{"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\/ro\/blog\/news\/odnostrochnoe-izmenenie-v-gcc-privelo-k-uskoreniyu-na-12-v-odnom-teste-i-zamedleniyu-na-14-v-drugom","title":{"rendered":"O schimbare de o linie \u00een GCC a dus la o accelerare de 12% \u00eentr-un test \u0219i la \u00eencetinirea cu 14% \u00een altul.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Un inginer de la Intel a efectuat o modificare simpl\u0103 \u00een setul de compilatoare GCC, care cre\u0219te impactul predic\u021biilor gre\u0219ite de ramificare pe procesoarele x86. Aceast\u0103 modificare a permis \u00eembun\u0103t\u0103\u021birea performan\u021bei codului generat cu 12,7% \u00een timpul testului 544.nab_r c\u00e2nd sunt activate optimiz\u0103rile «-O2 -mtune=graniterapids» pentru CPU Intel Granite Rapids\/Xeon 6 \u0219i cu 12,1% atunci c\u00e2nd sunt activate optimiz\u0103rile «-O2 -mtune=znver5» pentru CPU AMD Zen5.<\/p>\n

Schimbarea greut\u0103\u021bii de la «COSTS_N_INSNS (2)» la «COSTS_N_INSNS (2) + 3» cre\u0219te semnifica\u021bia erorii de predic\u021bie de la 2 la 5 instruc\u021biuni condi\u021bionale, ceea ce reflect\u0103 mai bine caracteristicile conveierelor de procesare a comenzilor (pipeline) \u00een procesoarele moderne, unde erorile de predic\u021bie a ramific\u0103rii sunt mai costisitoare. Modificarea greut\u0103\u021bii for\u021beaz\u0103 compilatorul s\u0103 transforme expresiile «if» \u00een comenzi condi\u021bionale f\u0103r\u0103 salturi, cum ar fi CMOV, elimin\u00e2nd pauzele cauzate de necesitatea reset\u0103rii st\u0103rii conveierului \u00een cazul unei predic\u021bii gre\u0219ite de ramificare. Anterior, greutatea «COSTS_N_INSNS (2) + 3» era specificat\u0103 \u00een GCC doar pentru procesoarele Intel Ice Lake \u0219i Alder Lake, iar acum este setat\u0103 pentru profilul generic al procesoarelor x86.<\/p>\n

Este de remarcat faptul c\u0103, dup\u0103 acceptarea patch-ului, a ap\u0103rut o regresie care face ca testul «Hint» s\u0103 ruleze cu 30% mai lent pe unii dintre dezvoltatorii GCC atunci c\u00e2nd se compileaz\u0103 cu op\u021biunile «-march=generic -mtune=znver5» \u0219i «-march=generic -mtune=graniterapids». Performan\u021ba testelor SPEC2017 \u0219i SPEC2026 a r\u0103mas la acela\u0219i nivel dup\u0103 implementarea modific\u0103rii. Existen\u021ba regresiei a fost confirmat\u0103 de autorul acelui commit ini\u021bial, care a raportat o \u00eencetinire de 14% \u00een rularea testului Hint c\u00e2nd se compileaz\u0103 cu op\u021biunile «-O2 -mtune=generic -march=x86-64-v3». <\/p>\n

\u00cencetinirea este explicat\u0103 de faptul c\u0103 \u00een codul testului Hint exist\u0103 o singur\u0103 construc\u021bie condi\u021bional\u0103, care este transformat\u0103 de GCC \u00eentr-o reprezentare bazat\u0103 pe CMOV. Aceast\u0103 construc\u021bie este executat\u0103 destul de rar (\u00een 3%) \u0219i optimizarea sa nu are un impact asupra performan\u021bei. Modificarea modului de generare a codului a dus, \u00een schimb, la un efect secundar care a \u00eencetinit execu\u021bia unui cod care este executat mai frecvent.
\n
Sursa: opennet.ro<\/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\udd47O modificare de o singur\u0103 linie \u00een GCC a dus la o accelerare de 12% \u00eentr-un test \u0219i la o \u00eencetinire de 14% \u00een altul | ProHoster","description":"Un inginer de la Intel a introdus o modificare de o singur\u0103 linie \u00een setul de compilatoare GCC, cresc\u00e2nd greutatea predic\u021biei eronate a ramific\u0103rii pe procesoarele 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