[lkml]   [2017]   [Nov]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] lib: Avoid redundant sizeof checking in __bitmap_weight() calculation.
On Tue, Nov 14, 2017 at 1:23 PM, Rasmus Villemoes
<> wrote:
> hint: sizeof() very rarely evaluates to zero... So this is the same as
> "is32 = 1". So the patch as-is is broken (and may explain the 1-byte
> delta in vmlinux). But even if this condition is fixed, the patch
> doesn't change anything, since the sizeof() evaluation is done at
> compile-time, regardless of whether it happens inside the inlined
> hweight_long or outside. So it is certainly not worth it to duplicate
> the loop.
Right, no need to duplicate the loop. Checking the objdump output, it
didn't changed anything at all. Fixed condition nullifies the vmlinux
size advantage also. Drop it.


 \ /
  Last update: 2017-11-14 09:59    [W:0.043 / U:0.276 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site