On Thu, 28 May 2015, James Cowgill wrote:
> Your test case is wrong. If compiled without optimization, GCC call
> 'sqrt' from glibc instead of using the sqrt.s MIPS instruction. With
> optimization GCC will remove the call altogether. This is different to
> fortran because in fortran SQRT is a bui
On Wed, 27 May 2015, Ole Streicher wrote:
> > If you suspect a bug in emulation, then please try narrowing it down to
> > the machine instruction that produces the wrong result, you might be able
> > to track it down in your Fortran program by single-stepping the program in
> > GDB.
>
> Sorr
On Wed, 27 May 2015, Ole Streicher wrote:
> It is something specific what gfortran produces (and not gcc), and it is not
> just a missing emulation (since normalized numbers work); it may be an
> incomplete emulation.
If you suspect a bug in emulation, then please try narrowing it down to
the m
On Wed, 27 May 2015, James Cowgill wrote:
> > > Commit 2d83fea786d7 in 4.1-rc1 ('MIPS: Correct FP ISA requirements')
> > > fixed the underlying sqrt.s emulation bug.
> > >
> > > It would be good if the 4.1-rc1 patch or at least the 'case fsqrt_op'
> > > part (which is the fix for this bug) can be
On Wed, 27 May 2015, James Cowgill wrote:
> Thanks! The kernel was the important part which was different to my
> setup.
>
> There's probably still a hardware bug in here somewhere, but before 3.16
> the kernel was fixing it with the math emulator.
>
> From what I can see:
> Commit 08a07904e182
On Wed, 25 Feb 2009, Ralf Baechle wrote:
> > > You're getting this error message for the attempt to run a 64-bit kernel
> > > on certain very old R4000 revisions. So either run a 32-bit kernel,
> > > switch to newer version of the R4000 or to another MIPS CPU. For a
> > > processor with just 8k
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