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AMD64 Technology 24594 Rev. 3.10 February 2005PUSHF_VIRTUAL:IF (RFLAGS.IOPL=3){PUSH.v old_RFLAGS // Pushed with RF,VM cleared.EXIT}ELSIF ((CR4.VME=1) && (OPERAND_SIZE=16)){PUSH.v old_RFLAGS // Pushed with VIF in the IF position.// Pushed with IOPL=3.EXIT}ELSE // ((RFLAGS.IOPL
24594 Rev. 3.10 February 2005 AMD64 TechnologyRCLRotate Through Carry LeftRotates the bits of a register or memory location (first operand) to the left (moresignificant bit positions) and through the carry flag by the number of bit positions inan unsigned immediate value or the CL register (second operand). The bits rotatedthrough the carry flag are rotated back in at the right end (lsb) of the first operandlocation.The processor masks the upper three bits of the count operand, thus restricting thecount to a number between 0 and 31. When the destination is 64 bits wide, theprocessor masks the upper two bits of the count, providing a count in the range of 0 to63.For 1-bit rotates, the instruction sets the OF flag to the exclusive OR of the CF bit(after the rotate) and the most significant bit of the result. When the rotate count isgreater than 1, the OF flag is undefined. When the rotate count is 0, no flags areaffected.Mnemonic Opcode DescriptionRCL reg/mem8,1 D0 /2RCL reg/mem8, CL D2 /2RCL reg/mem8, imm8C0 /2 ibRCL reg/mem16, 1 D1 /2RCL reg/mem16, CL D3 /2RCL reg/mem16, imm8C1 /2 ibRCL reg/mem32, 1 D1 /2Rotate the 9 bits consisting of the carry flag and an 8-bit registeror memory location left 1 bit.Rotate the 9 bits consisting of the carry flag and an 8-bit registeror memory location left the number of bits specified in the CLregister.Rotate the 9 bits consisting of the carry flag and an 8-bit registeror memory location left the number of bits specified by an 8-bitimmediate value.Rotate the 17 bits consisting of the carry flag and a 16-bit registeror memory location left 1 bit.Rotate the17 bits consisting of the carry flag and a 16-bit registeror memory location left the number of bits specified in the CLregister.Rotate the 17 bits consisting of the carry flag and a 16-bit registeror memory location left the number of bits specified by an 8-bitimmediate value.Rotate the 33 bits consisting of the carry flag and a 32-bit registeror memory location left 1 bit.RCL 239
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