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SubjectRe: [PATCH 2/5] bitops: compile time optimization for hweight_long(CONSTANT)
On Thu, Feb 18, 2010 at 11:51:50AM +0100, Peter Zijlstra wrote:
> I guess one way to achieve that is to create a arch/x86/lib/hweight.c
> that includes lib/hweight.c and give the x86 one special compile flags
> and not build the lib on.

That's what I thought initially too but that won't fly because the
lib/hweight.c helpers have to be inlined into arch/x86/lib/hweight.c so
that gcc can take care of the clobbered registers. Otherwise, it just a
"call __sw_hweightXX" that gets issued into asm.


Advanced Micro Devices, Inc.
Operating Systems Research Center

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