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Re: [PATCH] Sparc exp(), expf() performance improvement

From: David Miller <davem at davemloft dot net>
To: patrick dot mcgehearty at oracle dot com
Cc: libc-alpha at sourceware dot org
Date: Wed, 02 Aug 2017 16:19:58 -0700 (PDT)
Subject: Re: [PATCH] Sparc exp(), expf() performance improvement
Authentication-results: sourceware.org; auth=none
References: <20170731.142137.2230165415917491707.davem@davemloft.net> <11ace70c-ca7b-b213-bc63-ac7f252ef8ba@oracle.com> <6835b045-e169-84a1-f4d6-479502a90d4b@oracle.com>

From: Patrick McGehearty <patrick.mcgehearty@oracle.com>
Date: Wed, 2 Aug 2017 14:53:19 -0500

> I concur that it would be beneficial to use -mcpu=niagara4 for
> selected libm functions, but do not believe it should be default on
> without more extensive testing (and likely more compiler tuning).

This is precisely what has been suggested, have an niagara4 IFUNC
vector for math functions that benefit greatly from the fp<-->int
register move instructions.

Follow-Ups:
- Re: [PATCH] Sparc exp(), expf() performance improvement
  - From: Patrick McGehearty

References:
- Re: [PATCH] Sparc exp(), expf() performance improvement
  - From: Patrick McGehearty
- Re: [PATCH] Sparc exp(), expf() performance improvement
  - From: Patrick McGehearty

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