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From: Patrick McGehearty <patrick.mcgehearty@oracle.com>
To: libc-alpha@sourceware.org
Subject: Re: [PATCH] improves exp() and expf() performance on Sparc.
Date: Wed, 06 Sep 2017 20:31:00 -0000	[thread overview]
Message-ID: <f1b16668-b50e-48c0-14e6-730a7b084b02@oracle.com> (raw)
In-Reply-To: <59AD3C67.3070203@arm.com>

On 9/4/2017 6:43 AM, Szabolcs Nagy wrote:
> On 01/09/17 23:59, Patrick McGehearty wrote:
>> --- /dev/null
>> +++ b/sysdeps/sparc/fpu/libm_endian.h
> is this header useful?
>
>> +#define	XBIASED_EXP(x)	((((int *)&x)[HIXWORD] & 0x7fffffff) >> 16)
>> +#define	ISZEROL(x)	(((((int *)&x)[0] & ~XSGNMSK) | ((int *)&x)[1] | \
>> +				((int *)&x)[2] | ((int *)&x)[3]) == 0)
> i don't see these used and such aliasing violation
> is not acceptable anyway.
>
These definitions are not used in the new exp routines.
I will remove them from my next submission as well as HIXWORD and XSGNMSK.
If later porting of other math routines suggests
they might be useful, we can discuss what to do at that time.

- patrick

  reply	other threads:[~2017-09-06 20:31 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-01 22:59 Patrick McGehearty
2017-09-01 23:14 ` Joseph Myers
2017-09-06 20:34   ` Patrick McGehearty
2017-09-06 21:01     ` Joseph Myers
2017-09-07 20:42       ` Patrick McGehearty
2017-09-07 21:05         ` Joseph Myers
2017-09-07 23:53           ` Patrick McGehearty
2017-09-04 11:43 ` Szabolcs Nagy
2017-09-06 20:31   ` Patrick McGehearty [this message]
2017-09-11 18:50 Wilco Dijkstra

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