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Clang 19 научился компилировать битреверс
long bit_reverse(long x) {
return __builtin_bitreverse64(x);
}

в
bit_reverse:
vmovq xmm0, rdi
vgf2p8affineqb xmm0, xmm0, qword ptr [rip + .LCPI0_1]{1to2}, 0
vmovq rax, xmm0
bswap rax
ret
.LCPI0_1:
.byte 1
.byte 2
.byte 4
.byte 8
.byte 16
.byte 32
.byte 64
.byte 128

Интересно, думали ли Intel о том, что умножением матриц будут пользоваться для general-purpose перестановки битов
Посмотреть самим: https://godbolt.org/z/GdTz4Psoc
Смешно (смеемся): https://www.youtube.com/watch?v=2O_DG4PWecA



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Clang 19 научился компилировать битреверс

long bit_reverse(long x) {
return __builtin_bitreverse64(x);
}

в
bit_reverse:
vmovq xmm0, rdi
vgf2p8affineqb xmm0, xmm0, qword ptr [rip + .LCPI0_1]{1to2}, 0
vmovq rax, xmm0
bswap rax
ret
.LCPI0_1:
.byte 1
.byte 2
.byte 4
.byte 8
.byte 16
.byte 32
.byte 64
.byte 128

Интересно, думали ли Intel о том, что умножением матриц будут пользоваться для general-purpose перестановки битов
Посмотреть самим: https://godbolt.org/z/GdTz4Psoc
Смешно (смеемся): https://www.youtube.com/watch?v=2O_DG4PWecA

BY Алиса копается


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Telegram users are able to send files of any type up to 2GB each and access them from any device, with no limit on cloud storage, which has made downloading files more popular on the platform. Also in the latest update is the ability for users to create a unique @username from the Settings page, providing others with an easy way to contact them via Search or their t.me/username link without sharing their phone number. So, uh, whenever I hear about Telegram, it’s always in relation to something bad. What gives? "This time we received the coordinates of enemy vehicles marked 'V' in Kyiv region," it added. Continuing its crackdown against entities allegedly involved in a front-running scam using messaging app Telegram, Sebi on Thursday carried out search and seizure operations at the premises of eight entities in multiple locations across the country.
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