From: Jakub Jelinek <jakub@redhat.com>
To: Jonathan Wakely <jwakely.gcc@gmail.com>
Cc: Theodore Papadopoulo <Theodore.Papadopoulo@inria.fr>,
"gcc@gcc.gnu.org" <gcc@gcc.gnu.org>
Subject: Re: Enquiry
Date: Sun, 30 Jan 2022 11:58:22 +0100 [thread overview]
Message-ID: <20220130105822.GD2646553@tucnak> (raw)
In-Reply-To: <CAH6eHdTszkXJ+F1R7H=7BVqY=usqR+e+UPShdUJ32B2zghTTmQ@mail.gmail.com>
On Sun, Jan 30, 2022 at 10:50:56AM +0000, Jonathan Wakely wrote:
> We could put a trap instruction at the end of the function though, which
> would make the result a bit less arbitrary.
>
> I've come around to thinking that's preferable for cases like this.
Depends on which exact cases.
Because for
int foo (int s) { if (s == 123) return 1; }
we want to optimize it into
return 1;
rather than if (s == 123) return 1; else __builtin_trap ();
For debugging we have -fsanitize=undefined
Jakub
next prev parent reply other threads:[~2022-01-30 10:58 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-30 9:47 Enquiry Theodore Papadopoulo
2022-01-30 10:41 ` Enquiry Jakub Jelinek
2022-01-30 10:50 ` Enquiry Jonathan Wakely
2022-01-30 10:58 ` Jakub Jelinek [this message]
2022-01-30 11:11 ` Enquiry Jonathan Wakely
2022-01-31 9:42 ` Enquiry Jakub Jelinek
2022-01-31 10:25 ` Enquiry Andreas Schwab
2022-01-31 10:33 ` Enquiry Jonathan Wakely
2022-01-31 10:16 ` Enquiry Theodore Papadopoulo
2022-01-31 10:23 ` Enquiry Jonathan Wakely
2022-01-30 11:17 ` Enquiry Jonathan Wakely
2022-01-31 9:26 ` Enquiry Theodore Papadopoulo
-- strict thread matches above, loose matches on Subject: below --
2020-09-12 23:44 Enquiry Paul
2009-06-02 13:52 Enquiry Vijay Holimath
[not found] ` <dfa53ad0906021048t7e1c1fc7pf019d1229f529592@mail.gmail.com>
[not found] ` <dfa53ad0906021050p7aa605f2m4a1b6459b7f1f89e@mail.gmail.com>
2009-06-03 10:33 ` Enquiry Vijay
2009-06-02 13:00 Enquiry Vijay Holimath
2006-09-29 13:00 ENQUIRY Dr.Richard Lovward
2000-09-21 20:26 enquiry Adarsh MP
2000-09-22 2:15 ` enquiry Erik Mouw
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