Clight and C#minor.  Recognize __builtin_fabs and turn it into this operator.


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- added __builtin_trap()
- generate .size and .type directives
- use natural alignment for variables


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1315 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

Algorithmic efficiency: in cparser/, precompute sizeof and alignof of composites.
Code cleanup: introduced Cutil.composite_info_{def,decl}


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Added support for processor-specific builtin functions.
Added some PowerPC instructions as builtins.
Updated #pragma section handling.


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PrintCsyntax, PrintAsm: improve printing of float literals.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1284 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

- 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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Function types didn't always degrade to pointers like they should.  Introduced and used Csyntax.typeconv to address this issue and reduce the number of cases in the classify functions

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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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  #pragma use_section.
Some clean-ups in Cil2Csyntax.
Separate mach-dep parts of extraction/extraction.v into
   <arch>/extractionMachdep.v


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all x used as destination of a call [x = f(args)].  This wasn't true before
if x was a global C#minor variable.


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Kildall: simplified the interface
Constprop, CSE, Allocation, Linearize: updated for the new Kildall
RTL, LTL: removed the well-formedness condition on the CFG, 
  it is no longer necessary with the new Kildall and it is problematic
  for validated optimizations.
Maps: more efficient implementation of PTree.fold.


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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.


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Put "const" globals in read-only section.
Revised printing of rlwinm instruction.


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Conflict between extraction/CList and cil/obj/xxx/clist on case-insensitive file systems.  Replaced CList by CoqList and likewise for CString and CInt.  Removed useless references to CList in hand-written Caml code.

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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.


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


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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

caml/PrintCsyntax.ml: afficher les formes a[b] et a->fld.



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