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Re: PATCH: -fomit-frame-pointer and exceptions or setjmp/longjmp

From: Mark Mitchell <mark at codesourcery dot com>
To: Richard Henderson <rth at redhat dot com>, Denis Zaitsev <zzz at cd-club dot ru>
Cc: "gcc at gcc dot gnu dot org" <gcc at gcc dot gnu dot org>, Nix <nix at esperi dot demon dot co dot uk>
Date: Wed, 03 Jul 2002 14:37:15 -0700
Subject: Re: PATCH: -fomit-frame-pointer and exceptions or setjmp/longjmp
References: <20020603032930.A23158@natasha.zzz.zzz><20020602151141.A13006@redhat.com> <87fzzuc12b.fsf@amaterasu.srvr.nix><20020614052419.A6289@natasha.zzz.zzz> <87it4l8z43.fsf@amaterasu.srvr.nix><20020702050849.A13730@natasha.zzz.zzz> <20020702164555.A2299@redhat.com><20020703225500.A32583@natasha.zzz.zzz> <20020703131320.A29864@redhat.com>

--On Wednesday, July 03, 2002 01:13:20 PM -0700 Richard Henderson <rth@redhat.com> wrote:

On Wed, Jul 03, 2002 at 10:55:00PM +0600, Denis Zaitsev wrote:

While my patch cures a concrete bug...  And it is not
eh-related, its subject is bad DWARF call frame info generation.

Err..  EH uses call frame info to do it's job.  So both problems are
call frame info related.  So I miss your point.

Anyway, looking again, your patch is buggy in that it breaks
TARGET_DEEP_BRANCH_PREDICTION in exactly the opposite way as the
!TARGET_DEEP_BRANCH_PREDICTION bug you tried to fix.

Mark, I'd like to apply this simpler patch to 3.1.

OK.  Thanks for the nice simple explanation.

--
Mark Mitchell                   mark@codesourcery.com
CodeSourcery, LLC               http://www.codesourcery.com

References:
- PATCH: -fomit-frame-pointer and exceptions or setjmp/longjmp
  - From: Denis Zaitsev
- Re: PATCH: -fomit-frame-pointer and exceptions or setjmp/longjmp
  - From: Richard Henderson
- Re: PATCH: -fomit-frame-pointer and exceptions or setjmp/longjmp
  - From: Denis Zaitsev
- Re: PATCH: -fomit-frame-pointer and exceptions or setjmp/longjmp
  - From: Richard Henderson

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