14.7.2 Return Value

Function return values are returned in registers whenever possible. For dsPIC33A, floating point type variables are returned in F registers, otherwise all return values are in W registers. The following chart should help decipher where to place, or look for, return values.


Return kind	Architecture	Location
8-bit integer	All	W0
16-bit integer	All	W0
32-bit integer	dsPIC33C/E/F and dsPIC30F	W1:W0
32-bit integer	dsPIC33A	W0
64-bit integer	dsPIC33C/E/F and dsPIC30F	W3:W2:W1:W0
64-bit integer	dsPIC33A	W1:W0
32-bit float	dsPIC33C/E/F and dsPIC30F	W1:W0
32-bit float	dsPIC33A	F0
64-bit float	dsPIC33C/E/F and dsPIC30F	W3:W2:W1:W0
64-bit float	dsPIC33A	F1:F0
struct	All	Indirectly through storage pointed to in W0