From: Wilco Dijkstra <Wilco.Dijkstra@arm.com>
To: "Paul A. Clarke" <pc@us.ibm.com>
Cc: Adhemerval Zanella <adhemerval.zanella@linaro.org>,
'GNU C Library' <libc-alpha@sourceware.org>
Subject: Re: RFC: Improve hypot performance
Date: Thu, 18 Nov 2021 12:37:24 +0000 [thread overview]
Message-ID: <VE1PR08MB55999CB894F533CB584F0769839B9@VE1PR08MB5599.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <20211117190249.GC7755@li-24c3614c-2adc-11b2-a85c-85f334518bdb.ibm.com>
Hi Paul,
> On Power10, this implementation is still has a large delta compared to the
> current implementation:
It's obvious something went wrong here since it is slower than Adhemerval's
version - did you look at the generated code?
It should use fma, and no division or function calls (if you see calls to fmin/fmax
you need to set FAST_FMINMAX to 0).
Cheers,
Wilco
next prev parent reply other threads:[~2021-11-18 12:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-17 15:58 Wilco Dijkstra
2021-11-17 19:02 ` Paul A. Clarke
2021-11-18 12:37 ` Wilco Dijkstra [this message]
2021-11-18 15:43 ` Paul A. Clarke
2021-11-18 16:15 ` Paul A. Clarke
2021-11-18 17:39 ` Wilco Dijkstra
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