CONST_CALL_P questions

[John Wehle]

1) What's an example declaration and usage of a const call function?
   I've been trying unsuccessfully to produce a sample which shows
   up in a RTL dump.

2) If the INSN has CONST_CALL_P set then does that mean the call
   has no possible side effects (not even in the parameters passed
   to the call)?  For example the parameters don't have PRE_DEC register
   notes, volatile memory references, etc. and that the function doesn't
   write to memory, modify global registers, reference volatile memory,
   etc.

The documentation (a.k.a. the source :-) wasn't completely clear to me
on these issues.

-- John
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