{"id":182307,"date":"2026-06-24T20:48:35","date_gmt":"2026-06-24T18:48:35","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/odnostrochnoe-izmenenie-v-gcc-privelo-k-uskoreniyu-na-12-v-odnom-teste-i-zamedleniyu-na-14-v-drugom"},"modified":"2026-06-24T20:48:35","modified_gmt":"2026-06-24T18:48:35","slug":"odnostrochnoe-izmenenie-v-gcc-privelo-k-uskoreniyu-na-12-v-odnom-teste-i-zamedleniyu-na-14-v-drugom","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/odnostrochnoe-izmenenie-v-gcc-privelo-k-uskoreniyu-na-12-v-odnom-teste-i-zamedleniyu-na-14-v-drugom","title":{"rendered":"GCC-s \u00fchekordne muudatus t\u00f5i \u00fches testis 12% kiiruskasvu ja teises 14% aeglustumist.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Intel'i insener tegi GCC kompilaatorite kogumisse \u00fche rea muudatuse, mis suurendab vale haruennustuse kaalu x86 protsessoritel. Muudatus v\u00f5imaldas t\u00f5sta genereeritud koodi j\u00f5udlust 544.nab_r testi l\u00e4bimisel 12,7% v\u00f5rreldes CPU Intel Granite Rapids\/Xeon 6 jaoks valitud optimeeringutega \u201e-O2 -mtune=graniterapids\u201c ja 12,1% v\u00f5rreldes optimeeringutega \u201e-O2 -mtune=znver5\u201c CPU AMD Zen5 puhul.<\/p>\n

Kaalu muutmine \u201eCOSTS_N_INSNS (2)\u201c v\u00e4\u00e4rtusest \u201eCOSTS_N_INSNS (2) + 3\u201c t\u00f5stab ennustuse vea olulisust 2-lt 5-ni tinglikud instruktsioonid, mis peegeldab paremini kaasaegsete CPU-de k\u00e4supipeline'ide erip\u00e4ra, kus vale haruennustuse vead on kulukamad. Kaalu muutmine toob kaasa kompilaatori sundimise muuta v\u00e4ljendeid \u201eif\u201c tinglikeks k\u00e4skudeks ilma harudeta, n\u00e4iteks CMOV, v\u00e4listades vale haruennustuse t\u00f5ttu tekkinud viivitused, mis on tingitud pipeline'i oleku taastamise vajadusest. Varem m\u00e4\u00e4rati \u201eCOSTS_N_INSNS (2) + 3\u201c kaal GCC-s vaid Intel Ice Lake ja Alder Lake protsessoritele, n\u00fc\u00fcd on see m\u00e4\u00e4ratud geralise (generic) x86 protsessorite profiilile.<\/p>\n

Tuleb m\u00e4rkida, et p\u00e4rast patareide vastuv\u00f5tmist ilmnes regressioon, mille t\u00f5ttu test «Hint» t\u00f6\u00f6tas \u00fche GCC arendaja juures 30% aeglasemalt, kui koostati valikute «-march=generic -mtune=znver5» ja «-march=generic -mtune=graniterapids» abil. SPEC2017 ja SPEC2026 testide soorituse tase p\u00e4rast muudatuste tegemist j\u00e4i endiseks. Regressiooni on kinnitanud algse p\u00fchendumuse autor, kelle andmetel on Hint testi soorituse aeglustumine 14% koos valikutega «-O2 -mtune=generic -march=x86-64-v3». <\/p>\n

Aegluse p\u00f5hjuseks on see, et testi Hint koodis on ainult \u00fcks tingimuslik konstruktsioon, mille GCC muudab CMOV-p\u00f5hiseks esitluseks. See konstruktsioon t\u00f6\u00f6tab piisavalt harva (3% juhtudest) ja selle optimeerimine ei m\u00f5juta j\u00f5udlust. Samuti viis koodi genereerimise re\u017eiimi muutmine k\u00f5rvaltoime, mis aeglustas sagedamini t\u00e4idetava koodi t\u00e4itmist.
\n
Allikas: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0418\u043d\u0436\u0435\u043d\u0435\u0440 \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Intel \u0432\u043d\u0451\u0441 \u0432 \u043d\u0430\u0431\u043e\u0440 \u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u043e\u0432 GCC \u043e\u0434\u043d\u043e\u0441\u0442\u0440\u043e\u0447\u043d\u043e\u0435 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435, \u0443\u0432\u0435\u043b\u0438\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0435 \u0432\u0435\u0441 \u043d\u0435\u0432\u0435\u0440\u043d\u043e\u0433\u043e \u043f\u0440\u0435\u0434\u0441\u043a\u0430\u0437\u0430\u043d\u0438\u044f \u0432\u0435\u0442\u0432\u043b\u0435\u043d\u0438\u044f \u043d\u0430 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 x86. \u0418\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u043b\u043e \u043f\u043e\u0432\u044b\u0441\u0438\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u0433\u0435\u043d\u0435\u0440\u0438\u0440\u0443\u0435\u043c\u043e\u0433\u043e \u043a\u043e\u0434\u0430 \u043f\u0440\u0438 \u043f\u0440\u043e\u0445\u043e\u0436\u0434\u0435\u043d\u0438\u0438 \u0442\u0435\u0441\u0442\u0430 544.nab_r \u043d\u0430 12.7% \u043f\u0440\u0438 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0439 «-O2 -mtune=graniterapids» \u0434\u043b\u044f CPU Intel Granite Rapids\/Xeon 6 \u0438 \u043d\u0430 12.1% \u043f\u0440\u0438 \u0432\u043a\u043b\u044e\u0447\u0435\u043d\u0438\u0438 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0439 «-O2 -mtune=znver5» \u043d\u0430 CPU AMD Zen5. \u0418\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0435 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":8,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-182307","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47\u00dche readise muudatus GCC-s t\u00f5i kaasa 12% kiirus suurenemise \u00fches testis ja 14% aeglustumise teises | ProHoster","description":"Intel'i insener tegi GCC kompilaatorite kogus \u00fche rea muudatuse, mis suurendab vale haruennustuse kaalu x86 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