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Intel® Extended Memory 64 Technology Software Developer's Guide

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FABS—Absolute ValueOpcode Instruction <strong>64</strong>-Bit Mode Compat/Leg DescriptionModeD9 E1 FABS Valid Valid Replace ST with its absolute value.FPU Flags AffectedC1 Set to 0 if stack underflow occurred; otherwise, cleared to 0.C0, C2, C3 Undefined.IA-32e Mode OperationSame as legacy mode.Floating-Point Exceptions#ISStack underflow occurred.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.Vol. 1 2-161

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