[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH v3 04/25] xen: implement an signed 64 bit division helper function
>>> On 15.12.11 at 17:30, <stefano.stabellini@xxxxxxxxxxxxx> wrote: > From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> > > Implement a C function to perform 64 bit signed division and return both > quotient and remainder. > Useful as an helper function to implement __aeabi_ldivmod. > > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx> > --- > xen/common/lib.c | 19 +++++++++++++++++++ > 1 files changed, 19 insertions(+), 0 deletions(-) > > diff --git a/xen/common/lib.c b/xen/common/lib.c > index 4ae637c..fe831a3 100644 > --- a/xen/common/lib.c > +++ b/xen/common/lib.c > @@ -399,6 +399,25 @@ s64 __moddi3(s64 a, s64 b) > return (neg ? -urem : urem); > } > > +/* > + * Quotient and remainder of unsigned long long division > + */ > +s64 __ldivmod_helper(s64 a, s64 b, s64 *r) > +{ > + u64 ua, ub, rem, quot; > + > + ua = (a < 0) ? -(u64)a : a; > + ub = (b < 0) ? -(u64)b : b; ABS() in both cases? Jan > + quot = __qdivrem(ua, ub, &rem); > + if ( a < 0 ) > + *r = -rem; > + else > + *r = rem; > + if ( (a < 0) ^ (b < 0) ) > + return -quot; > + else > + return quot; > +} > #endif /* BITS_PER_LONG == 32 */ > > /* Compute with 96 bit intermediate result: (a*b)/c */ > -- > 1.7.2.5 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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