Possible bug in softfloat

[Julian Elischer]

On 11/29/14, 4:59 AM, Adrian Chadd wrote:
> You can easily fire up a mips32 / mips64 emulator build - cross-build
> a world+kernel, build an image, then run qemu-devel to boot it.
>
> https://wiki.freebsd.org/FreeBSD/MipsEmulation
>
> You should be able to get a 32 bit soft-float mips environment inside
> there which you can use to trigger it.
> (And also run whatever other floating point validation suite you may hvae.)

I suspect this is one for bde to look at.

>
>
>
> -adrian
>
>
> On 28 November 2014 at 11:07, Steve Kargl
> <sgk at troutmask.apl.washington.edu> wrote:
>> On Fri, Nov 28, 2014 at 10:54:25AM -0800, Adrian Chadd wrote:
>>> On 28 November 2014 at 10:34, Steve Kargl
>>> <sgk at troutmask.apl.washington.edu> wrote:
>>>> In a thread on comp.lang.c, it was pointed out that softfloat
>>>> has a bug and in checking src/lib/libc/softfloat I confimed
>>>> the issue is present in FreeBSD.  What I hae not confirmed
>>>> is whether or not it is possible to hit this bug.  In fact,
>>>> it may only hit arm and mips.  Anyway, here's the patch
>>> So we should just commit this?
>>>
>> I suspect the answer is yes, but I have no idea on how
>> to trigger this code path.  I also have no access to
>> arm or mips hardware where the problem may manifest only.
>>
>> It may also be appropriate to have someone else confirm
>> that the patch is indeed correct.
>>
>> --
>> steve
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