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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/98519] rs6000: @pcrel unsupported on this instruction
 error in pveclib
Date: Sat, 23 Jan 2021 23:48:14 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98519

--- Comment #20 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Alan Modra from comment #18)
> Isn't this a bug in the assembly?  We've changed the ABI, there is no way
> anyone can expect all old asm to work with power10 pcrel.  To support pcr=
el
> you need new asm.
>=20
> #ifdef __PCREL__
> __asm__ (pcrel version);
> #else
> __asm__ (non-pcrel version);
> #endif
>=20
> No need for special constraints, I think.  (And not sufficient if we had
> them.)

I agree with Segher that we can't state that all old inline asm that uses "=
m"
is buggy if/when compiled with -mcpu=3Dpower10.  There's just way too much =
use of
it.

That said, I'm interested in why you don't think a new special pcrel constr=
aint
would be sufficient?=