Hello all, The GCC 4.4.0 internal says : [Macro] CALL_REALLY_USED_REGISTERS Like CALL_USED_REGISTERS except this macro doesn’t require that the entire set of FIXED_REGISTERS be included. (CALL_USED_REGISTERS must be a superset of FIXED_ REGISTERS). This macro is optional. If not specifed, it defaults to the value of CALL_USED_REGISTERS.
But it doesn't say why one needs to use this. What is the need for the macro CALL_REALLY_USED_REGISTERS when compared to CALL_USED_REGISTERS? regards, Shafi
