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$ perl createblinker.pl 500000 -900000 100 >x.tmp 2>y.tmp

$ /opt/perl-5.24.2/bin/perl -I. tbench1.pl x.tmp 2
cell count at start = 1500000
...
cell count at end = 1500000
time taken: 42 secs

$ /opt/cperl-5.24.3c/bin/cperl -I. tbench1.pl x.tmp 2
cell count at start = 1500000
...
cell count at end = 675003  <-- incorrect
time taken: 34 secs

./Configure -Dprefix=/opt/cperl-5.24.3c -sder -Dusethreads -Dusecperl 
+-Accflags=-msse4.2

./Configure -Dprefix=/opt/cperl-5.26.1c -sder -Dusethreads -Dusecperl 
+-Accflags=-msse4.2