From: Aldy Hernandez <aldyh@redhat.com>
To: Martin Jambor <mjambor@suse.cz>, Jeff Law <law@redhat.com>
Cc: gcc-patches <gcc-patches@gcc.gnu.org>,
Andrew MacLeod <amacleod@redhat.com>
Subject: Re: std:vec for classes with constructor? (Was: Re: [patch] multi-range implementation for value_range (irange))
Date: Wed, 5 Aug 2020 17:41:01 +0200 [thread overview]
Message-ID: <c2d4b711-7a36-5845-ab00-d64807883d2e@redhat.com> (raw)
In-Reply-To: <ri6ft91m8o0.fsf@suse.cz>
On 8/5/20 5:09 PM, Martin Jambor wrote:
> On Fri, Jul 31 2020, Aldy Hernandez via Gcc-patches wrote:
>>
>
> [...]
>
>>
>> * ipa-cp changes from vec<value_range> to std::vec<value_range>.
>>
>> We are using std::vec to ensure constructors are run, which they aren't
>> in our internal vec<> implementation. Although we usually steer away
>> from using std::vec because of interactions with our GC system,
>> ipcp_param_lattices is only live within the pass and allocated with calloc.
>>
>
> Ummm... I did not object but I will save the URL of this message in the
> archive so that I can waive it in front of anyone complaining why I
> don't use our internal vec's in IPA data structures.
>
> But it actually raises a broader question: was this supposed to be an
> exception, allowed only not to complicate the irange patch further, or
> will this be generally accepted thing to do when someone wants to have a
> vector of constructed items?
I don't want to start a precedent without further discussion, so let's
assume this was an exception.
Is there another objection to std::vec<> other than it doesn't play well
with our GC? Is GCC's vec<> that much faster/efficient than std::vec<>?
Does it matter?
I will note that an alternative would have been to rewrite our
internal's vec<> implementation so that constructors are run. We
explored that, but it seemed like more work than it was worth.
Andrew, do you remember the details on the C++ness issues with GCC's
vec<> implementation?
Aldy
next prev parent reply other threads:[~2020-08-05 15:41 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-31 21:44 [patch] multi-range implementation for value_range (irange) Aldy Hernandez
2020-08-05 14:27 ` Gerald Pfeifer
2020-08-05 15:45 ` Aldy Hernandez
2020-08-05 22:43 ` Gerald Pfeifer
2020-08-06 4:00 ` Richard Sandiford
2020-08-10 3:42 ` Martin Liška
2020-08-10 7:44 ` Aldy Hernandez
2020-08-10 10:22 ` Gerald Pfeifer
2020-08-10 10:30 ` Martin Liška
2020-08-10 11:03 ` Aldy Hernandez
2020-08-05 15:09 ` std:vec for classes with constructor? (Was: Re: [patch] multi-range implementation for value_range (irange)) Martin Jambor
2020-08-05 15:41 ` Aldy Hernandez [this message]
2020-08-05 16:55 ` Richard Biener
2020-08-24 21:53 ` Jeff Law
2020-08-24 22:03 ` Andrew MacLeod
2020-08-05 16:54 ` Richard Biener
2020-08-06 1:07 ` Andrew MacLeod
2020-08-06 5:16 ` std:vec for classes with constructor? Richard Sandiford
2020-08-06 10:19 ` Jonathan Wakely
2020-08-06 10:31 ` Richard Biener
2020-08-06 10:48 ` Jonathan Wakely
2020-08-06 14:17 ` Aldy Hernandez
2020-08-06 14:35 ` Richard Biener
2020-08-06 14:59 ` Aldy Hernandez
2020-08-06 16:30 ` Jonathan Wakely
2020-08-06 17:58 ` Aldy Hernandez
2020-08-06 19:24 ` Jonathan Wakely
2020-08-07 6:48 ` Richard Biener
2020-08-07 7:57 ` Jonathan Wakely
2020-08-07 8:22 ` Richard Biener
2020-08-07 8:34 ` Jonathan Wakely
2020-08-07 8:54 ` Richard Biener
2020-08-07 8:55 ` Jakub Jelinek
2020-08-07 9:17 ` Jonathan Wakely
2020-08-07 18:04 ` Aldy Hernandez
2020-08-07 18:33 ` Jakub Jelinek
2020-08-10 12:57 ` Aldy Hernandez
2020-08-10 13:05 ` Aldy Hernandez
2020-08-10 18:03 ` Jakub Jelinek
2020-08-10 13:51 ` Jakub Jelinek
2020-08-10 16:58 ` Richard Biener
2020-08-10 17:18 ` Jakub Jelinek
2020-08-13 11:38 ` r11-2663 causes static_assert failure (was: Re: std:vec for classes with constructor?) Tobias Burnus
2020-08-13 11:52 ` Jakub Jelinek
2020-08-13 12:06 ` r11-2663 causes static_assert failure Tobias Burnus
2020-08-13 12:25 ` Jakub Jelinek
2020-08-13 12:40 ` Jakub Jelinek
2020-08-13 12:46 ` Iain Sandoe
2020-08-13 12:55 ` Iain Sandoe
2020-08-13 13:04 ` Jakub Jelinek
2020-08-13 13:00 ` Jakub Jelinek
2020-08-06 6:57 ` std:vec for classes with constructor? (Was: Re: [patch] multi-range implementation for value_range (irange)) Richard Biener
2020-08-06 10:23 ` Jonathan Wakely
2020-08-06 11:03 ` Aldy Hernandez
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