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CALL_USED_REGISTERS vs CALL_REALLY_USED_REGISTERS


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


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