From 02a59232513240899da538380010accf3d24f687 Mon Sep 17 00:00:00 2001 From: Stefano Stabellini Date: Mon, 23 Jan 2012 09:40:35 +0000 Subject: [PATCH] xen: implement an signed 64 bit division helper function 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 Committed-by: Keir Fraser --- xen/common/lib.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/xen/common/lib.c b/xen/common/lib.c index 4ae637c478..e9d0637b68 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 = ABS(a); + ub = ABS(b); + 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 */ -- 2.30.2