Re: ATLAS 3.8.3 released

On Wed, Feb 18, 2009 at 2:07 PM, Clint Whaley <whaley@...> wrote:

Hi Clint,

> I have released 3.8.3.  This is, of course, mainly a bugfix release.
> However, I have also backported some assembly kernels from the 3.9 series
> for the Core2 and AMD64K10h architectures.  We have architectural defaults
> for these systems, as well as the new Corei7 (64 bit only).  For Core2-based
> systems, the speedup is substantial (K10h speedup is modest).

Excellent, I really like the new Core i7 kernel and the improved Core2
performance in the stable series.

> You should also be aware of one error, *which has not been fixed in 3.8.3*
>   http://math-atlas.sourceforge.net/errata.html#scal0
>
> Cheers,
> Clint

While applying my patches I was glad to see that many fixes from 3.9.x
that I used in Sage's 3.8.2 were backported. But I noticed that in
archinfo_x86.c you did not add the "case 6" for the Pentium IV models
while the missing CPU IDs for the various other missing CPUs you had
listed at the errata page were added. The "case 6" are Pentium Ds IIRC
or maybe some P IV base Extreme Edition Intel CPU IIRC.

In 3.8.3 you have:

   case Pentium4:
      switch(model)
      {
      case 0:
      case 1:
      case 2:
         iret = IntP4;
         break;
      case 3:
      case 4:
         iret = IntP4E;
         break;
      default:
         iret = MACHOther;
      }

I used to apply the following patch:

@@ -310,7 +311,7 @@
          iret = IntP4;
          break;
       case 3:
-      case 4:
+      case 4: ; case 6:
          iret = IntP4E;
          break;
       default:

Let me know if you want this in SF's bug tracker.

Keep up the good work :)

Cheers,

Michael

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