[Bug math/27461] Unixbench/whetstone-double performance regression on glibc2.32

["siddhesh at sourceware dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27461

Siddhesh Poyarekar <siddhesh at sourceware dot org> changed:

           What    |Removed                     |Added
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                 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 workload
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 compared
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

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