John-Mark Gurney j...@funkthat.com writes:
So this says that you think it should be using the builtin, yet when I
suggested it, you say no? Which is it?
Use ffs(), let libkern worry about how it's implemented.
DES
--
Dag-Erling Smørgrav - d...@des.no
On 12/05/14 10:33, Dag-Erling Smørgrav wrote:
John-Mark Gurney j...@funkthat.com writes:
So this says that you think it should be using the builtin, yet when I
suggested it, you say no? Which is it?
Use ffs(), let libkern worry about how it's implemented.
DES
Hi,
One more question. Is
Hans Petter Selasky h...@selasky.org writes:
Is ffs() available in the loader too? Because this code is also built
for the loader? I guess I could figure this out myself though ...
The loader usues libkern, so yes. But it's easy enough to check - just
modify the code to use ffs() and see if it
Hans Petter Selasky h...@selasky.org writes:
I see. Who can update the cpufunc.h header file to use the builtins?
Ask someone involved with porting FreeBSD to that platform.
Are these also available with GCC?
They are enabled unconditionally for amd64 and i386. They may or may
not be
Done.
See r275507 .
--HPS
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On 04 Dec 2014, at 01:54, John-Mark Gurney j...@funkthat.com wrote:
Hans Petter Selasky wrote this message on Wed, Dec 03, 2014 at 21:55 +:
Author: hselasky
Date: Wed Dec 3 21:55:44 2014
New Revision: 275468
URL: https://svnweb.freebsd.org/changeset/base/275468
Log:
Optimise the
Dimitry Andric d...@freebsd.org writes:
Maybe it is easier to alias ffs() and friends to __builtin_ffs(),
since the compilers we support have these builtins already.
That should already be the case on platforms that support it. There is
absolutely no reason to hand-roll an ffs() equivalent.
Hans Petter Selasky wrote this message on Thu, Dec 04, 2014 at 08:21 +0100:
On 12/04/14 01:54, John-Mark Gurney wrote:
Hans Petter Selasky wrote this message on Wed, Dec 03, 2014 at 21:55 +:
Author: hselasky
Date: Wed Dec 3 21:55:44 2014
New Revision: 275468
URL:
John-Mark Gurney j...@funkthat.com writes:
Did you see the comment about usig __builtin_ffs{,l,ll} instead? this
seems to be a better route...
No. It's needlessly compiler-dependent.
So, how about changing libkern.h to define the various ones to the
built in, and dropping all the special
Dag-Erling Smrgrav wrote this message on Thu, Dec 04, 2014 at 19:28 +0100:
John-Mark Gurney j...@funkthat.com writes:
Did you see the comment about usig __builtin_ffs{,l,ll} instead? this
seems to be a better route...
No. It's needlessly compiler-dependent.
I'm confused, in an earlier
On 12/04/14 18:50, John-Mark Gurney wrote:
Hans Petter Selasky wrote this message on Thu, Dec 04, 2014 at 08:21 +0100:
On 12/04/14 01:54, John-Mark Gurney wrote:
Hans Petter Selasky wrote this message on Wed, Dec 03, 2014 at 21:55 +:
Author: hselasky
Date: Wed Dec 3 21:55:44 2014
New
Author: hselasky
Date: Wed Dec 3 21:55:44 2014
New Revision: 275468
URL: https://svnweb.freebsd.org/changeset/base/275468
Log:
Optimise the bit searching loops, by quickly skipping the 16 first set
bits if all the 16 first bits are set. This way the worst case
searching time is reduced
Hans Petter Selasky wrote this message on Wed, Dec 03, 2014 at 21:55 +:
Author: hselasky
Date: Wed Dec 3 21:55:44 2014
New Revision: 275468
URL: https://svnweb.freebsd.org/changeset/base/275468
Log:
Optimise the bit searching loops, by quickly skipping the 16 first set
bits if
On 12/04/14 01:54, John-Mark Gurney wrote:
Hans Petter Selasky wrote this message on Wed, Dec 03, 2014 at 21:55 +:
Author: hselasky
Date: Wed Dec 3 21:55:44 2014
New Revision: 275468
URL: https://svnweb.freebsd.org/changeset/base/275468
Log:
Optimise the bit searching loops, by quickly
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