Re: state of the ports

[Xi Ruoyao <xry111@xry111.site>]

On Fri, 2024-02-02 at 15:51 +0800, Xi Ruoyao wrote:
> On Fri, 2024-02-02 at 03:35 +0100, Andreas K. Huettel wrote:
> > mips (n64)
> >  - mostly math failures
> 
> They are some sort of 2 ulp vs expected 1 ulp things.  I'm not yet sure
> if they are hardware issues or Glibc bugs.

Something like:

testing double (without inline functions)
Failure: Test: j0 (0x4.130e7p+4)
Result:
 is:         -1.0474906594151864e-04  -0x1.b759740016860p-14
 should be:  -1.0474906594151868e-04  -0x1.b759740016863p-14
 difference:  4.0657581468206416e-20   0x1.8000000000000p-65
 ulp       :  3.0000
 max.ulp   :  2.0000
Maximal error of `j0'
 is      : 3 ulp
 accepted: 2 ulp
Failure: Test: j0_downward (0xa.5b833p+4)
Result:
 is:          1.4785400727226293e-05   0x1.f01da00ab51d1p-17
 should be:   1.4785400727226283e-05   0x1.f01da00ab51cbp-17
 difference:  1.0164395367051604e-20   0x1.8000000000000p-67
 ulp       :  6.0000
 max.ulp   :  5.0000
Maximal error of `j0_downward'
 is      : 6 ulp
 accepted: 5 ulp
Failure: Test: j0_towardzero (0xa.5b833p+4)
Result:
 is:          1.4785400727226271e-05   0x1.f01da00ab51c4p-17
 should be:   1.4785400727226283e-05   0x1.f01da00ab51cbp-17
 difference:  1.1858461261560204e-20   0x1.c000000000000p-67
 ulp       :  7.0000
 max.ulp   :  6.0000
Maximal error of `j0_towardzero'
 is      : 7 ulp
 accepted: 6 ulp

Test suite completed:
  212 test cases plus 208 tests for exception flags and
    208 tests for errno executed.
  6 errors occurred.

I'm really not an expert in numerical analysis.  Any pointer to debug
such a thing further?

-- 
Xi Ruoyao <xry111@xry111.site>
School of Aerospace Science and Technology, Xidian University