git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1346 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

- Revised handling of volatile reads: the execution environment
  dictates the value read, via the trace of events.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1345 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

wrong because of +0.0 / -0.0.  
Adapted Clight semantics accordingly.  (Truth value of a float is
defined by comparison Float.cmp Ceq with 0.0, no longer by structural
equality.)


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1342 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

Minor updates on ARM code generator.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1339 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

Finished proof of chunktype_compat, which was incomplete.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1335 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1285 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1282 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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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

git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1266 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1235 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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



git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1182 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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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.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1136 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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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.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1124 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e

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.


git-svn-id: https://yquem.inria.fr/compcert/svn/compcert/trunk@1018 fca1b0fc-160b-0410-b1d3-a4f43f01ea2e