Matt Pharr 4388338dad Fix performance regression introduced in be0c77d556 ...

Effectively, the patterns that detected when given a gather or
scatter in base+offsets form, the offsets were actually a multiple
of 2/4/8, were no longer working.

This change not only fixes this, but also expands the set of
patterns that are matched by this.  For example, given offsets of
the form 4*v1 + 16*v2, it identifies a scale of 4 and new offsets
of v1 + 4*v2.

This fix makes the volume renderer run 1.19x faster, and noise 1.54x
faster.

2012-01-19 17:57:59 -08:00

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