Messages in this thread | | | Date | Mon, 28 Apr 2008 18:47:50 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH] bitops: simplify generic bit finding functions |
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On Mon, 28 Apr 2008, Linus Torvalds wrote: > > > > How about making the optimization controlled by a config switch so > > arch maintainers can decide whether they want to enable the constant > > optimization or unconditionally call the lib function ? > > No. > > This is just making that damn header line look worse and worse. > > Is there a _reason_ to optimize this stupid function this way?
On architectures which have a find bit instruction we can replace the call to the library function by a single instruction when the size of the bitmap is less/equal bits per long and when the bitnr is a constant.
Thanks, tglx
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