{"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\/sq\/blog\/news\/odnostrochnoe-izmenenie-v-gcc-privelo-k-uskoreniyu-na-12-v-odnom-teste-i-zamedleniyu-na-14-v-drugom","title":{"rendered":"Nj\u00eb ndryshim i vog\u00ebl n\u00eb GCC \u00e7oi n\u00eb nj\u00eb p\u00ebrmir\u00ebsim prej 12% n\u00eb nj\u00eb test dhe nj\u00eb ngadal\u00ebsim prej 14% n\u00eb nj\u00eb tjet\u00ebr.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"
Nj\u00eb inxhinier nga kompania Intel b\u00ebri nj\u00eb ndryshim nj\u00eb-rresht n\u00eb paket\u00ebn e kompilueseve GCC, i cili rrit pesh\u00ebn e parashikimeve t\u00eb gabuara t\u00eb degeve n\u00eb procesor\u00ebt x86. Ky ndryshim lejon t\u00eb rritet performanca e kodit t\u00eb gjeneruar gjat\u00eb testit 544.nab_r me 12.7% kur aktivizohen optimizimet «-O2 -mtune=graniterapids» p\u00ebr CPU-n\u00eb Intel Granite Rapids\/Xeon 6 dhe me 12.1% kur aktivizohen optimizimet «-O2 -mtune=znver5» p\u00ebr CPU-n\u00eb AMD Zen5.<\/p>\n
Ndryshimi i pesh\u00ebs nga «COSTS_N_INSNS (2)» n\u00eb «COSTS_N_INSNS (2) + 3» rrit r\u00ebnd\u00ebsin\u00eb e gabimeve t\u00eb parashikimit nga 2 n\u00eb 5 instrukcione t\u00eb kushtueshme, duke reflektuar m\u00eb mir\u00eb karakteristikat e konvejer\u00ebve t\u00eb procesimit t\u00eb komandave (pipeline) n\u00eb CPU-t\u00eb moderne, ku gabimet e parashikimit t\u00eb degeve jan\u00eb m\u00eb t\u00eb kushtueshme. Ky ndryshim i pesh\u00ebs \u00e7on n\u00eb forcimin e transformimit t\u00eb shprehjeve «if» n\u00eb komanda kushtore pa kalime, si\u00e7 jan\u00eb CMOV, duke eliminuar ndalimet p\u00ebr shkak t\u00eb parashikimeve t\u00eb gabuara t\u00eb degeve q\u00eb shkaktohen nga nevoja p\u00ebr t\u00eb rivendosur gjendjen e konvejerit. M\u00eb par\u00eb, pesha «COSTS_N_INSNS (2) + 3» ishte e caktuar n\u00eb GCC vet\u00ebm p\u00ebr procesor\u00ebt Intel Ice Lake dhe Alder Lake, por tani \u00ebsht\u00eb vendosur p\u00ebr profilin e p\u00ebrgjithsh\u00ebm (generic) t\u00eb procesor\u00ebve x86.<\/p>\n
\u00cbsht\u00eb e r\u00ebnd\u00ebsishme t\u00eb theksohet se pas miratimit t\u00eb patch-it, doli nj\u00eb regresion, q\u00eb shkaktoi q\u00eb testi «Hint» t\u00eb ekzekutohet p\u00ebr 30% m\u00eb ngadal\u00eb nga nj\u00ebri nga zhvilluesit e GCC-s\u00eb kur nd\u00ebrtohet me opsionet «-march=generic -mtune=znver5» dhe «-march=generic -mtune=graniterapids». Performanca e kalimeve t\u00eb testeve SPEC2017 dhe SPEC2026 pas k\u00ebtij ndryshimi mbeti n\u00eb t\u00eb nj\u00ebjtin nivel. Prania e regresionit \u00ebsht\u00eb konfirmuar nga autori i komitit origjinal; sipas tij, ngadal\u00ebsimi i kalimit t\u00eb testit Hint \u00ebsht\u00eb 14% kur nd\u00ebrtohet me opsionet «-O2 -mtune=generic -march=x86-64-v3». <\/p>\n
Ngadal\u00ebsimi shpjegohet me faktin se n\u00eb kodin e testit Hint ka vet\u00ebm nj\u00eb struktur\u00eb kushtore, e cila transformohet nga GCC n\u00eb nj\u00eb p\u00ebrfaq\u00ebsim t\u00eb bazuar n\u00eb CMOV. Kjo struktur\u00eb ekzekutohet mjaft rrall\u00eb (n\u00eb 3%) dhe optimizimi i saj nuk ndikon n\u00eb performanc\u00eb. Megjithat\u00eb, ndryshimi i modit t\u00eb gjenerimit t\u00eb kodit \u00e7oi n\u00eb nj\u00eb efekt an\u00ebsor, i cili ngadal\u00ebsoi ekzekutimin e kodit q\u00eb ekzekutohej m\u00eb shpesh. \n Burimi: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"