Conversation
coolbean

Ⅷ of Swords

Edited 1 month ago

so, armv8 is 16bit (thumb accessible under aarch32 mode), 32bit (aarch32) and 64bit (aarch64), all in one isa

and this is supposed to be a less complex more energy efficient isa

2
0
2
coolbean

Ⅷ of Swords

Reply to @coolbean

the worst part is that it is, arm processors are more energy efficient and get less hot than their x86_64 equivalents, how much of that comes down to the isa instead of implementation is a different question however

0
0
1
quasar@translunar.academy

quasar

Reply to @coolbean
@coolbean i think you forgot neon
1
0
1
coolbean

Ⅷ of Swords

Reply to @quasar@translunar.academy

@quasar 8-bit instructions

so help me god armv8 includes the whole fucking history of home computing

1
0
0
quasar@translunar.academy

quasar

Reply to @coolbean
@coolbean also armv7 previously had a dedocated Vector Floating Point floating point unit on the mcfucking cpu
2
0
1
quasar@translunar.academy

quasar

Reply to @quasar@translunar.academy
@coolbean armv8 does not have this
0
0
1
coolbean

Ⅷ of Swords

Reply to @quasar@translunar.academy

@quasar putting arm engineers into a cage with hitachi’s original superh engineers just to see what happens

1
0
1
quasar@translunar.academy

quasar

Reply to @coolbean
@coolbean dont look at the documentation documenting ARMv7's neon vs ARMv8 neon's differences
2
0
1
quasar@translunar.academy

quasar

Reply to @quasar@translunar.academy
@coolbean or that armv8 introduced THUMB 2
1
0
1
coolbean

Ⅷ of Swords

Reply to @quasar@translunar.academy

@quasar im so glad im only looking at an overview so all i see is bigger registers and adding double precision floating points

0
0
1
coolbean

Ⅷ of Swords

Reply to @quasar@translunar.academy

@quasar theres a thumb 2???

1
0
0
quasar@translunar.academy

quasar

Reply to @coolbean
@coolbean YES https://en.wikipedia.org/wiki/ARM_architecture_family#Thumb-2
1
0
0
quasar@translunar.academy

quasar

Reply to @quasar@translunar.academy
@coolbean mixed 32 bit and 16 bit instructions
2
0
1
quasar@translunar.academy

quasar

Reply to @quasar@translunar.academy
@coolbean see armv8 neon made neon go from 64 bit to 128 bit
2
0
1
quasar@translunar.academy

quasar

Reply to @quasar@translunar.academy
@coolbean i only know this because i spent a year or two learning about ARM to optimize things
0
0
1
coolbean

Ⅷ of Swords

Reply to @quasar@translunar.academy

@quasar on one hand, it makes sense

with ordinary instructions being 64bit having a 16/32bit extension for memory density is justifiable

the problem is also keeping around aarch32, including the original 16-bit-only thumb

kinda poetic how arm has 2 thumbs tho

1
0
0
coolbean

Ⅷ of Swords

Reply to @quasar@translunar.academy

@quasar well the register size, instructions were 8bit to begin with (though there was support for 16bit ones in armv6 apparently, god knows why you would bother)

0
0
0
quasar@translunar.academy

quasar

Reply to @coolbean
@coolbean and then, you dig into GCC, and you find "Generate code that supports calling between the ARM and Thumb instruction sets. Without this option, on pre-v5 architectures, the two instruction sets cannot be reliably used inside one program. The default is -mno-thumb-interwork, since slightly larger code is generated when -mthumb-interwork is specified. In AAPCS configurations this option is meaningless."
1
0
1
coolbean

Ⅷ of Swords

Reply to @quasar@translunar.academy

@quasar i have decided im simply not going acknowledge any isas made after the year 2000, just gonna install netbsd on a dreamcast and live my life in peace

1
0
1
quasar@translunar.academy

quasar

Reply to @coolbean
@coolbean "wait it's all garbage ISA?"
0
0
1
coolbean

Ⅷ of Swords

Edited 1 month ago

@quasar any isa designed after 1999 cant compute, all they know is backwards compatibility mode, predict they branches, include javascript-specific instructions, be bi-endian, make chip hot and lie

RE: https://social.translunar.academy/objects/3360e59e-4824-4472-b57b-7fa46d6eaca3

1
0
0
quasar@translunar.academy

quasar

Reply to @coolbean
@coolbean f00f bug
0
0
1
About Coral Castle

coral castle

welcome to coral castle, a chill community sailing on the fediverse. we strive to be a safe, left-leaning, queer-friendly, communitarian space for all kinds of folk. before joining, make sure to read our community guidelines.

community guidelines

  1. you must be over 14 years old to join. coral castle's servers are hosted in chile, and under article 19,628 of the laws of chile, we are unauthorized to collect data from people under 14.
  2. do not spam or raid. the fediverse is not your space to intoxicate.
  3. nsfw/nsfl content must be marked as sensitive. coral castle is built to be used as a casual instance, and as such should be accessible anywhere.
  4. hate speech, paraphilia, and harassment will get you banned. having basic human decency is key anywhere. whether it is in real life or on the internet, don't be a jerk.
  5. keep things legal. this includes pirated content, since we want to keep a good relationship across fediverse servers. posting CSAM is strictly forbidden and will result in legal action.

moderation policies

the sanctions for local users will be relative to the gravity of their infringements, varying from simply deleting the offending material, to warning the user through a three-strike system, to immediately banning the offending user.

if you're an instance administrator and you think your instance was sanctioned by mistake, feel free to appeal by emailing me at lux@nixgoat.me

special thanks

to our donators, for helping keep this instance up:

also, to the following organizations:

  • Nekiori, who restored the disk powering coral castle on october 2023
  • Backblaze, for providing our backup service