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Commit 22b9a0a3 authored by Stephen Hemminger's avatar Stephen Hemminger Committed by David S. Miller
Browse files

[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: default avatarStephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c454673d

lib/div64.c

+7 −9
Original line number Diff line number Diff line
@@ -61,20 +61,18 @@ EXPORT_SYMBOL(__div64_32); 
/* 64bit divisor, dividend and result. dynamic precision */

uint64_t div64_64(uint64_t dividend, uint64_t divisor)

{

	uint32_t d = divisor;

	uint32_t high, d;



	if (divisor > 0xffffffffULL) {

		unsigned int shift = fls(divisor >> 32);

	high = divisor >> 32;

	if (high) {

		unsigned int shift = fls(high);



		d = divisor >> shift;

		dividend >>= shift;

	}

	} else

		d = divisor;



	/* avoid 64 bit division if possible */

	if (dividend >> 32)

	do_div(dividend, d);

	else

		dividend = (uint32_t) dividend / d;



	return dividend;

}