On Tue, Feb 03, 2015 at 03:17:30AM +0200, Kirill A. Shutemov wrote:
> Results for 10 runs on my laptop -- i5-3427U (IvyBridge 1.8 Ghz, 2.8Ghz Turbo
> with 3MB LLC):

I've screwed up the inner loop condition and step. As result the benchmark
touches the same cache line 8 times and scan SIZE/8 of memory. Fixed test
is in attach.
				Avg		Stddev
baseline			14.0663		0.0182
-DCHECK_BEFORE_SET		13.8594		0.0458
-DCACHE_HOT			12.3896		0.0867
-DCACHE_HOT -DCHECK_BEFORE_SET	11.7480		0.2497

And now it's faster *with* the check. Sometimes CPU is just too clever. ;)

-- 
 Kirill A. Shutemov