Make a copy of strip mined loops with small number of iterations from profiling

Roland Westrelin rwestrel at
Fri Mar 3 14:56:35 UTC 2017

Here is a somewhat experimental patch: when profiling indicates a strip
mined loop doesn't run for many iterations on average, a copy of the
loop is made without the outer loop. A test is compiled in the code to
switch between the short version and the full blow strip mined loop
based on the number of actual iterations.


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