llvm dev - Oct 2016 - How to remove memcpy

On Sat, Oct 15, 2016 at 06:10:05PM -0500, Wolfgang McSneed
wrote:
> Thanks for your fast response! attached is the matrix_float.c file.
Are you intentionally not using static (& const) arrays? The compiler has
to use a copy to initialize a & b, given the size, it will use a memcpy
from a read-only section for that.

Joerg

No, there is no reason that can't be static. How do you recommend that I
define them?

THanks!

Kind Regards,

Wolf

On Sat, Oct 15, 2016 at 6:12 PM, Joerg Sonnenberger via llvm-dev <
llvm-dev at lists.llvm.org> wrote:
> On Sat, Oct 15, 2016 at 06:10:05PM -0500, Wolfgang McSneed wrote:
> > Thanks for your fast response! attached is the matrix_float.c file.
>
> Are you intentionally not using static (& const) arrays? The compiler
has
> to use a copy to initialize a & b, given the size, it will use a memcpy
> from a read-only section for that.
>
> Joerg
> _______________________________________________
> LLVM Developers mailing list
> llvm-dev at lists.llvm.org
> http://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://lists.llvm.org/pipermail/llvm-dev/attachments/20161015/1657adf4/attachment.html>

On Sat, Oct 15, 2016 at 06:18:48PM -0500, Wolfgang McSneed
wrote:
> No, there is no reason that can't be static. How do you recommend that
I
> define them?
Just make them static const, so that a & b are effectively read-only
global variables. That way, the function doesn't have to reinitialize
them all the time.

Joerg