Minor updates on ARM code generator.


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- Revised memory model with concrete representation of ints & floats,
  and per-byte access permissions
- Revised Globalenvs implementation
- Matching changes in all languages and proofs.


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Introduced Int.iwordsize and used it in place of "Int.repr 32" or
"Int.repr (Z_of_nat wordsize)".



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and reactive divergence.  As a consequence:
- Removed the Enilinf constructor from traceinf (values of traceinf
  type are always infinite traces).
- Traces are now uniquely defined.
- Adapted proofs big step -> small step for Clight and Cminor accordingly.
- Strengthened results in driver/Complements accordingly.
- Added common/Determinism to collect generic results about
  deterministic semantics.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1123 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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- In Cminor and below, removed pointer validity check in semantics of 
  comparisons, so that evaluation of expressions is independent of
  memory state.
- In Cminor and below, removed "alloc" instruction.
- Cleaned up commented-away parts.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@945 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

Started to merge the ARM code generator.
Started to add support for PowerPC/EABI.
Use ocamlbuild to construct executable from Caml files.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@930 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

lib/Integers.v: added more properties for ARM port.
lib/Coqlib.v: added more properties for division and powers of 2.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@928 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

- semantiques a continuation pour Cminor et CminorSel
- goto dans Cminor

Suppression de backend/RTLbigstep.v, devenu inutile.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@692 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

Revu les comparaisons de pointeurs: == et <> sont definis entre 2 pointeurs vers des blocs differents!

git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@649 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

Introduction de l'operation intuoffloat (float -> unsigned int).  Pas encore utilisee dans le front-end C.

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Fusion de la branche restr-cminor.  En Clight, C#minor et Cminor, les expressions sont maintenant pures et les appels de fonctions sont des statements.  Ajout de semantiques coinductives pour la divergence en Clight, C#minor, Cminor.  Preuve de preservation semantique pour les programmes qui divergent.

git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@409 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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En particulier:
- Semantiques small-step depuis RTL jusqu'a PPC
- Cminor independant du processeur
- Ajout passes Selection et Reload
- Ajout des langages intermediaires CminorSel et LTLin correspondants
- Ajout des tailcalls depuis Cminor jusqu'a PPC


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Adaptation frontend, backend en consequence.
Integration passe C -> C#minor dans common/Main.v.


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