Re: state of the ports

[Xi Ruoyao <xry111@xry111.site>]

On Fri, 2024-02-02 at 22:40 +0100, Andreas K. Huettel wrote:
> Am Freitag, 2. Februar 2024, 12:28:45 CET schrieb Florian Weimer:
> > * Xi Ruoyao:
> > 
> > > 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:
> > > 
> > >  is      : 3 ulp
> > >  accepted: 2 ulp
> [..]
> > > 
> > > I'm really not an expert in numerical analysis.  Any pointer to debug
> > > such a thing further?
> 
> That looks like it can be "fixed" by regenerate-ulps, not like a real bug.
> 
> So the real number of fails is likely smaller indeed. \o/

An update on this: most of the failures were caused by my hardware:the
mips64r2 specification says FP madd should be unfused but the Loongson
hardware implements it as fused.  Passing the correct -march option to
GCC can fix them.  I'll note this in the wiki...

OTOH some ulps indeed needs an update and the updated values seem same
as the other ports using the generic math implementation (RISC-V and
LoongArch) : 

--- ../sysdeps/mips/mips64/libm-test-ulps	2024-02-23 00:56:46.428819912 +0800
+++ /home/xry111/git-repos/glibc-build/math/NewUlps	2024-02-23 00:59:29.085565020 +0800
@@ -1066,17 +1066,17 @@
 ldouble: 1
 
 Function: "j0":
-double: 2
+double: 3
 float: 9
 ldouble: 2
 
 Function: "j0_downward":
-double: 5
+double: 6
 float: 9
 ldouble: 9
 
 Function: "j0_towardzero":
-double: 6
+double: 7
 float: 9
 ldouble: 9
 
@@ -1146,6 +1146,7 @@
 ldouble: 8
 
 Function: "log":
+double: 1
 float: 1
 ldouble: 1

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