Zola Bridges ezivela kuGoogle kwisethi ye-LLVM compiler, isiqwenga esinokuphunyezwa kwe-SESES (i-Speculative Execution Side Effect Suppression) ukhuseleko, enceda ukuhlaselwa kwebhlokhi kwindlela yokubulawa okucingelwayo kwi-Intel CPUs, njenge . Indlela yokukhusela iphunyezwe kwinqanaba lomqokeleli kwaye isekelwe ekongezeni imiyalelo ngumqambi xa uvelisa ikhowudi yomatshini. , ezifakwe phambi kwememori nganye efundwayo okanye ibhale umyalelo, kunye nangaphambi komyalelo wesebe lokuqala kwiqela lemiyalelo ephetha ibhloko.
Umyalelo we-LFENCE ulinda yonke inkumbulo yangaphambili ifundelwe ukwenza kwaye ikhubaze ukungahoywa kwemiyalelo elandelayo emva kwe-LFENCE de ukuzinikela kugqitywe. Ukusetyenziswa kwe-LFENCE kukhokelela ekunciphiseni okukhulu ekusebenzeni, ngoko ke ukukhuselwa kucetywayo ukuba kusetyenziswe kwiimeko ezinzima kakhulu kwikhowudi ebalulekileyo. Ukongeza kukhuseleko olupheleleyo, i-patch inika iiflegi ezintathu ezikuvumela ukuba ukhethe ukukhubaza amanqanaba athile okukhusela ukunciphisa impembelelo embi ekusebenzeni.
Kwiimvavanyo eziqhutywe, ukusetyenziswa kwe-SESES yokukhusela iphakheji ye-BoringSSL kukhokelele ekunciphiseni inani lemisebenzi ngomzuzwana eyenziwa lithala leencwadi ngamaxesha angama-14 - ukusebenza koguqulelo olukhuselweyo lwethala leencwadi kumyinge we-7.1% kuphela. inguqulo engakhuselekanga (ukwahluka kuxhomekeke kuvavanyo ukusuka kwi-4% ukuya kwi-23%).
Ukuthelekisa, Ngaphambili, kwi-GNU Assembler, i-mechanical eyenza indawo ye-LFENCE emva komsebenzi ngamnye womthwalo wememori kwaye ngaphambi kokuba eminye imiyalelo yesebe ibonise ukwehla komsebenzi malunga namaxesha e-5 (22% yekhowudi ngaphandle kokukhusela). Indlela yokukhusela nayo ΠΈ ziinjineli ze-Intel, kodwa iziphumo zovavanyo lokusebenza kwayo azikapapashwa. Ekuqaleni, abaphandi abachonga uhlaselo lwe-LVI baqikelele ukuhla kwe-2 ukuya kwi-19-fold xa besebenzisa ukhuseleko olupheleleyo.
umthombo: opennet.ru