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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/106895] powerpc64 unable to specify even/odd register
 pairs in extended inline asm
Date: Mon, 03 Jul 2023 15:45:52 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106895

--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Segher Boessenkool from comment #5)
> Constraints are completely the wrong tool for this.  Just use modes, which
> *are* the right tool?

Well you cannot specify modes in the asm, so I think you're saying we need =
use
the correct type that maps to a internal to GCC mode that has the even/odd
register behavior, so something like:

  unsigned int foo __attribute__ ((mode (XX)));

...where XXmode is the new integer mode that gives us even/odd register pai=
rs?=20
Of course we have to be careful about how this all works wrt -m32 versus -m=
64.=