From: Eric Botcazou <ebotcazou@adacore.com>
To: Peter Bergner <bergner@vnet.ibm.com>
Cc: gcc@gcc.gnu.org, Jeff Law <law@redhat.com>,
Vladimir N Makarov <vmakarov@redhat.com>,
Pat Haugen <pthaugen@linux.vnet.ibm.com>
Subject: Re: Why does IRA force all pseudos live across a setjmp call to be spilled?
Date: Sun, 04 Mar 2018 13:57:00 -0000 [thread overview]
Message-ID: <3378914.kM1GF4J5QF@polaris> (raw)
In-Reply-To: <f2edc1b8-c14f-4670-cb86-0a8aace93077@vnet.ibm.com>
> I can't argue with anything in that comment, other than the conclusion. :-)
> It's not the compiler's job to implement the setjmp/longjmp save/restore.
> Maybe Kenny was working around a problem with some target's buggy setjmp
> and spilling everything "fixed" it?
What are the requirements imposed on setjmp exactly and by whom? The psABI on
SPARC (the SCD) has an explicit note saying that setjmp/sigsetjmp/vfork don't
(have to) preserve the usual non-volatile registers.
--
Eric Botcazou
next prev parent reply other threads:[~2018-03-04 13:57 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-02 19:45 Peter Bergner
2018-03-02 19:55 ` Alexander Monakov
2018-03-02 21:26 ` Jeff Law
2018-03-03 3:28 ` Peter Bergner
2018-03-03 16:29 ` Jeff Law
2018-03-03 23:47 ` Peter Bergner
2018-03-04 0:30 ` Peter Bergner
2018-03-04 8:57 ` Richard Biener
2018-03-04 9:11 ` Andreas Schwab
2018-03-05 2:12 ` Jeff Law
2018-03-04 13:57 ` Eric Botcazou [this message]
2018-03-04 16:40 ` Peter Bergner
2018-03-04 17:39 ` Andreas Schwab
2018-03-05 0:16 ` Segher Boessenkool
2018-03-05 7:01 ` Eric Botcazou
2018-03-05 7:09 ` Eric Botcazou
2018-03-05 15:33 ` Segher Boessenkool
2018-03-05 16:18 ` Eric Botcazou
2018-03-06 16:20 ` Peter Bergner
2018-03-03 3:21 ` Vladimir Makarov
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