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Date: Tue, 11 Jul 2023 15:21:53 +0200
From: Jan Hubicka <hubicka@ucw.cz>
To: Richard Biener <richard.guenther@gmail.com>
Cc: Alexander Monakov <amonakov@ispras.ru>, Michael Matz <matz@suse.de>,
	gcc-patches@gcc.gnu.org
Subject: Re: [x86-64] RFC: Add nosse abi attribute
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> > > When a function doesn't contain calls to
> > > unknown functions we can be a bit more lenient: we can make it so that
> > > GCC simply doesn't touch xmm8-15 at all, then no save/restore is
> > > necessary.

One may also take into account that first 8 registers are cheaper to
encode than the later 8, so perhaps we may want to choose range that
contains both.

Honza