Re: Memory ordering

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Sujet : Re: Memory ordering
De : terje.mathisen (at) *nospam* tmsw.no (Terje Mathisen)
Groupes : comp.arch
Date : 06. Dec 2024, 10:04:29
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <viuemt$2895m$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
User-Agent : Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Firefox/91.0 SeaMonkey/2.53.19
Tim, did you send me a PM to check my email? I responded but then silence. Could someone be pretending to be you?
Terje
Tim Rentsch wrote:
scott@slp53.sl.home (Scott Lurndal) writes:
 
mitchalsup@aol.com (MitchAlsup1) writes:
>
On Tue, 3 Dec 2024 13:59:18 +0000, jseigh wrote:
>
The compiler is allow to reorder code as long as it knows the
reordering can't be observed or detected.
>
With exceptions enabled, this would allow for almost no code
movement at all.
>
                                           If there are places
in the code it doesn't know this can't happen it won't optimize
across it, more or less.
>
The problem is HOW to TELL the COMPILER that these memory references
are "more special" than normal--when languages give few mechanisms.
>
C and C++ have the 'volatile' keyword for this purpose.
 A problem with using volatile is that volatile doesn't do what
most people think it does, especially with respect to what
reordering is or is not allowed.
 
--
- <Terje.Mathisen at tmsw.no>
"almost all programming can be viewed as an exercise in caching"

Date Sujet#  Auteur
28 Oct 24 * Arm ldaxr / stxr loop question135jseigh
31 Oct 24 +- Re: Arm ldaxr / stxr loop question1MitchAlsup1
31 Oct 24 +- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
1 Nov 24 +* Re: Arm ldaxr / stxr loop question123aph
2 Nov 24 i`* Re: Arm ldaxr / stxr loop question122Chris M. Thomasson
8 Nov 24 i `* Re: Arm ldaxr / stxr loop question121Chris M. Thomasson
9 Nov 24 i  `* Re: Arm ldaxr / stxr loop question120Chris M. Thomasson
9 Nov 24 i   +* Re: Arm ldaxr / stxr loop question117Chris M. Thomasson
9 Nov 24 i   i+- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
11 Nov 24 i   i+* Re: Arm ldaxr / stxr loop question5MitchAlsup1
11 Nov 24 i   ii+- Re: Arm ldaxr / stxr loop question1Michael S
11 Nov 24 i   ii`* Re: Arm ldaxr / stxr loop question3jseigh
11 Nov 24 i   ii `* Re: Arm ldaxr / stxr loop question2Chris M. Thomasson
13 Nov 24 i   ii  `- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
11 Nov 24 i   i+- Re: Arm ldaxr / stxr loop question1Michael S
12 Nov 24 i   i+- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
12 Nov 24 i   i+* Re: Arm ldaxr / stxr loop question22aph
13 Nov 24 i   ii+* Re: Arm ldaxr / stxr loop question18Chris M. Thomasson
13 Nov 24 i   iii`* Re: Arm ldaxr / stxr loop question17aph
13 Nov 24 i   iii +* Re: Arm ldaxr / stxr loop question3jseigh
13 Nov 24 i   iii i`* Re: Arm ldaxr / stxr loop question2aph
13 Nov 24 i   iii i `- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
13 Nov 24 i   iii +- Re: Arm ldaxr / stxr loop question1MitchAlsup1
13 Nov 24 i   iii +* Re: Arm ldaxr / stxr loop question2Chris M. Thomasson
13 Nov 24 i   iii i`- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
13 Nov 24 i   iii +* Re: Arm ldaxr / stxr loop question2Chris M. Thomasson
13 Nov 24 i   iii i`- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
13 Nov 24 i   iii `* Re: Arm ldaxr / stxr loop question8Terje Mathisen
13 Nov 24 i   iii  +* Brilliance (was: Arm ldaxr / stxr loop question)4Anton Ertl
13 Nov 24 i   iii  i+- Re: Brilliance1BGB
14 Nov 24 i   iii  i`* Re: Brilliance2Terje Mathisen
17 Nov 24 i   iii  i `- Re: Brilliance1Thomas Koenig
13 Nov 24 i   iii  `* Re: Arm ldaxr / stxr loop question3aph
14 Nov 24 i   iii   `* Re: Arm ldaxr / stxr loop question2Terje Mathisen
15 Nov 24 i   iii    `- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
13 Nov 24 i   ii`* Re: Arm ldaxr / stxr loop question3BGB
13 Nov 24 i   ii `* Re: Arm ldaxr / stxr loop question2Chris M. Thomasson
13 Nov 24 i   ii  `- Re: Arm ldaxr / stxr loop question1Robert Finch
14 Nov 24 i   i`* Re: Arm ldaxr / stxr loop question86Kent Dickey
14 Nov 24 i   i `* Re: Arm ldaxr / stxr loop question85aph
15 Nov 24 i   i  +* Re: Arm ldaxr / stxr loop question81Chris M. Thomasson
15 Nov 24 i   i  i`* Re: Arm ldaxr / stxr loop question80aph
15 Nov 24 i   i  i +- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson
15 Nov 24 i   i  i `* Memory ordering (was: Arm ldaxr / stxr loop question)78Anton Ertl
15 Nov 24 i   i  i  +* Re: Memory ordering44Chris M. Thomasson
15 Nov 24 i   i  i  i`* Re: Memory ordering43Michael S
15 Nov 24 i   i  i  i `* Re: Memory ordering42Chris M. Thomasson
16 Nov 24 i   i  i  i  `* Re: Memory ordering41Chris M. Thomasson
16 Nov 24 i   i  i  i   +- Re: Memory ordering1Chris M. Thomasson
17 Nov 24 i   i  i  i   `* Re: Memory ordering39jseigh
17 Nov 24 i   i  i  i    +* Re: Memory ordering33Anton Ertl
19 Nov 24 i   i  i  i    i`* Re: Memory ordering32Chris M. Thomasson
3 Dec 24 i   i  i  i    i `* Re: Memory ordering31Anton Ertl
3 Dec 24 i   i  i  i    i  `* Re: Memory ordering30jseigh
3 Dec 24 i   i  i  i    i   `* Re: Memory ordering29MitchAlsup1
4 Dec 24 i   i  i  i    i    +* Re: Memory ordering22Stefan Monnier
4 Dec 24 i   i  i  i    i    i+* Re: Memory ordering3MitchAlsup1
4 Dec 24 i   i  i  i    i    ii`* Re: Memory ordering2Stefan Monnier
4 Dec 24 i   i  i  i    i    ii `- Re: Memory ordering1MitchAlsup1
4 Dec 24 i   i  i  i    i    i`* Re: Memory ordering18jseigh
5 Dec 24 i   i  i  i    i    i `* Re: Memory ordering17Chris M. Thomasson
5 Dec 24 i   i  i  i    i    i  +* Re: Memory ordering8jseigh
16 Dec22:48 i   i  i  i    i    i  i`* Re: Memory ordering7Chris M. Thomasson
17 Dec13:33 i   i  i  i    i    i  i `* Re: Memory ordering6jseigh
17 Dec21:38 i   i  i  i    i    i  i  +- Re: Memory ordering1aph
17 Dec21:41 i   i  i  i    i    i  i  `* Re: Memory ordering4Chris M. Thomasson
17 Dec22:45 i   i  i  i    i    i  i   +- Re: Memory ordering1MitchAlsup1
18 Dec12:43 i   i  i  i    i    i  i   `* Re: Memory ordering2jseigh
19 Dec03:48 i   i  i  i    i    i  i    `- Re: Memory ordering1Chris M. Thomasson
19 Dec19:33 i   i  i  i    i    i  `* Re: Memory ordering8MitchAlsup1
19 Dec22:19 i   i  i  i    i    i   `* Re: Memory ordering7Chris M. Thomasson
20 Dec00:59 i   i  i  i    i    i    +* Re: Memory ordering5MitchAlsup1
20 Dec01:21 i   i  i  i    i    i    i+* Re: Memory ordering2Chris M. Thomasson
20 Dec01:25 i   i  i  i    i    i    ii`- Re: Memory ordering1Chris M. Thomasson
20 Dec01:48 i   i  i  i    i    i    i`* Re: Memory ordering2Chris M. Thomasson
20 Dec01:58 i   i  i  i    i    i    i `- Re: Memory ordering1Chris M. Thomasson
20 Dec21:17 i   i  i  i    i    i    `- Re: Memory ordering1Chris M. Thomasson
4 Dec 24 i   i  i  i    i    +- Re: Memory ordering1Chris M. Thomasson
4 Dec 24 i   i  i  i    i    +- Re: Memory ordering1MitchAlsup1
5 Dec 24 i   i  i  i    i    `* Re: Memory ordering4Tim Rentsch
6 Dec 24 i   i  i  i    i     +* Re: Memory ordering2Terje Mathisen
6 Dec 24 i   i  i  i    i     i`- Re: Memory ordering1Tim Rentsch
20 Dec06:08 i   i  i  i    i     `- Re: Memory ordering1Chris M. Thomasson
17 Nov 24 i   i  i  i    +* Re: Memory ordering2Chris M. Thomasson
19 Nov 24 i   i  i  i    i`- Re: Memory ordering1Chris M. Thomasson
18 Nov 24 i   i  i  i    +- Re: Memory ordering1aph
21 Nov 24 i   i  i  i    +- Re: Memory ordering1Chris M. Thomasson
21 Nov 24 i   i  i  i    `- Re: Memory ordering1Chris M. Thomasson
15 Nov 24 i   i  i  +* Re: Memory ordering (was: Arm ldaxr / stxr loop question)2Michael S
15 Nov 24 i   i  i  i`- Re: Memory ordering (was: Arm ldaxr / stxr loop question)1Anton Ertl
15 Nov 24 i   i  i  +* Re: Memory ordering28jseigh
15 Nov 24 i   i  i  i`* Re: Memory ordering27Anton Ertl
15 Nov 24 i   i  i  i +* Re: Memory ordering18Chris M. Thomasson
16 Nov 24 i   i  i  i i`* Re: Memory ordering17Anton Ertl
17 Nov 24 i   i  i  i i `* Re: Memory ordering16Chris M. Thomasson
17 Nov 24 i   i  i  i i  `* Re: Memory ordering15Anton Ertl
18 Nov 24 i   i  i  i i   `* Re: Memory ordering14Chris M. Thomasson
18 Nov 24 i   i  i  i i    `* Re: Memory ordering13Anton Ertl
19 Nov 24 i   i  i  i i     `* Re: Memory ordering12Chris M. Thomasson
19 Nov 24 i   i  i  i i      `* Re: Memory ordering11Chris M. Thomasson
26 Nov 24 i   i  i  i i       +* Re: Memory ordering4Chris M. Thomasson
3 Dec 24 i   i  i  i i       `* Re: Memory ordering6Anton Ertl
15 Nov 24 i   i  i  i +* Re: Memory ordering7BGB
17 Nov 24 i   i  i  i `- Re: Memory ordering1Tim Rentsch
16 Nov 24 i   i  i  +- Re: Memory ordering (was: Arm ldaxr / stxr loop question)1Anton Ertl
16 Nov 24 i   i  i  +- Re: Memory ordering (was: Arm ldaxr / stxr loop question)1Lawrence D'Oliveiro
18 Nov 24 i   i  i  `- Re: Memory ordering1aph
21 Nov 24 i   i  `* Re: Arm ldaxr / stxr loop question3Kent Dickey
9 Nov 24 i   `* Re: Arm ldaxr / stxr loop question2jseigh
8 Nov 24 +* Re: Arm ldaxr / stxr loop question8Lawrence D'Oliveiro
20 Dec10:11 `- Re: Arm ldaxr / stxr loop question1Chris M. Thomasson

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