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, 1 insertions, 1 deletions

diff --git a/backend/Debugvar.v b/backend/Debugvar.v
index 5d31831a..1f361030 100644
--- a/backend/Debugvar.v
+++ b/backend/Debugvar.v
@@ -136,7 +136,7 @@ Definition kill_at_call (s: avail) : avail :=
 
 Definition eq_arg (a1 a2: builtin_arg loc) : {a1=a2} + {a1<>a2}.
 Proof.
-  generalize Loc.eq ident_eq Int.eq_dec Int64.eq_dec Float.eq_dec Float32.eq_dec chunk_eq;
+  generalize Loc.eq ident_eq Int.eq_dec Int64.eq_dec Ptrofs.eq_dec Float.eq_dec Float32.eq_dec chunk_eq;
   decide equality.
 Defined.
 Global Opaque eq_arg.