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Update documentation

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Jeffrey Walton 2018-11-24 06:04:18 -05:00
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ppc_simd.h
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@ -27,6 +27,18 @@
/// - GCC119, AIX, POWER8, GCC 7.2.0
/// - GCC119, AIX, POWER8, XLC 13.01
/// - GCC135, Linux, POWER9, GCC 7.0
/// \details 12 machines are used for testing because the three compilers form
/// five profiles. The profiles are listed below.
/// - GCC (Linux GCC, Macports GCC, etc. Consistent across machines)
/// - XLC 13.0 and earlier (all IBM components)
/// - XLC 13.1 and later on Linux (LLVM front-end, no compatibility macros)
/// - XLC 13.1 and later on Linux (LLVM front-end, -qxlcompatmacros option)
/// - LLVM Clang (traditional Clang compiler)
/// \details The LLVM front-end makes it tricky to write portable code because
/// LLVM pretends to be other compilers but cannot consume other compiler's
/// builtins. When using XLC with -qxlcompatmacros the compiler pretends to
/// be GCC, Clang and XLC all at once but it can only consume it's variety
/// of builtins.
/// \details At Crypto++ 8.0 the various VectorFunc{Name} were renamed to
/// VecFunc{Name}. For example, VectorAnd was changed to VecAnd. The name
/// change helped consolidate two slightly different implementations.