[cfe-commits] r170125 - /cfe/trunk/lib/Basic/Targets.cpp

[Eli Friedman]

On Thu, Dec 20, 2012 at 1:06 AM, Benyei, Guy <guy.benyei at intel.com> wrote:
> Hi Eli,
>
> From the LLVM Language Reference Manual:
>
> " When constructing the data layout for a given target, LLVM starts with a default set of specifications which are then (possibly) overridden by the specifications in the datalayout keyword. The default specifications are given in this list:
>
> E - big endian..."
>
> It seems to me, that the default big endian is taken even if I don't define a data layout, and the rest of the data is still relevant.
> I'm not sure how to handle this, from the SPIR point of view it's possible to completely ignore the issue by declaring that the default endian in SPIR is neither little nor big, and this IR is still strong enough to work. Another solution would be to introduce a new notation for "unknown" endian.
>
> Any other ideas on this issue?

>From later in that section of LangRef: "If you would like to generate
IR that does not embed this target-specific detail into the IR, then
you don’t have to specify the string."

-Eli