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, 3 insertions, 2 deletions

diff --git a/Makefile b/Makefile
index 2d16da42..067e54d2 100644
--- a/Makefile
+++ b/Makefile
@@ -65,8 +65,9 @@ COMMON=Errors.v AST.v Linking.v \
 
 BACKEND=\
   Cminor.v Op.v CminorSel.v \
-  SelectOp.v SelectDiv.v SelectLong.v Selection.v \
-  SelectOpproof.v SelectDivproof.v SelectLongproof.v Selectionproof.v \
+  SelectOp.v SelectDiv.v SplitLong.v SelectLong.v Selection.v \
+  SelectOpproof.v SelectDivproof.v SplitLongproof.v \
+  SelectLongproof.v Selectionproof.v \
   Registers.v RTL.v \
   RTLgen.v RTLgenspec.v RTLgenproof.v \
   Tailcall.v Tailcallproof.v \