AMD x86-64 Architecture Programmer's Manual, Volume 4, 128-Bit ...

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AMD64 Technology 26568—Rev. 3.05—September 2003 IGN Ignore. Field is ignored. indirect Referencing a memory location whose address is in a register or other memory location. The address may be an absolute or relative address. Compare direct. IRB The virtual-8086 mode interrupt-redirection bitmap. IST The long-mode interrupt-stack table. IVT The real-address mode interrupt-vector table. LDT Local descriptor table. legacy x86 The legacy x86 architecture. See “Related Documents” on page xxv for descriptions of the legacy x86 architecture. legacy mode An operating mode of the AMD64 architecture in which existing 16-bit and 32-bit applications and operating systems run without modification. A processor implementation of the AMD64 architecture can run in either long mode or legacy mode. Legacy mode has three submodes, real mode, protected mode, and virtual-8086 mode. long mode An operating mode unique to the AMD64 architecture. A processor implementation of the AMD64 architecture can run in either long mode or legacy mode. Long mode has two submodes, 64-bit mode and compatibility mode. lsb Least-significant bit. LSB Least-significant byte. xviii Preface
26568—Rev. 3.05—September 2003 AMD64 Technology main memory Physical memory, such as RAM and ROM (but not cache memory) that is installed in a particular computer system. mask (1) A control bit that prevents the occurrence of a floatingpoint exception from invoking an exception-handling routine. (2) A field of bits used for a control purpose. MBZ Must be zero. If software attempts to set an MBZ bit to 1, a general-protection exception (#GP) occurs. memory Unless otherwise specified, main memory. ModRM A byte following an instruction opcode that specifies address calculation based on mode (Mod), register (R), and memory (M) variables. moffset A 16, 32, or 64-bit offset that specifies a memory operand directly without using a ModRM or SIB byte. msb Most-significant bit. MSB Most-significant byte. multimedia instructions A combination of 128-bit media instructions and 64-bit media instructions. octword Same as double quadword. offset Same as displacement. overflow The condition in which a floating-point number is larger in magnitude than the largest, finite, positive or negative Preface xix
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