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Chapter 9:

Chapter 9:. 22342 – Computer Organization & Assembly Language. Strings & Arrays. String Operands. String Operands Defaults Byte, Word or Double Element Size DS:SI Points to Source String ES:DI Points to Destination String Register Use is Limited to AL & AX

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Chapter 9:

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  1. Chapter 9: 22342 – Computer Organization & Assembly Language Strings & Arrays

  2. String Operands • String Operands Defaults • Byte, Word or Double Element Size • DS:SI Points to Source String • ES:DI Points to Destination String • Register Use is Limited to AL & AX • Auto Increment or Decrement of the Index (Pointer)

  3. String Operations • String Transfer Operations • MOVS (Byte or Word)

  4. String Operations • String Transfer Operations • LODS (Byte or Word)

  5. String Operations • String Transfer Operations • STOS (Byte or Word)

  6. Repeated String Operations • Repeated String Transfers • REP, REPZ, REPNZ (REPE, REPNE) Example:

  7. Repeated String Operations Example: Copy String

  8. Repeated String Operations Example: Convert to Lower Case

  9. Repeated String Operations Example: B[i] = – A[i]

  10. String Comparison • Compare Two Strings • CMPS (Byte or Word) Example:Find the First Mismatch

  11. String Search • Scan Destination String • SCAS (Byte or Word) Example:Search for the Letter ‘a’

  12. Chapter 9

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