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AMD64 Technology 24594 Rev. 3.10 February 2005rFLAGS AffectedID VIP VIF AC VM RF NT IOPL OF DF IF TF SF ZF AF PF CFExceptionsU U U U U M21 20 19 18 17 16 14 13–12 11 10 9 8 7 6 4 2 0Note: 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.Exception RealVirtual8086 Protected Cause of ExceptionStack, #SS X X X A memory address exceeded the stack segment limit or was noncanonical.General protection,#GPX X XA memory address exceeded a data segment limit or was non-canonical.X A null data segment was used to reference memory.Page fault, #PF X X A page fault resulted from the execution of the instruction.Alignment check, #AC X X An unaligned memory reference was performed while alignmentchecking was enabled.80 BT
24594 Rev. 3.10 February 2005 AMD64 TechnologyBTCBit Test and ComplementCopies a bit, specified by a bit index in a register or 8-bit immediate value (secondoperand), from a bit string (first operand), also called the bit base, to the carry flag(CF) of the rFLAGS register, and then complements (toggles) the bit in the bit string.If the bit base operand is a register, the instruction uses the modulo 16, 32, or 64(depending on the operand size) of the bit index to select a bit in the register.If the bit base operand is a memory location, bit 0 of the byte at the specified addressis the bit base of the bit string. If the bit index is in a register, the instruction selects abit position relative to the bit base in the range –2 63 to +2 63 – 1 if the operand size is64, –2 31 to +2 31 – 1, if the operand size is 32, and –2 15 to +2 15 – 1 if the operand size is16. If the bit index is in an immediate value, the bit selected is that value modulo 16,32, or 64, depending the operand size.This instruction is useful for implementing semaphores in concurrent operatingsystems. Such an application should precede this instruction with the LOCK prefix.For details about the LOCK prefix, see “Lock Prefix” on page 10.Mnemonic Opcode DescriptionBTC reg/mem16, reg16 0F BB /rBTC reg/mem32, reg32 0F BB /rBTC reg/mem64, reg64 0F BB /rBTC reg/mem16, imm80F BA /7 ibBTC reg/mem32, imm80F BA /7 ibBTC reg/mem64, imm80F BA /7 ibCopy the value of the selected bit to the carry flag, thencomplement the selected bit.Copy the value of the selected bit to the carry flag, thencomplement the selected bit.Copy the value of the selected bit to the carry flag, thencomplement the selected bit.Copy the value of the selected bit to the carry flag, thencomplement the selected bit.Copy the value of the selected bit to the carry flag, thencomplement the selected bit.Copy the value of the selected bit to the carry flag, thencomplement the selected bit.Related InstructionsBT, BTR, BTSBTC 81
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