Support for 64-bit architectures: generic support

- Introduce Archi.ptr64 parameter.
- Define module Ptrofs of integers as wide as a pointer (64 if Archi.ptr64, 32 otherwise).
- Use Ptrofs.int as the offset type for Vptr values and anywhere pointer offsets are manipulated.
- Modify Val operations that handle pointers (e.g. Val.add, Val.sub, Val.cmpu) so that in 64-bit pointer mode it is the "long" operation (e.g. Val.addl, Val.subl, Val.cmplu) that handles pointers.
- Update the memory model accordingly.
- Modify C operations that handle pointers (e.g. addition, subtraction, comparisons) accordingly.
- Make it possible to turn off the splitting of 64-bit integers into pairs of 32-bit integers.
- Update the compiler front-end and back-end accordingly.

1 files changed, 6 insertions, 3 deletions

diff --git a/driver/Driver.ml b/driver/Driver.ml
index b89d93c1..4bd08a88 100644
--- a/driver/Driver.ml
+++ b/driver/Driver.ml
@@ -536,9 +536,12 @@ let _ =
       | "arm"     -> if Configuration.is_big_endian
                      then Machine.arm_bigendian
                      else Machine.arm_littleendian
-      | "ia32"    -> if Configuration.abi = "macosx"
-                     then Machine.x86_32_macosx
-                     else Machine.x86_32
+      | "ia32"    -> if Configuration.model = "64" then
+                       Machine.x86_64
+                     else
+                       if Configuration.abi = "macosx"
+                       then Machine.x86_32_macosx
+                       else Machine.x86_32
       | _         -> assert false
       end;
     Builtins.set C2C.builtins;