Re: Cost of handling misaligned access

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Sujet : Re: Cost of handling misaligned access
De : robfi680 (at) *nospam* gmail.com (Robert Finch)
Groupes : comp.arch
Date : 21. Feb 2025, 02:26:57
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <vp8kp3$334fu$1@dont-email.me>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
User-Agent : Mozilla Thunderbird
Admittedly part of why I have such mixed feelings on full
compare-and-branch:
   Pro: It can offer a performance advantage (in terms of per-clock);
   Con: Branch is now beholden to the latency of a Subtract.
     Con: it can't compare to a constant
     Con: it can't compare floating point
 
compare to constant, and floating point compares are supported in Q+ so the cons are gone
constant compare is supported with the constant postfix. Because bits are available in the instruction there is also a precision field. One can compare bytes and branch for instance.
Q+ supports all kinds of compares including those generating bit vectors and SETxx, ZSETxx type compares. That is maybe its drawback, supporting too many things.

Date Sujet#  Auteur
13 Feb 25 * Re: Cost of handling misaligned access48Marcus
13 Feb 25 +- Re: Cost of handling misaligned access1Thomas Koenig
14 Feb 25 +* Re: Cost of handling misaligned access41BGB
14 Feb 25 i`* Re: Cost of handling misaligned access40MitchAlsup1
18 Feb 25 i `* Re: Cost of handling misaligned access39BGB
18 Feb 25 i  +* Re: Cost of handling misaligned access33MitchAlsup1
18 Feb 25 i  i+- Re: Cost of handling misaligned access1BGB
18 Feb 25 i  i`* Re: Cost of handling misaligned access31Michael S
18 Feb 25 i  i +- Re: Cost of handling misaligned access1Thomas Koenig
18 Feb 25 i  i +* Re: Cost of handling misaligned access26MitchAlsup1
18 Feb 25 i  i i`* Re: Cost of handling misaligned access25Terje Mathisen
18 Feb 25 i  i i `* Re: Cost of handling misaligned access24MitchAlsup1
19 Feb 25 i  i i  `* Re: Cost of handling misaligned access23Terje Mathisen
19 Feb 25 i  i i   `* Re: Cost of handling misaligned access22MitchAlsup1
19 Feb 25 i  i i    `* Re: Cost of handling misaligned access21BGB
20 Feb 25 i  i i     +- Re: Cost of handling misaligned access1Robert Finch
20 Feb 25 i  i i     +* Re: Cost of handling misaligned access5MitchAlsup1
20 Feb 25 i  i i     i+* Re: Cost of handling misaligned access2BGB
20 Feb 25 i  i i     ii`- Re: Cost of handling misaligned access1BGB
21 Feb 25 i  i i     i`* Re: Cost of handling misaligned access2Robert Finch
21 Feb 25 i  i i     i `- Re: Cost of handling misaligned access1BGB
21 Feb 25 i  i i     `* Re: Cost of handling misaligned access14BGB
22 Feb 25 i  i i      +- Re: Cost of handling misaligned access1Robert Finch
22 Feb 25 i  i i      `* Re: Cost of handling misaligned access12Robert Finch
23 Feb 25 i  i i       +* Re: Cost of handling misaligned access10BGB
23 Feb 25 i  i i       i`* Re: Cost of handling misaligned access9Michael S
24 Feb 25 i  i i       i +- Re: Cost of handling misaligned access1BGB
24 Feb 25 i  i i       i `* Re: Cost of handling misaligned access7Michael S
24 Feb 25 i  i i       i  +* Re: Cost of handling misaligned access4Robert Finch
24 Feb 25 i  i i       i  i+- Re: Cost of handling misaligned access1BGB
24 Feb 25 i  i i       i  i`* Re: Cost of handling misaligned access2MitchAlsup1
25 Feb 25 i  i i       i  i `- Re: Cost of handling misaligned access1BGB
25 Feb 25 i  i i       i  `* Re: Cost of handling misaligned access2MitchAlsup1
25 Feb 25 i  i i       i   `- Re: Cost of handling misaligned access1BGB
23 Feb 25 i  i i       `- Re: Cost of handling misaligned access1Robert Finch
18 Feb 25 i  i `* Re: Cost of handling misaligned access3BGB
19 Feb 25 i  i  `* Re: Cost of handling misaligned access2MitchAlsup1
19 Feb 25 i  i   `- Re: Cost of handling misaligned access1BGB
18 Feb 25 i  `* Re: Cost of handling misaligned access5Robert Finch
18 Feb 25 i   `* Re: Cost of handling misaligned access4BGB
18 Feb 25 i    `* Re: Cost of handling misaligned access3Brett
18 Feb 25 i     `* Re: Cost of handling misaligned access2Marcus
18 Feb 25 i      `- Re: Cost of handling misaligned access1BGB
17 Feb 25 `* Re: Cost of handling misaligned access5Terje Mathisen
17 Feb 25  +- Re: Cost of handling misaligned access1Thomas Koenig
17 Feb 25  `* Re: Cost of handling misaligned access3MitchAlsup1
17 Feb 25   `* Re: Cost of handling misaligned access2Terje Mathisen
17 Feb 25    `- Re: Cost of handling misaligned access1MitchAlsup1

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