x86 Opcode FCOMI

Opcode FCOMI

CPU: P6
Type of Instruction: User

Instruction: FuCOMIp ST0,STi

Description:

CASE ( result (compare(ST0,STi) ) OF
{ ; ZF PF CF
Not Comparable: 1 1 1
ST0 > STi : 0 0 0
ST0 < STi : 0 0 1
ST0 = STi : 1 0 0
}

CASE ( FP_stack_status ) OF
{ ; SF
Overflow : 1
Underflow : 0
Otherwize : 0
}

CASE ( instruction ) OF
{
FCOMI,FUCOMI : No FP stack adjustment;
FCOMIP,FUCOMIP : POP ST;
}

Flags Affected: Int: CF,ZF,PF,SF
Fp : None

Note: In any case Sign of zero Ignored , so +0.0 = -0.0

CPU mode: RM,PM,VM,SMM

+++++++++++++++++++++++
Physical Form & COPs:

FCOMI ST0,STi DB F0+i
FCOMIP ST0,STi DF F0+i
FUCOMI ST0,STi DB E8+i
FUCOMIP ST0,STi DF E8+i

Clocks: N/A