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From: "siddhesh at sourceware dot org" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug math/27461] Unixbench/whetstone-double performance regression
 on glibc2.32
Date: Wed, 24 Feb 2021 05:36:07 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D27461

Siddhesh Poyarekar <siddhesh at sourceware dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |siddhesh at sourceware dot=
 org

--- Comment #1 from Siddhesh Poyarekar <siddhesh at sourceware dot org> ---
ISTM that the core assumption when we merged _finite with regular functions=
 was
that the overhead of error checking was negligible, but that's clearly not =
true
for the whetstone benchmark.

It would be interesting to see what's different between the whetstone workl=
oad
and the ones we have in the glibc microbenchmark and find a way to harmonize
them.

FWIW, we had noticed rounding mode changing overheads were most noticeable =
in a
UnixBench benchmark (can't remember which one but it led to [1]) too compar=
ed
to others, so it's likely that the workloads there are heavy on inputs that
need more error/mode processing.


[1] commit 2506109403de69bd454de27835d42e6eb6ec3abc
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date:   Wed Jun 12 10:36:48 2013 +0530

    Set/restore rounding mode only when needed

--=20
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