[Octave-patch-tracker] [patch #10020] Improve xpow and bsxfun_pow performance

[Shan Kang]

URL:
  <https://savannah.gnu.org/patch/?10020>

                 Summary: Improve xpow and bsxfun_pow performance
                 Project: GNU Octave
            Submitted by: kangshan0910
            Submitted on: Tue 02 Feb 2021 12:47:44 PM UTC
                Category: Forge : other
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any

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Details:

1. xpow_optimizaton.patch: it uses https://github.com/intel/VML to improve the
xpow functions for non complex data type. Test shows that the larger the array
size, the more improvement it can get. When array size is 128, the performance
of those updated functions can be increased more than 2 times.

2. bsxfun_pow_optimizaton.patch: it is on the basis of the above patch.
Originally we didn't plan to improve these bsxfun_pow functions. But VML uses
those vectorized math functions from libmvec of which the precision is lower
than libm and this will lead bsxfun.cc-tst to fail. So we implement this
patch. With this patch, when array size is 128, the performance of those
updated functions can be increased more than 20%. The larger the array size,
the more improvement it can get. However, when the array size is less than 16,
the performance will drop ~10%. So if bsxfun.cc-tst's failure is OK, we
recommend the first patch, as it has no side effect.



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File Attachments:


-------------------------------------------------------
Date: Tue 02 Feb 2021 12:47:44 PM UTC  Name: xpow_optimizaton.patch  Size:
6KiB   By: kangshan0910

<http://savannah.gnu.org/patch/download.php?file_id=50822>
-------------------------------------------------------
Date: Tue 02 Feb 2021 12:47:44 PM UTC  Name: bsxfun_pow_optimizaton.patch 
Size: 12KiB   By: kangshan0910

<http://savannah.gnu.org/patch/download.php?file_id=50823>

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