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Replace vseq/vand with their immediate-form variants#630

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lhecker merged 1 commit intomicrosoft:mainfrom
heiher:loong-simd-opt
Aug 28, 2025
Merged

Replace vseq/vand with their immediate-form variants#630
lhecker merged 1 commit intomicrosoft:mainfrom
heiher:loong-simd-opt

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@heiher heiher commented Aug 28, 2025 

simd/lines_fwd/134217728
                        time:   [4.3447 ms 4.3474 ms 4.3505 ms]
                        thrpt:  [28.732 GiB/s 28.753 GiB/s 28.771 GiB/s]
                 change:
                        time:   [−1.8221% −1.7185% −1.6176%] (p = 0.00 < 0.05)
                        thrpt:  [+1.6442% +1.7485% +1.8559%]
                        Performance has improved.

@heiher
Replace vseq/vand with their immediate-form variants
2713edd 
```
simd/lines_fwd/134217728
                        time:   [4.3447 ms 4.3474 ms 4.3505 ms]
                        thrpt:  [28.732 GiB/s 28.753 GiB/s 28.771 GiB/s]
                 change:
                        time:   [−1.8221% −1.7185% −1.6176%] (p = 0.00 < 0.05)
                        thrpt:  [+1.6442% +1.7485% +1.8559%]
                        Performance has improved.
```
lhecker
lhecker approved these changes Aug 28, 2025
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Oh, that's very interesting! I was reading a lot of RISC-V lately (my first time doing so) and this reminds me a lot of it. I hope LoongArch continuous to gain popularity. 🙂

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lhecker commented Aug 28, 2025

Apropos, I'm possibly looking to implement this algorithm in the future: http://0x80.pl/notesen/2018-10-18-simd-byte-lookup.html
I could use it for my syntax highlighting PR where I implemented a custom regex engine. Perhaps this could also be of interest for you? I think it may find some great reuse as other regex engines use similar approaches. I'm just not sure if it'll be easily translatable to LoongArch (or even NEON for that matter).

@lhecker lhecker merged commit ccfebb2 into microsoft:main Aug 28, 2025
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@heiher heiher deleted the loong-simd-opt branch August 29, 2025 05:18
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heiher commented Aug 30, 2025

I'm just not sure if it'll be easily translatable to LoongArch (or even NEON for that matter).

It seems that LoongArch SIMD should be able to handle this without much trouble.

Lou32Verbose pushed a commit to Lou32Verbose/edit that referenced this pull request Jan 11, 2026
@heiher
Replace vseq/vand with their immediate-form variants (microsoft#630)
ad3f946
jenia90 pushed a commit to jenia90/edit that referenced this pull request Jan 30, 2026
@heiher @jenia90
Replace vseq/vand with their immediate-form variants (microsoft#630)
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