On most processors <<2 is slower than *4. It's outright stupid to
write <<2 when we mean *4 in order to optimize for one out of a
gazillion supported architectures - even more so when the compiler
for the one CPU where <<2 is faster, will actually generate a shift
instead of a multiply as a part of the standard optimization.
One question for the GCC people: Will gcc change <<2 to *4 on other
architectures ? If so, then my case is not quite as strong of course.
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