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Message-ID: <54EE4134.2050501@gmail.com>
Date:   Wed, 25 Feb 2015 13:40:04 -0800
From:   David Daney <ddaney.cavm@gmail.com>
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CC:     Paul Martin <paul.martin@codethink.co.uk>,
        linux-mips@linux-mips.org
Subject: Re: 4.0-rc1 breakage in FPE?
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On 02/25/2015 01:31 PM, Måns Rullgård wrote:
> Paul Martin <paul.martin@codethink.co.uk> writes:
>
>> Some change between 3.19 and 4.0-rc1 has broken the FPE such that some
>> code running on an Octeon II is subtly not working.
>>

Can you say where your userspace comes from, so we can try to reproduce 
the issue?



>> eg.
>>
>>    $ echo "1 2" | gawk '{ print $1 }'
>>    1 2
>>
>> which should output (and does output on 3.19)
>>
>>    $ echo "1 2" | gawk '{ print $1 }'
>>    1
>>
>> I'm going to try bisecting this over the next few days.
>
> Are you running a 32-bit userland?  If so, enabling
> MIPS_O32_FP64_SUPPORT should fix this.

??

32-bit userland (Debian for instance) typically shouldn't need special 
"Exprimental" config options enabled.

If we can identify the offending patch, we should revert it.


David Daney