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Vol. 2A 3-311
INSTRUCTION SET REFERENCE, A-M
FCOMI/FCOMIP/ FUCOMI/FUCOMIP—Compare Floating Point Values and Set EFLAGS
ZF, PF, CF ← 111;
FI;
FI;
FI;
IF Instruction is FCOMIP or FUCOMIP
THEN
PopRegisterStack;
FI;
FPU Flags Affected
C1 Set to 0 if stack underflow occurred; otherwise, set to 0.
C0, C2, C3 Not affected.
Floating-Point Exceptions
#IS Stack underflow occurred.
#IA (FCOMI or FCOMIP instruction) One or both operands are NaN
values or have unsupported formats.
(FUCOMI or FUCOMIP instruction) One or both operands are
SNaN values (but not QNaNs) or have undefined formats.
Detection of a QNaN value does not raise an invalid-operand
exception.
Protected Mode Exceptions
#NM CR0.EM[bit 2] or CR0.TS[bit 3] = 1.
#MF If there is a pending x87 FPU exception.
#UD If the LOCK prefix is used.
Real-Address Mode Exceptions
Same exceptions as in protected mode.
Virtual-8086 Mode Exceptions
Same exceptions as in protected mode.
Compatibility Mode Exceptions
Same exceptions as in protected mode.
64-Bit Mode Exceptions
Same exceptions as in protected mode.