[klibc] Re: long long on 32-bit machines

Paul Mackerras paulus at samba.org
Thu Jan 29 22:02:42 PST 2004

H. Peter Anvin writes:

> Does anyone happen to know if there are *any* 32-bit architectures (on 
> which Linux runs) for which the ABI for a "long long" is different from 
> passing two "longs" in the appropriate order, i.e. (hi,lo) for bigendian 
> or (lo,hi) for littleendian?

Are you are talking about passing arguments to a function?  PPC32
passes long long arguments in two registers in the order you would
expect (hi, lo), BUT you have to use an odd/even register pair.  In
other words, if you have a function like this:

	int foo(int a, long long b)

then a will be passed in r3 and b will be passed in r5 and r6, and r4
will be unused.


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