Matt Pharr ada66b5313 Make more attempts to pull out constant offsets for gather/scatter. ...

The "base+offsets" variants of gather decompose the integer offsets into
compile-time constant and compile-time unknown elements.  (The coalescing
optimization, then, depends on this decomposition being done well--having
as much as possible in the constant component.)  We now make multiple
efforts to improve this decomposition as we run optimization passes; in
some cases we're able to move more over to the constant side than was
first possible.

This in particular fixes issue #276, a case where coalescing was expected
but didn't actually happen.

2012-06-12 16:21:14 -07:00

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