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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

CPragmas (PPC/EABI only): add #pragma reserve_register


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


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- wrong simplification of && and || in the Set case
- generated nicer code for && and || in the Eval case


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Include targets of preference edges in all_interf_regs.  Not needed for correctness, but this way temporaries that have preferences but no interferences do not fall in the default case of Coloring.alloc_of_coloring.  This used to create uncoalesced moves esp. on Arm.


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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.


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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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