bdiv vs redc

Torbjorn Granlund tg at
Tue Jul 3 18:01:33 CEST 2012

nisse at (Niels Möller) writes:

  > Could you perhaps write a new proposed sbpi1_bdiv_qr with the result
  > normalisation you suggest, using my proposed sbpi1_bdiv_r style?  That
  > would allow for a single outer loop, unlike the current sbpi1_bdiv_qr.
  Below. I'm also attaching a larger patch which also updates
  sbpi1_bdiv_q, the dc code, the t-bdiv testcode, and some of the bdiv
  callers (divexact and remove). I haven't touched the mu_bdiv code.
I looked at the patch briefly, and it looks good to me.

  I get lots of failures, I guess some but not all are caused by mu_bdiv
  following the old rather than the new convention (I tried setting the
  MU_BDIV thresholds to infinity, and I still have lots of failures.).

Have you checked that e.g. sbpi1_bdiv_qr gets N = QD+R?


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