Assembler:Commands:COMISS

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command comiss operand1, operand2

Compares the single-precision floating-point (single-fp) value in the low doubleword of the first operand with the single-fp value in the low doubleword of the second operand and sets the status flags in the (E)FLAGS register.

The CF, ZF and PF flags are set according to the result (unordered, greater than, less than, or equal). The OF, SF and AF flags are set to 0.


Command Parameters[edit]

Parameter Description
operand1 The first operand to compare. Must be a XMM register.
operand2 The second operand to compare. May be an XMM register or a 32 bit memory location

Resulting Flag State[edit]

Parameters ZF PF CF
operand1 < operand2 0 0 1
operand1 = operand2 1 0 0
operand1 > operand2 0 0 0
unordered 1 1 1

The unordered result is returned if either source operand is a NaN (QNaN or SNaN). The OF, SF and AF flags are set to 0.

Examples[edit]

comiss xmm2,xmm5
comiss xmm2,[eax]
comiss xmm0,[00123ABC]

See also[edit]

External links[edit]