Re: [PATCH v2] powerpc: slightly improve cache helpers

[Nathan Chancellor]

On Mon, Jul 08, 2019 at 11:49:52PM -0700, Nathan Chancellor wrote:
> On Tue, Jul 09, 2019 at 07:04:43AM +0200, Christophe Leroy wrote:
> > Is that a Clang bug ?
> 
> No idea, it happens with clang-8 and clang-9 though (pretty sure there
> were fixes for PowerPC in clang-8 so something before it probably won't
> work but I haven't tried).
> 
> > 
> > Do you have a disassembly of the code both with and without this patch in
> > order to compare ?
> 
> I can give you whatever disassembly you want (or I can upload the raw
> files if that is easier).
> 
> Cheers,
> Nathan

Hi Christophe and Segher,

What disassembly/files did you need to start taking a look at this? I
can upload/send whatever you need.

If it is easier, we have a self contained clang build script available
to make it easier to reproduce this on your side (does assume an x86_64
host):

https://github.com/ClangBuiltLinux/tc-build

Cheers,
Nathan