Matt Pharr 71317e6aa6 Fix bug in gather/scatter optimization passes. ...

When flattening chains of insertelement instructions, we didn't
handle the case where the initial insertelement was to a constant
vector (with one value set and the other values undef).

Also generalized the "do all of the instances access the same location"
check to handle the case where some of them are accessing undef
locations; these are ignored in this check, as they should correspond to the
mask being off for that lane anyway.

Fixes issue #149.

2012-01-06 09:19:18 -08:00

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