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Re: ARM wmmx instructions from gcc ?
- From: Paul Brook <paul at codesourcery dot com>
- To: danny dot backx at scarlet dot be
- Cc: gcc at gcc dot gnu dot org, Dave Korn <dave dot korn dot cygwin at googlemail dot com>
- Date: Thu, 3 Sep 2009 12:31:35 +0100
- Subject: Re: ARM wmmx instructions from gcc ?
- References: <1251657824.6106.38.camel@pavilion> <200909021334.44043.paul@codesourcery.com> <1251905870.6106.127.camel@pavilion>
> > Both. By my reading the ABI you're trying to implement does not provide
> > the guarantees required to use iwmmxt instructions. There are ways around
> > this, but none of them are simple or pretty. The simplest answer is
> > "don't do that".
>
> Hi Paul,
>
> Thanks for the answer, but I'm not sure what you've told me and why.
> Could you expand a little ?
>
> Don't do what ? Use WMMX instructions in GCC ?
> or
> Don't try to use the current implementation with WMMX ?
iwmmxt instructions require doubleword data alignment . Your target
[apparently] can't provide that. You loose.
Paul