25", F25); ("F26", F26); ("F27", F27);
-  ("F28", F28); ("F29", F29); ("F30", F30); ("F31", F31)
-]
+let register_names : (mreg, string) Hashtbl.t = Hashtbl.create 31
+
+let _ =
+  List.iter
+    (fun (s, r) -> Hashtbl.add register_names r (camlstring_of_coqstring s))
+    Machregs.register_names
 
 let scratch_register_names = [ "R0" ]
 
 let name_of_register r =
-  let rec rev_assoc = function
-  | [] -> None
-  | (a, b) :: rem -> if b = r then Some a else rev_assoc rem
-  in rev_assoc register_names
+  try Some (Hashtbl.find register_names r) with Not_found -> None
 
 let register_by_name s =
-  try
-    Some(List.assoc (String.uppercase s) register_names)
-  with Not_found ->
-    None
+  Machregs.register_by_name (coqstring_of_camlstring (String.uppercase s))
 
 let can_reserve_register r =
   List.mem r Conventions1.int_callee_save_regs
   || List.mem r Conventions1.float_callee_save_regs
-
-let mregs_of_clobber idl =
-  List.fold_left
-    (fun l c ->
-      match register_by_name (Camlcoq.extern_atom c) with
-      | Some r -> r :: l
-      | None -> l)
-    [] idl