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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/98519] rs6000: @pcrel unsupported on this instruction
 error in pveclib
Date: Mon, 10 Oct 2022 16:00:02 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98519

--- Comment #32 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Peter Bergner from comment #31)
> (In reply to Segher Boessenkool from comment #30)
> > We have to disallow all (*all*) operands that require prefixed insns, u=
ntil
> > we can handle those properly.
>=20
> So if we can't disallow pcrel addresses in asm operands in=20
> rs6000_legitimate_address_p, then where can we disallow them when they're
> used with all of the current memory constraints?  Ie, not the new pcrel
> address friendly constraint we don't have yet?

Maybe we can do something like

  "m!"(xx)

to mean prefixed addressing is allowed.  This would be handled adjacent to
where we handle "m<>" already (in recog.cc mostly).=