[prev in list] [next in list] [prev in thread] [next in thread] 

List:       openembedded-core
Subject:    [OE-core] Tune files and knobs to turn
From:       pb () pbcl ! net (Phil Blundell)
Date:       2011-06-30 17:58:26
Message-ID: 1309456706.3106.62.camel () lenovo ! internal ! reciva ! com
[Download RAW message or body]

On Thu, 2011-06-30 at 19:41 +0200, Koen Kooi wrote:
> Real world experience with gcc 4.3 and 4.5 has shown that gcc is
> shockingly bad at vectorizing for NEON, so you need this unbreak-me
> option to avoid slowdowns. It might be less bad on cortex-a9 or a15,
> but for A8 not vectorizing is a net win.

What does it do wrong?  I'm slightly surprised that not making any
attempt to vectorize at all is better than trying to vectorize and not
doing very well at it.

p.





[prev in list] [next in list] [prev in thread] [next in thread]