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AMD64 Technology 24594 Rev. 3.10 February 2005Table B-1.Operations and Operands in 64-Bit Mode (continued)SUB—Subtract292B2D81 /583 /5SWAPGS—Swap GS Register withKernelGSbase MSR0F 01 /7SYSCALL—Fast System Call0F 05SYSENTER—System Call0F 34SYSEXIT—System Return0F 35SYSRET—Fast System Return0F 07Instruction andOpcode (hex) 1Type ofOperation 2Promoted to64 bits.Newinstruction,availableonly in 64-bitmode. (Inother modes,this opcodeis invalid.)Promoted to64 bits.Promoted to64 bits.DefaultOperandSize 332 bitsNot relevant.Not relevant.Zero-extends 32-bit register resultsto 64 bits.See “SWAPGS Instruction” inVolume 2.See “SYSCALL and SYSRETInstructions” in Volume 2 for details.INVALID IN LONG MODE (invalid-opcode exception)INVALID IN LONG MODE (invalid-opcode exception)32 bitsFor 32-BitOperand Size 4For 64-BitOperand Size 4See “SYSCALL and SYSRETInstructions” in Volume 2 for details.Note:1. See “General Rules for 64-Bit Mode” on page 413, for opcodes that do not appear in this table.2. The type of operation, excluding considerations of operand size or extension of results. See “General Rules for 64-Bit Mode” onpage 413 for definitions of “Promoted to 64 bits” and related topics.3. If “Type of Operation” is 64 bits, a REX prefix is needed for 64-bit operand size, unless the instruction size defaults to 64 bits. Ifthe operand size is fixed, operand-size overrides are silently ignored.4. Special actions in 64-bit mode, in addition to legacy-mode actions. Zero or sign extensions apply only to result operands, notsource operands. Unless otherwise stated, 8-bit and 16-bit results leave the high 56 or 48 bits, respectively, of 64-bit destinationregisters unchanged. Immediates and branch displacements are sign-extended to 64 bits.5. Any pointer registers (rDI, rSI) or count registers (rCX) are address-sized and default to 64 bits. For 32-bit address size, any pointerand count registers are zero-extended to 64 bits.6. The default operand size can be overridden to 16 bits with 66h prefix, but there is no 32-bit operand-size override in 64-bit mode.442 Appendix B: General-Purpose Instructions in 64-Bit Mode
24594 Rev. 3.10 February 2005 AMD64 TechnologyTable B-1.Operations and Operands in 64-Bit Mode (continued)Instruction andOpcode (hex) 1Type ofOperation 2DefaultOperandSize 3For 32-BitOperand Size 4For 64-BitOperand Size 4TEST—Test Bits85A9F7 /0Promoted to64 bits.32 bits No GPR register results.UD2—Undefined Operation0F 0BSame aslegacy mode.Not relevant.No GPR register results.VERR—Verify Segment for Reads0F 00 /4Same aslegacy mode.Operand sizefixed at 16bitsNo GPR register results.VERW—Verify Segment for Writes0F 00 /5Same aslegacy mode.Operand sizefixed at 16bitsNo GPR register results.WAIT—Wait for Interrupt9BSame aslegacy mode.Not relevant.No GPR register results.WBINVD—Writeback and Invalidate AllCaches0F 09Same aslegacy mode.Not relevant.No GPR register results.WRMSR—Write to Model-Specific Register0F 30Same aslegacy mode.Not relevant.No GPR register results.MSR[63:32] = RDX[31:0]MSR[31:0] = RAX[31:0]Note:1. See “General Rules for 64-Bit Mode” on page 413, for opcodes that do not appear in this table.2. The type of operation, excluding considerations of operand size or extension of results. See “General Rules for 64-Bit Mode” onpage 413 for definitions of “Promoted to 64 bits” and related topics.3. If “Type of Operation” is 64 bits, a REX prefix is needed for 64-bit operand size, unless the instruction size defaults to 64 bits. Ifthe operand size is fixed, operand-size overrides are silently ignored.4. Special actions in 64-bit mode, in addition to legacy-mode actions. Zero or sign extensions apply only to result operands, notsource operands. Unless otherwise stated, 8-bit and 16-bit results leave the high 56 or 48 bits, respectively, of 64-bit destinationregisters unchanged. Immediates and branch displacements are sign-extended to 64 bits.5. Any pointer registers (rDI, rSI) or count registers (rCX) are address-sized and default to 64 bits. For 32-bit address size, any pointerand count registers are zero-extended to 64 bits.6. The default operand size can be overridden to 16 bits with 66h prefix, but there is no 32-bit operand-size override in 64-bit mode.Appendix B: General-Purpose Instructions in 64-Bit Mode 443
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