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Chapter 9 the 8088 instruction set vi - shift instructions

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Dwight Sabio
Dwight Sabio

This document discusses shift instructions in the 8088 instruction set, including SHL/SAL for shifting bits left while filling vacated right bits with zeros, SHR for shifting bits right and filling vacated left bits with zeros, and SAR for shifting bits right and filling vacated left bits with the most significant bit. All three shift instructions affect the CF, OF, PF, SF, and ZF flags, while the AF flag is undefined.

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Assembly Language Programming Chapter 9 The 8088 Instruction Set VI Shift Instructions
SHL/SAL Meaning Format Operation Flags Affected Shift Logical Left/ Shift Arithmetic Left SHL D, count SAL D, count Shift the destination to the left by the number of bit positions equal to Count and fill the vacated bits positions on the right with 0’s CF, OF, PF, SF, ZF AF is undefined
SHR Meaning Format Operation Flags Affected Shift Logical Right SHR D, count Shift the destination to the right by the number of bit positions equal to Count and fill the vacated bits positions on the left with 0’s CF, OF, PF, SF, ZF AF is undefined
SAR Meaning Format Operation Flags Affected Shift Arithmetic Right SAR D, count Shift the destination to the right by the number of bit positions equal to Count and fill the vacated bits positions on the left with the most significant bit CF, OF, PF, SF, ZF AF is undefined

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Chapter 9 the 8088 instruction set vi - shift instructions

  • 1. Assembly Language Programming Chapter 9 The 8088 Instruction Set VI Shift Instructions
  • 2. SHL/SAL Meaning Format Operation Flags Affected Shift Logical Left/ Shift Arithmetic Left SHL D, count SAL D, count Shift the destination to the left by the number of bit positions equal to Count and fill the vacated bits positions on the right with 0’s CF, OF, PF, SF, ZF AF is undefined
  • 3. SHR Meaning Format Operation Flags Affected Shift Logical Right SHR D, count Shift the destination to the right by the number of bit positions equal to Count and fill the vacated bits positions on the left with 0’s CF, OF, PF, SF, ZF AF is undefined
  • 4. SAR Meaning Format Operation Flags Affected Shift Arithmetic Right SAR D, count Shift the destination to the right by the number of bit positions equal to Count and fill the vacated bits positions on the left with the most significant bit CF, OF, PF, SF, ZF AF is undefined