<bit>: popcount() utilizes cnt instruction on arm64 - #2127
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Stephan T. Lavavej (StephanTLavavej) merged 16 commits intoSep 11, 2021
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Co-authored-by: Alex Guteniev <gutenev@gmail.com>
<bit>: popcount() utilizes cnt instruction on arm64
Co-authored-by: Alex Guteniev <gutenev@gmail.com>
Alex Guteniev (AlexGuteniev)
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Aug 16, 2021
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Alex Guteniev (AlexGuteniev)
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Stephan T. Lavavej (StephanTLavavej)
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Charlie Barto (barcharcraz)
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Aug 25, 2021
Charlie Barto (barcharcraz)
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Stephan T. Lavavej (StephanTLavavej)
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Igor Zhukov (@fsb4000) Thanks! I've pushed a merge with Also FYI Charlie Barto (@barcharcraz) Alex Guteniev (@AlexGuteniev). |
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I'm mirroring this to the MSVC-internal repo now. Please notify me if any further changes are pushed. |
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Thanks for improving ARM64 codegen! 🦾 🚀 ✔️ |
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Peter Johnson (PeterJohnson)
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Aug 29, 2023
MSVC on arm64 doesn't have a __popcnt intrinsic. Use NEON instructions instead (core implementation from microsoft/STL#2127).
Peter Johnson (PeterJohnson)
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Sep 7, 2023
Use NEON instructions for ARM64 (implementation based on microsoft/STL#2127). Godbolt output here: https://godbolt.org/z/q7GPTqT14
Even Rouault (rouault)
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Dec 9, 2023
Use NEON instructions for ARM64 (implementation based on microsoft/STL#2127). Godbolt output here: https://godbolt.org/z/q7GPTqT14
Alexander Smorkalov (asmorkalov)
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Dec 10, 2023
ht_dec.c: Improve MSVC arm64 popcount performance #24205 Use NEON instructions for ARM64 (implementation based on microsoft/STL#2127, which is Apache licensed). Godbolt output here: https://godbolt.org/z/q7GPTqT14 Related patch to openjpeg: uclouvain/openjpeg#1479 ### Pull Request Readiness Checklist - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch
thewoz
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ht_dec.c: Improve MSVC arm64 popcount performance opencv#24205 Use NEON instructions for ARM64 (implementation based on microsoft/STL#2127, which is Apache licensed). Godbolt output here: https://godbolt.org/z/q7GPTqT14 Related patch to openjpeg: uclouvain/openjpeg#1479 ### Pull Request Readiness Checklist - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch
Savya Sanchi Sharma (SavyaSanchi-Sharma)
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Jul 30, 2026
ht_dec.c: Improve MSVC arm64 popcount performance opencv#24205 Use NEON instructions for ARM64 (implementation based on microsoft/STL#2127, which is Apache licensed). Godbolt output here: https://godbolt.org/z/q7GPTqT14 Related patch to openjpeg: uclouvain/openjpeg#1479 ### Pull Request Readiness Checklist - [x] I agree to contribute to the project under Apache 2 License. - [x] To the best of my knowledge, the proposed patch is not based on a code under GPL or another license that is incompatible with OpenCV - [x] The PR is proposed to the proper branch
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Fixes #1924
I didn't test it.
godbolt: https://godbolt.org/z/zj3ojEeaM