Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=22b9a0a3a49ab1a856e0853b3f3dd2abd156bd7c
Commit: 22b9a0a3a49ab1a856e0853b3f3dd2abd156bd7c
Parent: c454673da7c1d6533f40ec2f788023df9af56ebf
Author: Stephen Hemminger <[EMAIL PROTECTED]>
AuthorDate: Thu Mar 22 12:10:18 2007 -0700
Committer: David S. Miller <[EMAIL PROTECTED]>
CommitDate: Wed Apr 25 22:27:18 2007 -0700
[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 <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
---
lib/div64.c | 16 +++++++---------
1 files changed, 7 insertions(+), 9 deletions(-)
diff --git a/lib/div64.c b/lib/div64.c
index c3d7655..74f0c8c 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;
}
-
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