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(nasm.info)Section B.4.68

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B.4.68. `FADD', `FADDP': Floating-Point Addition
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     FADD mem32                    ; D8 /0                [8086,FPU]
     FADD mem64                    ; DC /0                [8086,FPU]

     FADD fpureg                   ; D8 C0+r              [8086,FPU]
     FADD ST0,fpureg               ; D8 C0+r              [8086,FPU]

     FADD TO fpureg                ; DC C0+r              [8086,FPU]
     FADD fpureg,ST0               ; DC C0+r              [8086,FPU]

     FADDP fpureg                  ; DE C0+r              [8086,FPU]
     FADDP fpureg,ST0              ; DE C0+r              [8086,FPU]

   * `FADD', given one operand, adds the operand to `ST0' and stores
     the result back in `ST0'. If the operand has the `TO' modifier,
     the result is stored in the register given rather than in `ST0'.

   * `FADDP' performs the same function as `FADD TO', but pops the
     register stack after storing the result.

   The given two-operand forms are synonyms for the one-operand forms.

   To add an integer value to `ST0', use the c{FIADD} instruction
(*Note Section B.4.80::)