llvm dev - May 2016 - Integrated Assembler is now the default for mips-* and mipsel-* triples.

Hi,

I'm pleased to announce that the MIPS integrated assembler is now good
enough
to recurse the compiler for MIPS32R2, build a bootable Linux kernel for
MIPS32R2, and pass LNT testing for a variety of 32-bit MIPS targets. I've
therefore enabled it by default for all 32-bit MIPS targets in both LLVM and
Clang.

We're not aiming for perfect GAS compatibility but you should find that the
commonly used functionality works as expected.

If you run into problems with it then please file a bug report and use
-fno-integrated-as while it's being fixed. The plan is to fix any remaining
issues as we discover them but we may fall back on reverting temporarily if too
much breaks.

We had to leave 64-bit MIPS targets using an external assembler for the moment
since the integrated assembler has a number of issues with the N32 ABI which
also prevents us making the switch for the N64 ABI because the relevant code
cannot distinguish N32 from N64. Hopefully we'll be able to make the switch
for
those targets in the near future.

Thanks to everyone who made this possible.

Daniel Sanders
Leading Software Design Engineer, MIPS Processor IP
Imagination Technologies Limited
http://www.imgtec.com/

Congratulations and thanks!

Cheers,
Rafael


On 14 May 2016 at 12:33, Daniel Sanders via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> Hi,
>
> I'm pleased to announce that the MIPS integrated assembler is now good
enough
> to recurse the compiler for MIPS32R2, build a bootable Linux kernel for
> MIPS32R2, and pass LNT testing for a variety of 32-bit MIPS targets.
I've
> therefore enabled it by default for all 32-bit MIPS targets in both LLVM
and
> Clang.
>
> We're not aiming for perfect GAS compatibility but you should find that
the
> commonly used functionality works as expected.
>
> If you run into problems with it then please file a bug report and use
> -fno-integrated-as while it's being fixed. The plan is to fix any
remaining
> issues as we discover them but we may fall back on reverting temporarily if
too
> much breaks.
>
> We had to leave 64-bit MIPS targets using an external assembler for the
moment
> since the integrated assembler has a number of issues with the N32 ABI
which
> also prevents us making the switch for the N64 ABI because the relevant
code
> cannot distinguish N32 from N64. Hopefully we'll be able to make the
switch for
> those targets in the near future.
>
> Thanks to everyone who made this possible.
>
> Daniel Sanders
> Leading Software Design Engineer, MIPS Processor IP
> Imagination Technologies Limited
> http://www.imgtec.com/
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

On 14 May 2016 at 17:33, Daniel Sanders via llvm-dev
<llvm-dev at lists.llvm.org> wrote:
> I'm pleased to announce that the MIPS integrated assembler is now good
enough
> to recurse the compiler for MIPS32R2, build a bootable Linux kernel for
> MIPS32R2, and pass LNT testing for a variety of 32-bit MIPS targets.
I've
> therefore enabled it by default for all 32-bit MIPS targets in both LLVM
and
> Clang.
Success!!! :D

Congratulations to every one, this is a major step forward!

cheers,
--renato

On 16 May 2016, at 15:46, Renato Golin via llvm-dev <llvm-dev at
lists.llvm.org> wrote:
> 
> On 14 May 2016 at 17:33, Daniel Sanders via llvm-dev
> <llvm-dev at lists.llvm.org> wrote:
>> I'm pleased to announce that the MIPS integrated assembler is now
good enough
>> to recurse the compiler for MIPS32R2, build a bootable Linux kernel for
>> MIPS32R2, and pass LNT testing for a variety of 32-bit MIPS targets.
I've
>> therefore enabled it by default for all 32-bit MIPS targets in both
LLVM and
>> Clang.
> 
> Success!!! :D
> 
> Congratulations to every one, this is a major step forward!
Indeed.  We still have a few patches needed to be able to handle the n64
assembly in the FreeBSD kernel and to fix the position-dependent relocations,
but with those applied we can compile FreeBSD/MIPS64 (MIPS III) with LLVM /
Clang.

David