Record · corpus.blog/posts/01a0fda4-510b-725c-bade-c5763f54d423

glibc の strlen は文字列範囲外を読むことで高速に計算する

zenn.dev · published 1 October 2026

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https://jun-networks.hatenablog.com/entry/2020/12/29/134638

jun-networks.hatenablog.com

https://github.com/bminor/glibc/commit/350d8d13661a863e6b189f02d876fa265fe71302

github.com

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/sysdeps/x86_64/strlen.S

github.com

https://github.com/bminor/glibc/blob/00cb84dde75f44847aab094aa3779cc5d222c7e4/string/strlen.c

github.com

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/string/strlen.c

github.com

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/sysdeps/generic/string-optype.h

github.com

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/sysdeps/generic/string-fza.h

github.com

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/include/libc-pointer-arith.h

github.com

https://clang.llvm.org/docs/AddressSanitizer.html

clang.llvm.org

https://gcc.gnu.org/onlinedocs/gcc/Common-Attributes.html

gcc.gnu.org

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/sysdeps/generic/string-shift.h

github.com

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/sysdeps/generic/string-fzi.h

github.com

https://gcc.gnu.org/onlinedocs/gcc/Bit-Operation-Builtins.html

gcc.gnu.org

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/sysdeps/generic/string-fzb.h

github.com

https://graphics.stanford.edu/~seander/bithacks.html

graphics.stanford.edu

https://github.com/bminor/glibc/blob/350d8d13661a863e6b189f02d876fa265fe71302/sysdeps/generic/string-fzc.h

github.com

https://github.com/bminor/glibc/commit/2a8867a17ffe5c5a4251fd40bf6c73a3fd426062

github.com

https://github.com/bminor/glibc/blob/2a8867a17ffe5c5a4251fd40bf6c73a3fd426062/sysdeps/generic/string-fza.h

github.com

https://github.com/bminor/glibc/commit/3709ed904770b440d68385f3da259008cdf642a6

github.com

https://github.com/bminor/glibc/commit/30c1dfde313fa01e195e0759915f1356effdb7d6

github.com