목록전체 글 (142)

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[TODO] Alive: Provably Correct InstCombine Optimizations

https://youtu.be/iV5jBtE35r4?si=DrrIq7UaO-bJSlZb 이걸 왜 못봤어나 싶다.
LLVM-STUDY/ALIVE2 2024. 1. 14. 20:55
LLVM debug tips

https://youtu.be/y4b-sgp6VYA?si=FBwXN-abkikLJwx0 cmake .. -GNinja \ -DCMAKE_BUILD_TYPE=Release \ -DLLVM_ENABLE_LLD=ON \ -DLLVM_ENABLE_PROJECTS="clang;lld;compiler-rt" \ -DLLVM_TARGETS_TO_BUILD="AArch64;ARM;X86" \ -DLLVM_ENABLE_ASSERTION=OFF -E : Stop before compiling -S : Stop before assembling -c : Stop before linking Dumping LEXER Tokens clang -Xclang -dump-tokens -E foo.cpp clang -Xclang -hel..
LLVM-STUDY 2024. 1. 14. 20:53
새 SSH 키 생성 및 ssh-agent에 추가

https://docs.github.com/ko/authentication/connecting-to-github-with-ssh/generating-a-new-ssh-key-and-adding-it-to-the-ssh-agent 새 SSH 키 생성 및 ssh-agent에 추가 - GitHub Docs SSH(보안 셸 프로토콜)를 사용하여 GitHub.com의 리포지토리에서 데이터를 액세스하고 쓸 수 있습니다. SSH를 통해 연결할 때 로컬 머신에서 프라이빗 키 파일을 사용하여 인증합니다. 자세한 내용은 docs.github.com
Technic 2023. 12. 22. 02:06
improve bitfield arithmetic #33784

https://github.com/llvm/llvm-project/issues/33874 Improve bitfield arithmetic · Issue #33874 · llvm/llvm-project Bugzilla Link 34526 Version trunk OS Windows NT CC @alexey-bataev,@legrosbuffle,@rotateright Extended Description We could improve math ops on irregular bitfields with the relevant SWAR style patte... github.com 패치목적 // 기존에 생성되던 IR define dso_local i8 @AddCounters(Counters, Counters)(..
LLVM-STUDY/PATCH 2023. 12. 20. 04:30
[InstCombine] Generalize folds for inversion of icmp operands

https://github.com/llvm/llvm-project/pull/74317 [InstCombine] Generalize folds for inversion of icmp operands by nikic · Pull Request #74317 · llvm/llvm-project We have a bunch of folds that basically perform X pred Y to ~Y pred ~X for various special cases where this saves an instruction. Generalize these folds to use isFreeToInvert(). We have to make sur... github.com // Transform (~X ^ Y) s< ..
LLVM-STUDY/PATCH 2023. 12. 15. 03:37
LLVM 내부에서 활용되는 논리식 모음

~X NOT X A + B NOT -1 -B - A B - A NOT A + (-1 - B) A - B NOT B + (-1 - A) A ^ B NOT A ^ ~B A ^ ~B NOT A ^ B A s>> B NOT ~A s>>B 부연설명 A+B -> -1 -B -A (양->음전) 100+100 이라고 하면, 결과는 200, NOT은 -201이 나와야 함. -100 -100 -1 = -201 A-B -> B + (-A - 1(양>음전)) A^B -> A^~B ; A^B는 A를 -1로 생각하면 -1^B -> ~B가 됨. 이의 NOT은 B. -1^~B = B A s>> B -> ~A s>> B ; (몰?루?)
LLVM-STUDY 2023. 12. 15. 03:34
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