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Added release notes for the Mips target.

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llvm-svn: 225607
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Daniel Sanders 2015-01-11 10:34:52 +00:00
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@ -111,7 +111,74 @@ Changes to the ARM Backend
Changes to the MIPS Target
--------------------------
During this release ...
During this release the MIPS target has reached a few major milestones. It has
gained support for MIPS-II and MIPS-III, become ABI-compatible with GCC for big
and little endian O32, N32, and N64, and we are now able to compile the Linux
kernel for 32-bit targets.
ABI
^^^
A large number of bugs have been fixed for big-endian MIPS targets using the
N32 and N64 ABI's as well as a small number of bugs affecting other ABI's.
Please note that some of these bugs will still affect LLVM-IR generated by
LLVM 3.5 since correct code generation depends on appropriate usage of the
``inreg``, ``signext``, and ``zeroext`` attributes on all function arguments
and returns.
There are far too many corrections to provide a complete list but here are a
few notable ones:
* Big-endian N32 and N64 now interlinks successfully with GCC compiled code.
Previously this didn't work for the majority of cases.
* The registers used to return a structure containing a single 128-bit floating
point member on the N32/N64 ABI's have been changed from those specified by
the ABI documentation to match those used by GCC. The documentation specifies
that ``$f0`` and ``$f2`` should be used but GCC has used ``$f0`` and ``$f1``
for many years.
* Returning a zero-byte struct no longer causes arguments to be read from the
wrong registers when using the O32 ABI.
* The exception personality has been changed for 64-bit MIPS targets to
eliminate warnings about relocations in a read-only section.
* Incorrect usage of odd-numbered single-precision floating point registers
has been fixed when the fastcc calling convention is used with 64-bit FPU's
and -mno-odd-spreg.
LLVMLinux
^^^^^^^^^
It is now possible to compile the Linux kernel. This currently requires a small
number of kernel patches. See the `LLVMLinux project
<http://llvm.linuxfoundation.org/index.php/Main_Page>`_ for details.
* Added -mabicalls and -mno-abicalls. The implementation may not be complete
but works sufficiently well for the Linux kernel.
* Fixed multiple compatibility issues between LLVM's inline assembly support
and GCC's.
* Added support for a number of directives used by Linux to the Integrated
Assembler.
Miscellaneous
^^^^^^^^^^^^^
* Attempting to disassemble l[wd]c[23], s[wd]c[23], cache, and pref no longer
triggers an assertion.
* Added -muclibc and -mglibc to support toolchains that provide both uClibC and
GLibC.
* __SIZEOF_INT128__ is no longer defined for 64-bit targets since 128-bit
integers do not work at this time for this target.
* Using $t4-$t7 with the N32 and N64 ABI is deprecated when ``-fintegrated-as``
is in use and will be removed in LLVM 3.7. These names have never been
supported by the GNU Assembler for these ABI's.
Changes to the PowerPC Target
-----------------------------