lkml.org 
[lkml]   [2020]   [Sep]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRE: [PATCH v5 1/5] x86/asm: Carve out a generic movdir64b() helper for general usage
Date
> > No, that just says the asm uses the value of the pointer.
> > Not what it points to.
>
> Err, no, it is *exactly* what it points to that is important here and
> you're telling the compiler that the instruction will read that much
> memory through the pointer.

You need to use an "m" constraint for that.
A 'register' constraint just requires the value of the address
to be valid.

Look at the asm output from the example code I posted.

David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
\
 
 \ /
  Last update: 2020-09-24 13:26    [W:0.049 / U:0.628 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site