Re: [eigen] sse transcendental functions |

[ Thread Index | Date Index | More lists.tuxfamily.org/eigen Archives ]

*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] sse transcendental functions*From*: Gael Guennebaud <gael.guennebaud@xxxxxxxxx>*Date*: Wed, 25 Mar 2009 18:07:20 +0100*Dkim-signature*: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:content-type :content-transfer-encoding; bh=jm3SqWzm646NjT4wzdIw3kArKh50/rbSYnrz1yyOIQk=; b=BkIIB/BEtThPrBt4985eHmgcXFJcUswTx5iwUnkgI5lBpPe6gPFmP6LWp+u4FemK0Y nLRKrlHB8UTU07zGD7hspGyMvSSl4KZvPXbLYfIdYCyfkSnmBQbpXwOPfkdKy8SU2y4M E3N/XsLSHo5w/UdlKubnOWBgV3fLhbmitUwsk=*Domainkey-signature*: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; b=riEToHdz5PuQgSS1XSGg3VK/T5FVFKCQo5ptcpvcTyQYRtFuy4JkK3ZdQnwNDWMT4f LR8HJRon9c4uqDvBMTZeoS2AiiNT62SY1TAhFYkF0uZ+N8eEtbfuuGi7efx+v0kR1d0k DJZa7xtpsrOlu1J26oPjzAQqsojL+4HOZsV40=

ok, so this actually corresponds to the SIMD lib by Sony, and their SSE sinf4 is indeed slightly faster (200M calls versus 177M) but it is only valid in the range [-pi/4 : pi/4] so it is quite useless for us. Note that both implementations are based on exactly the same principle and the speed difference is 100% explained by the handling of a much wider range of values gael. On Wed, Mar 25, 2009 at 5:36 PM, Rohit Garg <rpg.314@xxxxxxxxx> wrote: > I'll dig them up > > > On Wed, Mar 25, 2009 at 10:06 PM, Gael Guennebaud > <gael.guennebaud@xxxxxxxxx> wrote: >> where are they ? I can only find btsin and btCos which simply call the >> standard C functions.... >> >> On Wed, Mar 25, 2009 at 3:35 PM, Rohit Garg <rpg.314@xxxxxxxxx> wrote: >>> please consider benching these against the sin, cos, acos, sincos >>> implementations in bullet physics sdk. It is bsd licensed and may be >>> faster. >>> >>> -- >>> Rohit Garg >>> >>> http://rpg-314.blogspot.com/ >>> >>> Senior Undergraduate >>> Department of Physics >>> Indian Institute of Technology >>> Bombay >>> >>> >>> >> >> >> > > > > -- > Rohit Garg > > http://rpg-314.blogspot.com/ > > Senior Undergraduate > Department of Physics > Indian Institute of Technology > Bombay > > >

**Follow-Ups**:**Re: [eigen] sse transcendental functions***From:*Rohit Garg

**References**:**[eigen] sse transcendental functions***From:*Rohit Garg

**Re: [eigen] sse transcendental functions***From:*Gael Guennebaud

**Re: [eigen] sse transcendental functions***From:*Rohit Garg

**Messages sorted by:**[ date | thread ]- Prev by Date:
**Re: [eigen] sse transcendental functions** - Next by Date:
**Re: [eigen] sse transcendental functions** - Previous by thread:
**Re: [eigen] sse transcendental functions** - Next by thread:
**Re: [eigen] sse transcendental functions**

Mail converted by MHonArc 2.6.19+ | http://listengine.tuxfamily.org/ |