Re: i386 and x86-64 bitops function prototypes differ
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Fri, 26 Jan 2007 09:49:54 -0800
Stephane Eranian wrote:
Hello,
I ran into compiler warnings with the perfmon code when I tried
using test() and __set_bit() on i386.
For some reason, the i386 bitops functions use unsigned long * for
the address whereas x86-64/ia64 use void *.
I do not quite understand why such difference?
Is this just for historical reasons?
Thanks.
Arguably void * is the right thing for a littleendian architecture. For bigendian architectures it unfortunately matters what the chunk size is, regardless of if the chunks are numbered in bigendian (reverse) or littleendian (forward) order.
-hpa
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