CPUとは何か / What's a CPU

௕୩઒ஐر $16ͱ͸Կ͔

௕୩઒ஐر !UPN[PI

ϥΠϑϫʔΫ ςοΫΧϯϑΝϨϯεӡӦࢀՃ 8FCJ04ΞϓϦ։ൃ Ϗʔϧ $16 ϨτϩήʔϜػ ిࢠ޻࡞  
αοΧʔ؍ઓ   ϨϯλϧΧʔτϨʔε ʜ σδλϧαʔΧεגࣜձࣾ ෭ஂ௕$50 !UPN[PI

8FC%FWFMPQNFOUXJUI 8&"3&)*3*/( IUUQXXXEHDJSDVTDPN ౦ژදࢀಓ

೥݄೔ʢ೔ʣʙ೔ʢՐ ɾॕʣ εϙϯαʔืूதʂʂ   ։࠵ܾఆ

ࠓ೔ͷςʔϚ

௕୩઒ஐر $16ͱ͸Կ͔

௕୩઒ஐر $16ͱ͸Կ͔ ʘͭͷࢹ఺͔Βݟͨ$16ʗ

୊ࡐ$16

୊ࡐ$16 5%

ॻ੶$16ͷ૑Γ͔ͨ

ॻ੶$16ͷ૑Γ͔ͨ ʘ໊ஶʗ

Ͱ͸ૣ଎ʜ

ϓϩάϥϜ࣮ߦ؀ڥ ࢹ఺ ͱͯ͠ͷ$16

Έͳ͞Μ͓ೃછΈ

ϓϩάϥϜ࣮ߦ؀ڥͱͯ͠ͷ$16 wϚγϯޠϓϩάϥϜͷ࣮ߦ؀ڥ

ϓϩάϥϜ࣮ߦ؀ڥͱͯ͠ͷ$16 wϚγϯޠϓϩάϥϜͷ࣮ߦ؀ڥ wVTSCJOQIQϚγϯޠϓϩάϥϜ

ϓϩάϥϜ࣮ߦ؀ڥͱͯ͠ͷ$16 wϚγϯޠϓϩάϥϜͷ࣮ߦ؀ڥ wVTSCJOQIQϚγϯޠϓϩάϥϜ w$ݴޠ‎χʔϞχοΫ‎Ϛγϯޠ ίϯύΠϧ Ξηϯϒϧ

ϓϩάϥϜ࣮ߦ؀ڥͱͯ͠$16 Λݟͨ࣌ͷߟ͑ํ

ϓϩάϥϜ࣮ߦ؀ڥͱͯ͠$16 wϓϩάϥϜΛ࣮ߦͯ͘͠ΕΔଘࡏ Λݟͨ࣌ͷߟ͑ํ

ϓϩάϥϜ࣮ߦ؀ڥͱͯ͠$16 wϓϩάϥϜΛ࣮ߦͯ͘͠ΕΔଘࡏ Λݟͨ࣌ͷߟ͑ํ wࣗ෼ͷ࢖͏ػೳͷΈͷཧղͰ0,  ʢ͢΂ͯͷ໋ྩɾ࢓༷Λ஌Δඞཁ͸ແ͍ʣ

$16ͱ͸Կ͔ ̘̥̪

ΤϛϡϨʔτର৅ ࢹ఺ ͱͯ͠ͷ$16

ΤϛϡϨʔτର৅ͱͯ͠ͷ$16 wΤϛϡϨʔλͷ$16෦෼

ΤϛϡϨʔτର৅ͱͯ͠ͷ$16 w$16ͷ;Δ·͍Λιϑτ΢ΣΞͱͯ͠ ࣮૷ wΤϛϡϨʔλͷ$16෦෼

1)1Ͱ࣮૷ͯ͠ΈΔ

5%ͷϚγϯޠ Y

5%ͷϚγϯޠ 0QDPEF *Nʢ0QFSBOE
Y

Y "%%" *N

Y "Ϩδελʹ*Nͷ஋Λ଍͢ "%%" *N

Y "" "Ϩδελʹ*Nͷ஋Λ଍͢ "%%" *N

public function executeInstruction() {

public function executeInstruction() { $byte = $this->ram[$this->pc];

public function executeInstruction() { $byte = $this->ram[$this->pc]; 0QDPEF
*Nʢ0QFSBOE

$opcode = $byte >> 4; $im = $byte & 0b00001111;
public function executeInstruction() { $byte = $this->ram[$this->pc]; 0QDPEF *Nʢ0QFSBOE

public function executeInstruction() { switch ($opcode){ case 0b0000: // ADD A, Im $this->a += $im; break; case 0b0001: } $byte = $this->ram[$this->pc];

public function executeInstruction() { switch ($opcode){ case 0b0000: // ADD A, Im $this->a += $im; break; case 0b0001: } $this->pc++; } $byte = $this->ram[$this->pc];

ΤϛϡϨʔτର৅ͱͯ͠$16 Λݟͨ࣌ͷߟ͑ํ

ΤϛϡϨʔτର৅ͱͯ͠$16 Λݟͨ࣌ͷߟ͑ํ wର৅$16༻ʹॻ͔Εͨ  શͯͷϓϩάϥϜΛಈ࡞ͤ͞Δଘࡏ

ΤϛϡϨʔτର৅ͱͯ͠$16 w$16࢓༷ͷ׬શͳཧղ Λݟͨ࣌ͷߟ͑ํ wର৅$16༻ʹॻ͔Εͨ  શͯͷϓϩάϥϜΛಈ࡞ͤ͞Δଘࡏ

$16ͱ͸Կ͔ ̘̥̪

ిؾճ࿏ ࢹ఺ ͱͯ͠ͷ$16

$16Λϋʔυ΢ΣΞͱ࣮ͯ͠૷  ͢Δ৔߹ͷߟ͑ํ

5%ͷ$16໋ྩ

Կ͔ͱԿ͔Λ଍ͯ͠  Ͳ͔͜ʹసૹ͢Δ 5%ͷ$16໋ྩ

ԿͱԿΛ଍ͯ͠Ͳ͜ʹసૹ͢Δ͔ */ ϙʔτ " Ϩδελ # Ϩδελ 065 ϙʔτ 1$
Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ

*/ ϙʔτ " Ϩδελ # Ϩδελ 065 ϙʔτ 1$ Ϩδελ
Ճࢉػ ϝϞϦ ηϨΫλ ԿͱԿΛ଍ͯ͠Ͳ͜ʹసૹ͢Δ͔

*/ ϙʔτ " Ϩδελ # Ϩδελ 065 ϙʔτ 1$ Ϩδελ
Ճࢉػ ϝϞϦ ηϨΫλ 0QDPEF *Nʢ0QFSBOE ԿͱԿΛ଍ͯ͠Ͳ͜ʹసૹ͢Δ͔

*/ ϙʔτ ԼҐCJU " Ϩδελ # Ϩδελ 065 ϙʔτ 1$
Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ 0QDPEF *Nʢ0QFSBOE ԿͱԿΛ଍ͯ͠Ͳ͜ʹసૹ͢Δ͔

*/ ϙʔτ ԼҐCJU " Ϩδελ # Ϩδελ 065 ϙʔτ 1$
Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ ԿͱԿΛ଍ͯ͠Ͳ͜ʹసૹ͢Δ͔

ԿͱԿΛ଍ͯ͠Ͳ͜ʹసૹ͢Δ͔ */ ϙʔτ ԼҐCJU " Ϩδελ # Ϩδελ 065 ϙʔτ
1$ Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ

1$ Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ ͦΕΛͲ͏ܾΊΔʁ

1$ Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ ͦΕΛͲ͏ܾΊΔʁ ͦΕ໋͕ͦ͜ྩͳͷͩʂ

1$ Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ ͦΕΛͲ͏ܾΊΔʁ ͦΕ໋͕ͦ͜ྩͳͷͩʂ 0QDPEF *Nʢ0QFSBOE

1$ Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ 0QDPEF *Nʢ0QFSBOE

ԿͱԿΛ଍ͯ͠Ͳ͜ʹసૹ͢Δ͔ ্ҐCJU */ ϙʔτ ԼҐCJU " Ϩδελ # Ϩδελ 065
ϙʔτ 1$ Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ 0QDPEF *Nʢ0QFSBOE

্ҐCJU */ ϙʔτ ԼҐCJU " Ϩδελ # Ϩδελ 065 ϙʔτ
1$ Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ

্ҐCJU */ ϙʔτ ԼҐCJU " Ϩδελ # Ϩδελ 065 ϙʔτ
1$ Ϩδελ Ճࢉػ ϝϞϦ ηϨΫλ ΫϩοΫ

ిؾճ࿏ͱͯ͠$16 Λݟͨ࣌ͷߟ͑ํ

ిؾճ࿏ͱͯ͠$16 wΫϩοΫʹैͬͯঢ়ଶભҠ͢Δճ࿏ͱͯ͠ $16໋ྩΛදݱͨ͠ଘࡏ Λݟͨ࣌ͷߟ͑ํ

ిؾճ࿏ͱͯ͠$16 wΫϩοΫʹैͬͯঢ়ଶભҠ͢Δճ࿏ͱͯ͠ $16໋ྩΛදݱͨ͠ଘࡏ Λݟͨ࣌ͷߟ͑ํ w࢓༷ͱ෺ཧͷύζϧΛղ͍ͯ$16࢓༷Λ ࡞Δ

$16ͱ͸Կ͔ ̘̥̪

·ͱΊ

·ͱΊ w$16ͱݴͬͯ΋ͲΜͳཱ৔ͰͦΕΛ  ݟΔ͔ʹΑͬͯݟ͑ํ͕ҧ͏ʂ

·ͱΊ w$16ͱݴͬͯ΋ͲΜͳཱ৔ͰͦΕΛ  ݟΔ͔ʹΑͬͯݟ͑ํ͕ҧ͏ʂ wΤϛϡϨʔλ͸೉͍͠΋ͷͰ͸ͳ͍Ͷʂ

·ͱΊ w$16ͱݴͬͯ΋ͲΜͳཱ৔ͰͦΕΛ  ݟΔ͔ʹΑͬͯݟ͑ํ͕ҧ͏ʂ wΤϛϡϨʔλ͸೉͍͠΋ͷͰ͸ͳ͍Ͷʂ w$16ࣗ࡞΋໘ന͍Αʂ

·ͱΊ w$16ͱݴͬͯ΋ͲΜͳཱ৔ͰͦΕΛ  ݟΔ͔ʹΑͬͯݟ͑ํ͕ҧ͏ʂ wΤϛϡϨʔλ͸೉͍͠΋ͷͰ͸ͳ͍Ͷʂ w$16ࣗ࡞΋໘ന͍Αʂ w΍ͬͯΈΑ͏ʂ

͖͍࣋ͬͯͯΔͷͰ ࠙਌ձͱ͔Ͱ੠͔͚͍ͯͩ͘͞

͓ΘΓ !UPN[PI

༨ஊ

8IBUNBLFXJUI1)1

5%ͷϓϩάϥϜ

ϚγϯޠͰॻ͔ΕͨϓϩάϥϜ

ϚγϯޠͰॻ͔ΕͨϓϩάϥϜ YG

Y .07" "ϨδελʹΛసૹ Y "%%" "ϨδελʹΛ଍͢
Y .07# " #Ϩδελʹ"Ϩδελͷ ஋Λసૹ Y 065# #Ϩδελͷ஋Λ*0  ϙʔτʹग़ྗ Y G +.1Y Yʹδϟϯϓ ϚγϯޠͰॻ͔ΕͨϓϩάϥϜ

$16ͷ૑Γ͔ͨ ʘ໊ஶʗ

IUUQTXXXBNB[PODPKQEQ

5%ͷ໋ྩ͸શͯ  ଍͠ࢉసૹ

Y "Ϩδελʹ*Nͷ஋Λ଍͢ "%%" *N

Y "" "Ϩδελʹ*Nͷ஋Λ଍͢ "%%" *N

Y "Ϩδελʹ#Ϩδελͷ஋Λ  సૹ͢Δ .07" #

Y "# "Ϩδελʹ#Ϩδελͷ஋Λ  సૹ͢Δ .07" #

5%ͷ໋ྩηοτ

Ϛγϯޠ ໋ྩ ʢχʔϞχοΫʣ ಈ࡞ 0QDPEF ʢਐʣ 0QDPEF ʢਐʣ "%%" *N
"Ϩδελʹ*NΛ଍͢ C Y .07" # #Ϩδελͷ஋Λ"Ϩδελʹసૹ͢Δ C Y */" *0ϙʔτ͔Β"Ϩδελʹ஋ΛಡΈࠐΉ C Y .07" *N "Ϩδελʹ*Nͷ஋Λసૹ͢Δ C Y +.1*N *Nʹδϟϯϓ͢Δ C YG

Ϛγϯޠ ໋ྩ ʢχʔϞχοΫʣ ಈ࡞ 0QDPEF ʢਐʣ 0QDPEF ʢਐʣ "%%" *N
"Ϩδελʹ*NΛ଍͢ C Y .07" # #Ϩδελͷ஋Λ"Ϩδελʹసૹ͢Δ C Y */" *0ϙʔτ͔Β"Ϩδελʹ஋ΛಡΈࠐΉ C Y .07" *N "Ϩδελʹ*Nͷ஋Λసૹ͢Δ C Y +.1*N *Nʹδϟϯϓ͢Δ C YG શ໋ྩ

$16ͷΤϛϡϨʔλ࣮૷  ʙॳظԽฤʙ

class Cpu { public function __construct() { $this->ram = array_fill(0,
0b1111, 0); $this->pc = $this->a = $this->b = 0; } private $ram; private $pc; private $a; private $b; $16ͷΫϥεఆٛͱॳظԽ

͓ΘΓ !UPN[PI

CPUとは何か / What's a CPU

CPUとは何か / What's a CPU

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