Interlanguage Calls - Function Return Values
Functions pass their return values according to type:
- Pointers, enumerated types, and integral values (int, short,
long, char, and unsigned types) of any length are
returned, right-justified, in R3; long long values are returned in R3 and
R4. (R3 in 64-bit mode)
- floats and doubles are returned in FP1; 128-bit long
doubles are returned in FP1 and FP2.
- Calling functions supply a pointer to a memory location where the called function stores
the returned value.
- long doubles are returned in R1 and R2.
Interlanguage Calling Conventions
Corresponding Data Types
Use the Subroutine Linkage Conventions in Interlanguage Calls
Sample Program: C Calling Fortran