Re: [PATCH 2/5] bitops: compile time optimization forhweight_long(CONSTANT)

[Peter Zijlstra]

On Wed, 2010-02-03 at 07:08 -0800, Andrew Morton wrote:
> On Wed, 3 Feb 2010 21:39:51 +0800 Wu Fengguang <fengguang.wu@xxxxxxxxx> wrote:
> 
> > Is there an official lowest GCC version that Linux supports?
> 
> Documentation/Changes says gcc-3.2.

Anyway, its not like that macro I used isn't straight forward. Not much
a builtin can do better.

The only benefit the builtin has is possibly use machine popcnt
instructions but we already deal with that in the kernel.



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