[llvm-dev] [3.7 Release] Let's fix the release notes!
Hans Wennborg via llvm-dev
llvm-dev at lists.llvm.org
Fri Aug 14 15:04:49 PDT 2015
On Fri, Aug 14, 2015 at 6:47 AM, Ulrich Weigand
<Ulrich.Weigand at de.ibm.com> wrote:
> 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 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.
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