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Intel® Extended Memory 64 Technology Software Developer's Guide

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F2XM1—Compute 2 x –1Opcode Instruction <strong>64</strong>-Bit Mode Compat/Leg DescriptionModeD9 F0 F2XM1 Valid Valid Replace ST(0) with (2 ST(0) – 1)FPU Flags AffectedC1Set to 0 if stack underflow occurred.Indicates rounding direction if the inexact-result exception (#P) is generated: 0 ← notroundup; 1 ← roundup.C0, C2, C3 Undefined.IA-32e Mode OperationSame as legacy mode.Floating-Point Exceptions#ISStack underflow occurred.#IASource operand is an SNaN value or unsupported format.#D Result is a denormal value.#U Result is too small for destination format.#P Value cannot be represented exactly in destination format.Protected Mode Exceptions#NM#MFEM or TS in CR0 is set.If there is a pending x87 FPU exception.Real-Address Mode Exceptions#NM#MFEM or TS in CR0 is set.If there is a pending x87 FPU exception.Virtual-8086 Mode Exceptions#NM#MFEM or TS in CR0 is set.If there is a pending x87 FPU exception.Compatibility Mode ExceptionsSame as for protected mode exceptions.<strong>64</strong>-Bit Mode ExceptionsSame as for protected mode exceptions.2-160 Vol. 1

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