From 22b9a0a3a49ab1a856e0853b3f3dd2abd156bd7c Mon Sep 17 00:00:00 2001 From: Stephen Hemminger Date: Thu, 22 Mar 2007 12:10:18 -0700 Subject: [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 Signed-off-by: David S. Miller --- lib/div64.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) (limited to 'lib') diff --git a/lib/div64.c b/lib/div64.c index c3d7655cdfb5..74f0c8cb4031 100644 --- a/lib/div64.c +++ b/lib/div64.c @@ -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; + do_div(dividend, d); return dividend; } -- cgit v1.2.3