Messages in this thread | | | Date | Fri, 18 Aug 2006 08:39:12 +0000 | From | Pavel Machek <> | Subject | Re: [RHEL5 PATCH 1/4] Provide fallback full 64-bit divide/modulus ops for gcc |
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On Tue 15-08-06 09:29:57, David Howells wrote: > Andi Kleen <ak@suse.de> wrote: > > > At least Linus' traditional argument against this is that it's better > > to open code these (do_div) so that it's clear to the coder that they > > are really costly. > > do_div() is not a full replacement for __udivdi3(), __umoddi3() or > __udivmoddi4(), though I suspect we don't need divisor >= 2^32 anywhere atm. > > There are places where the compiler emits these that aren't entirely obvious, > one of which IIRC is in ext2 inode allocation.
Well -- but that is good reason to keep that open-coded, right?
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