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houmei
March 06, 2018
Technology
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2018-BKSC-ALU
ぼくのかんがえたさいきょうCPU 2018 ALU
houmei
March 06, 2018
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Transcript
΅͘ͷ͔Μ͕͑ͨ ͍͖͞ΐ͏CPU 2018.3.6 @houmei ALU
༰ • ΅͘ͷ͔Μ͕͍͖͑ͨ͞ΐ͏CPUͷղઆ • ཧԋࢉஔ(ALU)ʹ͍ͭͯ twitter : @houmei blog :
ԼੈքౝͷܭࢉػΑ·
ALUͷߏ
ALUͷೖग़ྗ(1) • Ra,Rb(,Rb’...) σʔλೖྗ • Rc ԋࢉछྨͷࢦࣔ • Rd ԋࢉ݁Ռग़ྗ
• Re ԋࢉ݁Ռ༧උग़ྗ • Rf ԋࢉ݁Ռϑϥά
ALUͷೖग़ྗ(2) • ೖྗRa,Rbͱग़ྗRd,Reಉ͡bit෯ • 3Ҿͷԋࢉ(ੵԋࢉͳͲ)Rb’Λ༻ • ࢉͷ݁Ռ2ഒͷbit෯ʹͳΔͷͰRd,Reʹ ग़ྗ • আࢉͷRdʹɺ༨Reʹग़ྗ
ALUͷೖग़ྗ(3) • RcԋࢉͷछྨɺؙΊͳͲΛࢦఆɻ8bit෯ • Rfԋࢉ݁Ռͷঢ়ଶΛग़ྗɻ8bit෯ • ݅ذ໋ྩલͷԋࢉ໋ྩͷRfΛࢀর͢Δ
ԋࢉͷछྨ • ࢉज़ԋࢉɹRa,Rb,Rd,Re(/ුಈখ) • ཧԋࢉɹRa,Rb,Rdbitྻ(Reແޮ) • bitૢ࡞ɹRabitྻɺRbɺRdbitྻɹɹ ―γϑτ໋ྩͳͲ • bitใɹRabitྻɺ(Rbɺ)Rdɹ
―POPC໋ྩͳͲ
ࢉज़ԋࢉ • Ճࢉ/ݮࢉ • ࢉ/ੵԋࢉ • আࢉ/ฏํࠜ • ઈର/ූ߸స •
࠷େ/࠷খ
ཧԋࢉ • RaͱRbͷAND/OR/XOR • Raͷస(NOT) • Ra/Rb/all0ͷબ • ग़ྗͷస(NOT)ɹɹɹɹɹɹɹɹɹɹɹɹɹ ―͜ΕͰͯ͢ΧόʔͰ͖Δ
Ϗοτૢ࡞ • ӈγϑτ/ࠨγϑτ/ࢉज़ӈγϑτ/ࠨճసɹ ―RbྔΛࢦఆ • INSERT/EXTRACTɹɹɹɹɹɹɹɹɹɹɹ ―RbҐஔΛࢦఆ • bitSwapɹ8bitͰҙbitͷೖΕ͑ɹɹɹɹ ―RbύλʔϯΛࢦఆ
Ϗοτใ • POPCɹRaͷ“1”ͷΛΧϯτ • CLZ Count Leading Zero MSB͔Β࿈ଓ͢Δ0ͷ •
CTZ Count Trairing Zero LSB͔Β࿈ଓ͢Δ0ͷ
ϑϥά • ԋࢉ݁Ռͷঢ়ଶΛࣔ͢ • Φʔόʔϑϩʔͷ༗ແ • ݮࢉ࣌ͷRa,Rbͷେখؔɹ→ޙͷذ໋ྩ • ҾͷΤϥʔ(γϑτ໋ྩͷγϑτྔ͕ුಈখ)
ɹ ͭͮ͘ ΅͘ͷ͔Μ͕͍͖͑ͨ͞ΐ͏CPU