Sujet : Re: Byte Addressability And Beyond
De : already5chosen (at) *nospam* yahoo.com (Michael S)
Groupes : comp.archDate : 05. May 2024, 11:13:27
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <20240505121327.00000946@yahoo.com>
References : 1 2 3 4 5 6
User-Agent : Claws Mail 3.19.1 (GTK+ 2.24.33; x86_64-w64-mingw32)
On Sun, 5 May 2024 07:43:27 -0000 (UTC)
Thomas Koenig <
tkoenig@netcologne.de> wrote:
Scott Lurndal <scott@slp53.sl.home> schrieb:
d) all modern major architectures have instructions for bitfield
manipulation (insert, extract) obviating any need for general
bit-level addressing.
RISC-V: Seems like it's an extension, for which only a draft is
available, so it is debatable if it has it or not.
POWER: Certainly, the rlwinm instruction.
AMD64: Sure, pdep and friends.
>
PEXTR/PDEP has no immediate form, which makes it inconvenient for
'C'-style fixed bit fields. Unless you access the same bifield
repeatedly, it takes two instructions instead of 1 (the first is move
reg,imm). Also, on many AMD processors PDEP/PEXTR is slow.
BEXTR has the same problem of absence of immediate form, but at least it
is fast across the board. Unfortunately, BEXTR does not help bit field
insertion.
ARM: You certainly know by heart, I don't need to look.
Loongarch: Looking at the docs, it also has it (BSTRINS etc).
So, with the possible exception of RISC-V, I cannot see anything
to contradict you :-)
Date | Sujet | # | | Auteur |
1 May 24 | Byte Addressability And Beyond | 590 | | Lawrence D'Oliveiro |
1 May 24 | Re: Byte Addressability And Beyond | 431 | | John Levine |
1 May 24 | Re: Byte Addressability And Beyond | 409 | | Lawrence D'Oliveiro |
1 May 24 | Re: Byte Addressability And Beyond | 3 | | John Levine |
1 May 24 | Re: Byte Addressability And Beyond | 1 | | John Levine |
1 May 24 | Re: Byte Addressability And Beyond | 1 | | Lawrence D'Oliveiro |
1 May 24 | Re: Byte Addressability And Beyond | 1 | | Michael S |
1 May 24 | Re: Byte Addressability And Beyond | 404 | | John Levine |
2 May 24 | Re: Byte Addressability And Beyond | 382 | | Lawrence D'Oliveiro |
2 May 24 | Re: Byte Addressability And Beyond | 4 | | John Levine |
2 May 24 | Re: Byte Addressability And Beyond | 3 | | Lawrence D'Oliveiro |
2 May 24 | Re: Byte Addressability And Beyond | 2 | | John Levine |
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8 May 24 | Re: Byte Addressability And Beyond | 363 | | John Savard |
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8 May 24 | Re: Byte Addressability And Beyond | 359 | | John Levine |
8 May 24 | Re: Byte Addressability And Beyond | 357 | | Lawrence D'Oliveiro |
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27 May 24 | Re: Byte Addressability And Beyond | 155 | | John Levine |
27 May 24 | Re: Byte Addressability And Beyond | 154 | | Lawrence D'Oliveiro |
27 May 24 | Re: Byte Addressability And Beyond | 153 | | John Levine |
27 May 24 | Re: Byte Addressability And Beyond | 149 | | John Levine |
27 May 24 | Re: Byte Addressability And Beyond | 1 | | MitchAlsup1 |
28 May 24 | Re: Byte Addressability And Beyond | 147 | | Lawrence D'Oliveiro |
28 May 24 | Re: encoding conversion, Byte Addressability And Beyond | 1 | | John Levine |
28 May 24 | Re: Byte Addressability And Beyond | 145 | | Thomas Koenig |
29 May 24 | Re: Byte Addressability And Beyond | 137 | | Lawrence D'Oliveiro |
29 May 24 | Re: Byte Addressability And Beyond | 136 | | Anton Ertl |
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29 May 24 | Re: Byte Addressability And Beyond | 10 | | Stefan Monnier |
29 May 24 | Re: Byte Addressability And Beyond | 3 | | John Levine |
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4 Jun 24 | Re: Byte Addressability And Beyond | 1 | | George Neuner |
30 May 24 | Re: Byte Addressability And Beyond | 6 | | Anton Ertl |
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30 May 24 | Re: architectural goals, Byte Addressability And Beyond | 21 | | Thomas Koenig |
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5 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 12 | | Lawrence D'Oliveiro |
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6 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 10 | | George Neuner |
6 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 6 | | John Levine |
7 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 4 | | Lawrence D'Oliveiro |
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7 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 2 | | Lawrence D'Oliveiro |
7 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 1 | | Stephen Fuld |
7 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 1 | | Terje Mathisen |
6 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 1 | | Lynn Wheeler |
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7 Jun 24 | Re: architectural goals, Byte Addressability And Beyond | 1 | | Lawrence D'Oliveiro |
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