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ぼくのかんがえたさいきょうCPU 2018 スカラ演算
houmei
April 23, 2018
Technology
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ぼくのかんがえたさいきょうCPU 2018 スカラ演算
houmei
April 23, 2018
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Transcript
΅͘ͷ͔Μ͕͑ͨ ͍͖͞ΐ͏CPU 2018.4.23 @houmei εΧϥԋࢉ 184݄23݄༵
༰ • ΅͘ͷ͔Μ͕͍͖͑ͨ͞ΐ͏CPUͷղઆ • ҟͳΔܕͷԋࢉʹ͍ͭͯʢεΧϥʣ twitter : @houmei blog :
ԼੈքౝͷܭࢉػΑ· 184݄23݄༵
ѻ͏ܕͱσʔλαΠζ ɾܕʢූ߸͋Γ/ූ߸ͳ͠ʣ ɾුಈখܕ ɾेਐුಈখܕ ͜ΕΒͷҟͳΔܕͱҟͳΔσʔλαΠζ Ͳ͏͠ͷԋࢉʹ͍ͭͯ 184݄23݄༵
ݪଇ (1)ԋࢉ݁ՌRdͷσʔλαΠζҰ൪ͷ ιʔε(Ra)ʹ߹ΘͤΔ (2)ԋࢉ݁ՌRdͷܕҰ൪ͷιʔε(Ra) ʹ߹ΘͤΔ ※(2)ྫ֎ : POPC/CLZ/CTZϏοτΛ ͑ΔͷͰRdܕ 184݄23݄༵
ιʔεͷܗࣜʁ Ұ൪ͷιʔεΛRaɺ ೋ൪Ҏ߱ͷιʔεΛRbͱ͢Δɿ ɾࢉज़ԋࢉ໋ྩɹRbRaʹ߹ΘͤΔ ɾཧԋࢉ໋ྩɹRbRaʹ߹ΘͤΔ ɾϏοτԋࢉ໋ྩɹRbͦͷ·· ɾγϑτ໋ྩɹRbͦͷ·· ※Rbʹࢦఆͨ͠ϨδελʹܕαΠζ ө͞Ε·ͤΜɻԋࢉ࣌ͷΈมɻ 184݄23݄༵
ͱʢ̍ʣ ɾRaͱRbͷαΠζ͕ಉ͡߹→ͳ͠ ɾRaΑΓRbͷαΠζ͕େ͖͍߹ ɹ→Rbͷ্ҐΛΧοτ͠ԋࢉ Ra Rb Rb’ Rd 184݄23݄༵
ͱʢ̎ʣ ɾRaΑΓRbͷαΠζ͕খ͍͞߹ ɹ→RbͷMSBΛූ߸֦ு͠ԋࢉ 1010111111110100 1111111111111111 1010111111110100 Ra Rb Rb’ Rd
184݄23݄༵
ͱʢ̏ʣ ɾRaΑΓRbͷαΠζ͕খ͍͞߹ ɹ→ԋࢉ໋ྩͷࢦࣔʹΑΓ( .u म০) ɹɹRbͷMSBΛθϩ֦ு͠ԋࢉ 1010111111110100 0000000000000000 1010111111110100 Ra
Rb Rb’ Rd 184݄23݄༵
ͷѻ͍ ɾͷූ߸ͳ͠/ූ߸͋Γ(̎ͷิ)ͷ ۠ผΛܕͰѻ͏͔ → ѻΘͳ͍ ɹैདྷͷϓϩηαͱͷޓੑҡ࣋ͷͨΊ ɾσϑΥϧτͰූ߸͖ͱͯ͠ѻ͏ ɾූ߸ͳ໋͠ྩͷम০ࢠ .u Ͱ໌ʹѻ͏
184݄23݄༵
ුಈখܕʢ̍ʣ ɾਫ਼͕ҟͳΔ߹ ɹ→Rbͷਫ਼ΛRaʹ߹ΘͤΔ ɾม࣌ͷΦʔόʔϑϩʔRfʹηοτ FP64 FP32 FP64 FP64 Ra Rb
Rb’ Rd 184݄23݄༵
ුಈখܕʢ̎ʣ ɾܕ͕ҟͳΔ߹ʢेਐුಈখࠞࡏʣ ɹ→Rbͷܕͱਫ਼ΛRaʹ߹ΘͤΔ ɾม࣌ͷΦʔόʔϑϩʔRfʹηοτ DP64 FP32 DP64 DP64 Ra Rb
Rb’ Rd 184݄23݄༵
ුಈখͱ ɾRa͕ුಈখܕɺRb͕ͷͱ͖ ɹ→RbΛRaͱಉ͡ුಈখܕͱαΠζ ʹม ɾม࣌ͷΦʔόʔϑϩʔRfʹηοτ FP32 Int 64bit FP32 FP32
Ra Rb Rb’ Rd 184݄23݄༵
ͱුಈখ ɾRa͕ɺRb͕ුಈখܕͷͱ͖ ɹ→RbΛRaͱಉ͡αΠζͷʹม ɾม࣌ͷΦʔόʔϑϩʔRfʹηοτ Int 64bit FP32 Int 64bit Int
64bit Ra Rb Rb’ Rd 184݄23݄༵
ؙΊ • ුಈখܕΛѻ͏ࢉज़ԋࢉ໋ྩʹम০ࢠͱ͠ ͯՃ • σϑΥϧτͷؙΊࢦࣔͱ̑छྨͷؙΊࢦఆ .rneɺ.rnaɺ.rzɺ.rpiɺ.pmi 184݄23݄༵
·ͱΊ • ԋࢉ݁ՌͷαΠζͱܕRaʹ߹ΘͤΔ • ԋࢉͷલʹRbͷαΠζͱܕΛRaʹ߹ΘͤΔ • ͕ූ߸͖/ූ߸ͳ͠ͷѻ͍ʢූ߸֦ுʣ ԋࢉ໋ྩʹͤΔ • ුಈখͷԋࢉมͷؙΊࢉज़ԋࢉ໋ྩ
Ͱѻ͏ 184݄23݄༵
ɹ ͭͮ͘ ΅͘ͷ͔Μ͕͍͖͑ͨ͞ΐ͏CPU 184݄23݄༵