| Re: [eigen] Re: Index types change pushed |
[ Thread Index |
Date Index
| More lists.tuxfamily.org/eigen Archives
]
- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] Re: Index types change pushed
- From: Benoit Jacob <jacob.benoit.1@xxxxxxxxx>
- Date: Tue, 1 Jun 2010 07:56:13 -0400
- Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:content-type; bh=5hRgDfSmpQh0hhJXQhZNz1X+Q7Kx5Ri0+tmS6WLup7o=; b=VZ+BDnYWRwUetfHwlNOzPTcS26LS529gOrOUT4VCgc3SuMY1A3mnC2NZOhhuxRBByb e7QWjm7fyMQh3GrJyDM8rQNAE14eWGwpiDCExu9kldxgqDXFApSsi+GOguKqEoi5fEAM 32+cZE2ltRglWzSurTYg4hTYih+6pk3ckLEcc=
- 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; b=GzNd1tlaZo8fad+UnmPTMr6uOZFqPUxtlYEVXvxw18BIgI4cSfAcG0rnJ0CnJxsX5W Z7HmQ0Lu21c4E0rzocpz3gF5y6StLTTCBa4d5yxd7V1sc40sY+Ju1UTUBsDUqS5VG+I+ RH9ar3p+vdhrqfxzaU5u7acf6jtoZw9LGxZ4g=
So why exactly is this helping? Is it because x86-64 is lacking
instructions to effficiently use 32bit ints as offsets? Or is it
because it's somehow helping the compiler optimize the pointer
arithmetic?
Benoit
2010/6/1 Joel Falcou <joel.falcou@xxxxxx>:
> Benoit Jacob wrote:
>>
>> Oh! No idea why, either.
>> It probably has something to do with having offsets now the of the
>> same size as pointers, but no idea exactly why this is helping.
>
> It's exactly that in fact ;)
>
>
>