llvm dev - Sep 2015 - [libunwind][Mips] Problem using gas to assemble UnwindRegistersSave.S

On 09/27/2015 06:41 PM, Vasileios Kalintiris wrote:
> Hi Richard,
>
> Clang doesn't have support for MIPS I. The trap-on-condition
instructions were added in MIPS II and they should work fine. This is why it
works with ".set mips32r2".
>
> Which version of the ISA did you specify when you used the integrated
assembler?
>
> Thanks,
> Vasileios
>
>
Hi Vasileios,

The integrated assembler works great. It was gas that complained. 
Apparently gas must default to MIPS I

-Rich

> The integrated assembler works great. It was gas that complained.
> Apparently gas must default to MIPS I
That depends on the exact toolchain you have since the default is often
overridden but the default-default is MIPS-I. Clang defaults to
MIPS32R2/MIPS64R2 depending on the triple at the moment.
> Should the integrated assembler be enabled by default for the Mips?
Not yet. There's a number of quiet mis-assembly bugs at the moment. The plan
is to switch it on once it's good enough for the Linux kernel and see what
bug reports come back.
> -----Original Message-----
> From: llvm-dev [mailto:llvm-dev-bounces at lists.llvm.org] On Behalf Of
> Richard Pennington via llvm-dev
> Sent: 28 September 2015 00:52
> To: Vasileios Kalintiris; llvm-dev at lists.llvm.org
> Subject: Re: [llvm-dev] [libunwind][Mips] Problem using gas to assemble
> UnwindRegistersSave.S
> 
> On 09/27/2015 06:41 PM, Vasileios Kalintiris wrote:
> > Hi Richard,
> >
> > Clang doesn't have support for MIPS I. The trap-on-condition
instructions
> were added in MIPS II and they should work fine. This is why it works with
> ".set mips32r2".
> >
> > Which version of the ISA did you specify when you used the integrated
> assembler?
> >
> > Thanks,
> > Vasileios
> >
> >
> Hi Vasileios,
> 
> The integrated assembler works great. It was gas that complained.
> Apparently gas must default to MIPS I
> 
> -Rich
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev

> > Should the integrated assembler be enabled by default for the Mips?
> 
> Not yet. There's a number of quiet mis-assembly bugs at the moment. The
> plan is to switch it on once it's good enough for the Linux kernel and
see what
> bug reports come back.
Having said this, we had our first successful boot of the Linux kernel build
with clang and -fintegrated-as today.