[cfe-dev] [3.7 Release] Let's fix the release notes!

[Renato Golin via cfe-dev]

Clang doesn't assume libgcc_s and libgcc_eh when you choose
--rtlib=compiler-rt on any system. Until we can all agree in the
proper way of handling this depending on the architecture / OS, users
will have to include them (or libc++abi / libunwind) manually.

On 14 August 2015 at 14:47, Ulrich Weigand via cfe-dev
<cfe-dev at lists.llvm.org> wrote:
> hwennborg at google.com wrote on 14.08.2015 01:52:59:
>
>> To update the notes, please commit directly to the 3.7 branch. If you
>> don't want to do that, just email me some text, and I'll happily land
>> it for you.
>
> I'm not sure exactly where the changes would go, but here's a list of
> notable changes on SystemZ for the LLVM / clang Release Notes:
>
> LLVM:
>
> LLVM no longer attempts to automatically detect the
> current host CPU when invoked natively.
>
> LLVM now supports all thread-local storage models on SystemZ.
> (Previous releases would support only the local-exec TLS model.)
>
> LLVM now uses the POPCNT instruction on z196 and above.
>
> LLVM now uses the RISBGN instruction on zEC12 and above.
>
> LLVN now supports the transactional-execuction facility
> on zEC12 and above.
>
> LLVM now supports the z13 processor and its vector facility.
>
>
> clang:
>
> Clang will now always default to the z10 processor when compiling
> without any -march= option.  Previous releases used to automatically
> detect the current host CPU when compiling natively.  If you wish to
> still have clang detect the current host CPU, you now need to use the
> -march=native option.
>
> Clang now provides the <s390intrin.h> header file.
>
> Clang now supports the transactional-execution facility and
> provides associated builtins and the <htmintrin.h> and
> <htmxlintrin.h> header files.  Support is enabled by default
> on zEC12 and above, and can additionally be enabled or disabled
> via the -mhtm / -mno-htm command line options.
>
> Clang now supports the vector facility.  This includes a
> change in the ABI to pass arguments and return values of
> vector types in vector registers, as well as a change in
> the default alignment of vector types.  Support is enabled
> by default on z13 and above, and can additionally be enabled
> or disabled via the -mvx / -mno-vx command line options.
>
> Clang now supports the System z vector language extension,
> providing a "vector" keyword to define vector types, and a
> set of builtins defined in the <vecintrin.h> header file.
> This can be enabled via the -fzvector command line option.
> For compatibility with GCC, Clang also supports the
> -mzvector option as an alias.
>
> Several cases of ABI incompatibility with GCC have been fixed.
>
>
> Bye,
> Ulrich
>
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