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(nasm.info)Section B.4.92

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B.4.92. `FMUL', `FMULP': Floating-Point Multiply
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     FMUL mem32                    ; D8 /1                [8086,FPU]
     FMUL mem64                    ; DC /1                [8086,FPU]

     FMUL fpureg                   ; D8 C8+r              [8086,FPU]
     FMUL ST0,fpureg               ; D8 C8+r              [8086,FPU]

     FMUL TO fpureg                ; DC C8+r              [8086,FPU]
     FMUL fpureg,ST0               ; DC C8+r              [8086,FPU]

     FMULP fpureg                  ; DE C8+r              [8086,FPU]
     FMULP fpureg,ST0              ; DE C8+r              [8086,FPU]

   `FMUL' multiplies `ST0' by the given operand, and stores the result
in `ST0', unless the `TO' qualifier is used in which case it stores the
result in the operand. `FMULP' performs the same operation as `FMUL
TO', and then pops the register stack.