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AMD64 Technology 24594 Rev. 3.10 February 2005CLCClear Carry FlagClears the carry flag (CF) in the rFLAGS register to zero.Mnemonic Opcode DescriptionCLC F8 Clear the carry flag (CF) to zero.Related InstructionsSTC, CMCrFLAGS AffectedID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CF21 20 19 18 17 16 14 13–12 11 10 9 8 7 6 4 2 0ExceptionsNoneNote: Bits 31–22, 15, 5, 3, and 1 are reserved. A flag set to 1 or cleared to 0 is M (modified). Unaffected flags are blank. Undefinedflags are U.098 CLC
24594 Rev. 3.10 February 2005 AMD64 TechnologyCLDClear Direction FlagClears the direction flag (DF) in the rFLAGS register to zero. If the DF flag is 0, eachiteration of a string instruction increments the data pointer (index registers rSI orrDI). If the DF flag is 1, the string instruction decrements the pointer. Use the CLDinstruction before a string instruction to make the data pointer increment.Mnemonic Opcode DescriptionCLD FC Clear the direction flag (DF) to zero.Related InstructionsCMPSx, INSx, LODSx, MOVSx, OUTSx, SCASx, STD, STOSxrFLAGS AffectedID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CF21 20 19 18 17 16 14 13–12 11 10 9 8 7 6 4 2 0ExceptionsNoneNote: Bits 31–22, 15, 5, 3, and 1 are reserved. A flag set to 1 or cleared to 0 is M (modified). Unaffected flags are blank. Undefinedflags are U.0CLD 99
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