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When using the stack-based calling conventions with "fpi" or "fpi87",
floating-point values are returned in registers.  Single precision values
are returned in EAX, and double precision values are returned in EDX:EAX.

When using the register-based calling conventions with "fpi" or "fpi87",
floating-point values are returned in ST(0).  All other values are returned
in the manner described earlier in this chapter.

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