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~The Assembly~ directly controlling CPU kumaGoro

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OutLine 1. What is the Assembly Language? 2. Its features 3. The benefit using the Assembly

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1. What is the Assembly Language?

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In Simple Words... The most nearest language to “Machine Language” 
 　 ・The LG to control CPU ・Written in Bytecode(10010...)

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2. How this language works?

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The features 1. Control CPU by yourself 2. One Line, One Instruction 3. It differs from the type of CPUs 　

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1. Control CPU by yourself If we do “20 + 30” in Java… int result = 20 + 30; I save it in the Address No.xx in the memory. → Computers automatically choose the Address for the result.

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How about the Assembly?

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“Registers” & “Main Memory” A data storage outside the CPU A small storage inside the CPU ↓ ↓

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I want to add 20 to 30... When people use the Assembly...

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I put 20 on “eax” & 30 on “ebx”! 20 30 When people use the Assembly...

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CPU, please do calculation! 20 30 Answer is 50!

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I want to store the result... = 50 →　Coder must control CPU by yourself! I put on the Address No.1!

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The features 1. Control CPU by yourself 2. One Line, One Instruction 3. It differs from the type of CPUs 　

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2. One Line, One Instruction Instruction? Loading data Adding numbers Copying data

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2. One Line, One Instruction int x = 10 + 20; Looks like 1 Instruction...

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2. One Line, One Instruction int x = 10 + 20; ↑ putting number on the memory adding numbers ↓ Several Instructions! Initializing the variable ↓

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How About Assembly…? mov eax , 10 ↑ Opecode (Instruction) ↑ Operand(target of Instruction) (Address,Data)

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”0011” ⇔ ”LD” called “Mnemonic” Simply replacing! Machine Code ⇔ Assembly ex) Loading Data Instruction

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How About Assembly…? xor eax, eax xor ebx, ebx mov eax, 20 mov ebx, 30 add eax, ebx ← Initializing register “eax” ← Copying 20 to “eax” ← Copying 30 to “ebx” ← Adding eax(20) to ebx(30) One line, One Instruction! ← Initializing register “ebx” “20 + 30”

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The features 1. Control CPU by yourself 2. One Line, One Instruction 3. It differs from the type of CPUs 　

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3. It differs from the type of CPUs Intel AMD etc...

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But, Why? A, Opecodes & Types of Registers differs from the type of CPUs → There are more 50 types of Assembly!

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3. The benefit Using Assembly

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The assembly is... ・ Coder have to think about Registers & Memory ・ In addition, they have to write instructions one by one 　 →　Really inconvenient! 　　　Why people use the Assembly?

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Why people use the Assembly? A. “High Speed Processing”　

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For What purpose is the Assembly used? ● in the past… Used for Computers(CPUs of these days were low-spec ...) ● Now... Used for IoT! (Many electrical appliances have microcomputers) →　I thought the Assembly is old-fashioned, 　　　　　　　　but still necessary for innovation!

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Thank you for listening!