Volume 3: General-Purpose and System Instructions - Stanford ...

AMD64 Technology 24594 Rev. 3.10 February 2005RSVVRWXYabddqppdpipsqssdGeneral purpose register specified by the ModRM r/mfield. The ModRM mod field must be 11b.Segment register specified by the ModRM reg field.128-bit XMM register specified by the ModRM reg field.128-bit XMM register specified by the ModRM r/m field.The ModRM mod field must be 11b.A 128-bit XMM register or memory operand specified bythe ModRM byte. Memory addresses can be computedfrom a segment register, SIB byte, and/or displacement.A memory operand addressed by the DS.rSI registers. Usedin string instructions.A memory operand addressed by the ES.rDI registers.Used in string instructions.Two 16-bit or 32-bit memory operands, depending on theeffective operand size. Used in the BOUND instruction.A byte, irrespective of the effective operand size.A doubleword (32 bits), irrespective of the effectiveoperand size.A double-quadword (128 bits), irrespective of the effectiveoperand size.A 32-bit or 48-bit far pointer, depending on the effectiveoperand size.A 128-bit double-precision floating-point vector operand(packed double).A 64-bit MMX operand (packed integer).A 128-bit single-precision floating-point vector operand(packed single).A quadword, irrespective of the effective operand size.A 6-byte or 10-byte pseudo-descriptor.A scalar double-precision floating-point operand (scalardouble).376 Appendix A: Opcode and Operand Encodings