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C COMPILER->In-Line Assembler Code->Function Return Value

The D0 data register contains the return value for functions that return an integral value.

Unless you have used either the /NO68881 or /CPU32 option, the FP0 68881 register contains the return value for functions that return a floating point value.

If you have used either the /NO68881 or /CPU32 option, the return value for floating point functions is placed (high byte first in IEEE format) at the address __CW68D002.  This is a reserved data space 12 bytes wide.  Float return values are located at __CW68D002+8, double return values are located at __CW68D002+4 and long double return values are located at __CW68D002.