Dotaz: Optimaliacia pre sempron

[komodo]

Zdravim

Vie mi niekto poradit aku nastavit optimalizaciu pre AMD Sempron ? je to ten najnovsi model, ktory vraj vychadza z athlonu64. Ale netusim co zvolit.V man gcc su tieto moznosti athlon, athlon-tbird, athlon-4, athlon-xp,athlon-mp. Doteraz som mal p3 takze s tym nebol problem ale tu fakt netusim.

Diky

Odpovědi

[hr]

Ono taktiez zalezi o aky sempron ide. Pretoze su dva typy sempronov jeden vychadza z jadra thorougbred a myslim ze s nim je prakticky identicky (ten je 32 bitovy) a druha varianta ma cisto nove jadro a je 64 bitova. athlon-tbird je stary athlon s jadrom thunderbird na sockete A a je to jeden s prvych athlonov pokial nepocitam athlony s jadrom pluto tie boli do slotu A. athlon-mp je v podstate athlon-xp ale ma navyse vlastnost ze dokaze bezat na viacprocesorovych doskach oproti athlonu-xp. athlon-xp zahrnuje athlony s jadrom palomino,thorougbred A0 a B0 , barton, thorton a takiez tebou zmienovany sempron (jeho 32 bitovu verziu). Pokial mas 64 bitovy procesor, poznas podla socketu bude bud 939 alebo 754 tak by som zvolil athlon-4. Ak mas 32 bitovy procesor (socket A) tak by som zvolil athlon-xp. Ta volba athlon by som odhadoval ze to bude univerzalna optimalizacia pre athlony bez blizsieho upresnenia .

[Ondra]

druha varianta ma cisto nove jadro a je 64 bitova

Aby to nebylo tak jednoduche, prvni Semprony pro sock 754 mely 64 bitove instrukce vypnute, tudiz chodily pouze v 32 bitovem rezimu.

[komodo]

no je to 32 bitovy sempron socket 754, takze ktory pouzit ?

[Michal Kubeček]

IMHO by to mělo být '-march=k8 -m32'

[komodo]

no tak podla toho to vyzera na ten athlon4

athlon, athlon-tbird
    AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and SSE prefetch instructions support.
athlon-4, athlon-xp, athlon-mp
    Improved AMD Athlon CPU with MMX, 3dNOW!, enhanced 3dNOW! and full SSE instruction set support.
k8, opteron, athlon64, athlon-fx
    AMD K8 core based CPUs with x86-64 instruction set support. (This supersets MMX, SSE, SSE2, 3dNOW!, enhanced 3dNOW! and 64-bit instruction set extensions.)

These -m switches are supported in addition to the above on AMD x86-64 processors in 64-bit environments.