RFC: vectorizer cost model
Tue Feb 20 18:10:00 GMT 2007
>> * How do we compare the costs of if-converted vectorized code to
>> it's scalar counterpart?
o It may be convenient to calculate scalar cost during if-conversion itself.
o It is possible that size of two sibling blocks (Block_A & Block_B)
does not match at the beginning of tree-ssa level if conversion.
As a first step, to stay on conservative side, it makes sense
consider the scalar cost of smaller block while calculating scalar cost.
Note, smaller block may not exist.
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