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Re: avoid unnecessary register saves for setjmp

From: Andrew Haley <aph at redhat dot com>
To: "Zack Weinberg" <zack at codesourcery dot com>
Cc: <gcc-patches at gcc dot gnu dot org>
Date: Thu, 27 Nov 2003 09:45:11 +0000
Subject: Re: avoid unnecessary register saves for setjmp
References: <16325.49098.646932.196135@cuddles.cambridge.redhat.com><Pine.LNX.4.44.0311270312450.28662-100000@nondot.org><16325.49560.414002.838896@cuddles.cambridge.redhat.com><87ekvuup4s.fsf@egil.codesourcery.com>

Zack Weinberg writes:

 > So by using the EH unwinder for longjmp we clean
 > up a nasty dark corner of the language.

Do we really?  The value is still undefined according to 7.13.2.1 Para
3; all we're doing is making a gcc extension that such values are
well-defined.

Andrew.

Follow-Ups:
- Re: avoid unnecessary register saves for setjmp
  - From: Zack Weinberg

References:
- Re: avoid unnecessary register saves for setjmp
  - From: Andrew Haley
- Re: avoid unnecessary register saves for setjmp
  - From: Chris Lattner
- Re: avoid unnecessary register saves for setjmp
  - From: Andrew Haley
- Re: avoid unnecessary register saves for setjmp
  - From: Zack Weinberg

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