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Date: Tue, 11 Jul 2023 10:53:18 +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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References: <alpine.LSU.2.20.2307101549210.13548@wotan.suse.de>
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> > > FWIW, this particular patch was regstrapped on x86-64-linux
> > > with trunk from a week ago (and sniff-tested on current trunk).
> >
> > This looks really cool.
> 
> The biggest benefit might be from IPA with LTO where we'd carefully place those
> attributes at WPA time (at that time tieing our hands for later).

Within single partition IRA already propagates the knowledge about
callee-clobbered registers.

Across partition we already automatically enable regparm with -m32
see ix86_function_regparm and tests for target->local and
can_change_attribute

Enabling SSE at the same spot should be easy.

Honza