On 12/30/2015 10:03 PM, Haozhong Zhang wrote:
This patch adds several functions to take multiplication, division and
shifting involving 64-bit integers. Those functions are derived from
Linux kernel and will be used by later patches to calculate scaling
ratio and scaled TSC.
Signed-off-by: Haozhong Zhang <haozhong.zh...@intel.com>
Reviewed-by: Boris Ostrovsky <boris.ostrov...@oracle.com>
(although I not sure why you decided to change Linux' code in mul64() below)
+ c = (u64)rl.l.high + rm.l.low + rn.l.low;
+ rl.l.high = c;
+ c >>= 32;
+ c = c + rm.l.high + rn.l.high + rh.l.low;
+ rh.l.low = c;
+ rh.l.high += (u32)(c >> 32);
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