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[LIB]: div64_64 optimization 

Minor optimization of div64_64.  do_div() already does optimization
for the case of 32 by 32 divide, so no need to do it here.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stephen Hemminger 2007-03-22 12:10:18 -07:00 committed by David S. Miller
parent c454673da7
commit 22b9a0a3a4
1 changed files with 7 additions and 9 deletions
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16
lib/div64.c
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@ -61,20 +61,18 @@ EXPORT_SYMBOL(__div64_32);
/* 64bit divisor, dividend and result. dynamic precision */ /* 64bit divisor, dividend and result. dynamic precision */
uint64_t div64_64(uint64_t dividend, uint64_t divisor) uint64_t div64_64(uint64_t dividend, uint64_t divisor)
{ {
uint32_t d = divisor; uint32_t high, d;
if (divisor > 0xffffffffULL) { high = divisor >> 32;
unsigned int shift = fls(divisor >> 32); if (high) {
unsigned int shift = fls(high);
d = divisor >> shift; d = divisor >> shift;
dividend >>= shift; dividend >>= shift;
} } else
d = divisor;
/* avoid 64 bit division if possible */ do_div(dividend, d);
if (dividend >> 32)
do_div(dividend, d);
else
dividend = (uint32_t) dividend / d;
return dividend; return dividend;
} }