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Re: 4.0-rc1 breakage in FPE?

To: Måns Rullgård <mans@mansr.com>
Subject: Re: 4.0-rc1 breakage in FPE?
From: David Daney <ddaney.cavm@gmail.com>
Date: Wed, 25 Feb 2015 13:40:04 -0800
Cc: Paul Martin <paul.martin@codethink.co.uk>, linux-mips@linux-mips.org
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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


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